diff --git a/backend/native/workspace-fs-at/binding.gyp b/backend/native/workspace-fs-at/binding.gyp
new file mode 100644
index 00000000..f98bfb8a
--- /dev/null
+++ b/backend/native/workspace-fs-at/binding.gyp
@@ -0,0 +1 @@
+{ "targets": [{ "target_name": "workspace_fs_at", "sources": ["workspace_fs_at.cc"], "cflags_cc": ["-std=c++17"], "defines": ["NAPI_VERSION=8"] }] }
\ No newline at end of file
diff --git a/backend/native/workspace-fs-at/workspace_fs_at.cc b/backend/native/workspace-fs-at/workspace_fs_at.cc
new file mode 100644
index 00000000..28e3acc6
--- /dev/null
+++ b/backend/native/workspace-fs-at/workspace_fs_at.cc
@@ -0,0 +1,27 @@
+#include <node_api.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <string>
+#include <stdint.h>
+#ifdef __APPLE__
+#include <sys/types.h>
+#endif
+struct Handle { uint64_t magic; int fd; bool directory; bool closed; };
+static const uint64_t MAGIC=0x5448545746534154ULL;
+static void finalize(napi_env env, void* data, void*) { Handle* h=(Handle*)data; if(h && h->magic==MAGIC && !h->closed){::close(h->fd);h->closed=true;} delete h; }
+static bool getHandle(napi_env env,napi_value v,Handle** out){ void* p=nullptr; if(napi_get_value_external(env,v,&p)!=napi_ok||!p)return false; auto*h=(Handle*)p; if(h->magic!=MAGIC||h->closed)return false;*out=h;return true; }
+static napi_value error(napi_env env,const char* syscall,int e){ napi_value msg,err,code,sys; napi_create_string_utf8(env,strerror(e),NAPI_AUTO_LENGTH,&msg); napi_create_error(env,nullptr,msg,&err); napi_create_string_utf8(env,syscall,NAPI_AUTO_LENGTH,&sys); napi_set_named_property(env,err,"syscall",sys); napi_create_string_utf8(env,strerror(e),NAPI_AUTO_LENGTH,&code); napi_set_named_property(env,err,"code",code); napi_value en; napi_create_int32(env,e,&en); napi_set_named_property(env,err,"errno",en); return err; }
+static napi_value fail(napi_env env,const char*s,int e){ napi_value x=error(env,s,e); napi_throw(env,x); return nullptr; }
+static bool str(napi_env env,napi_value v,std::string& out){ size_t n; if(napi_get_value_string_utf8(env,v,nullptr,0,&n)!=napi_ok)return false; out.resize(n); napi_get_value_string_utf8(env,v,out.data(),n+1,&n);return true; }
+static napi_value statObj(napi_env env,const struct stat& st){ napi_value o,n; napi_create_object(env,&o); napi_create_bigint_uint64(env,(uint64_t)st.st_dev,&n); napi_set_named_property(env,o,"device",n); napi_create_bigint_uint64(env,(uint64_t)st.st_ino,&n); napi_set_named_property(env,o,"inode",n); napi_create_uint32(env,(uint32_t)st.st_mode,&n); napi_set_named_property(env,o,"mode",n); napi_create_uint32(env,(uint32_t)st.st_uid,&n); napi_set_named_property(env,o,"uid",n); napi_create_uint32(env,(uint32_t)st.st_gid,&n); napi_set_named_property(env,o,"gid",n); napi_create_bigint_uint64(env,(uint64_t)st.st_nlink,&n); napi_set_named_property(env,o,"nlink",n); return o; }
+static napi_value result(napi_env env,int fd,bool dir,const struct stat&st){ auto*h=new Handle{MAGIC,fd,dir,false}; napi_value e,o,s; napi_create_external(env,h,finalize,nullptr,&e); napi_create_object(env,&o); napi_set_named_property(env,o,"handle",e); s=statObj(env,st); napi_set_named_property(env,o,"openedStat",s); return o; }
+static napi_value openatFn(napi_env env,napi_callback_info info){ size_t argc=1; napi_value a[1]; if(napi_get_cb_info(env,info,&argc,a,nullptr,nullptr)!=napi_ok||argc!=1)return fail(env,"openat",EINVAL); napi_value pv,nv,kv,mv; if(napi_get_named_property(env,a[0],"parent",&pv)!=napi_ok||napi_get_named_property(env,a[0],"name",&nv)!=napi_ok||napi_get_named_property(env,a[0],"kind",&kv)!=napi_ok||napi_get_named_property(env,a[0],"createMode",&mv)!=napi_ok)return fail(env,"openat",EINVAL); std::string name,kind; if(!str(env,nv,name)||!str(env,kv,kind))return fail(env,"openat",EINVAL); int32_t mode; if(napi_get_value_int32(env,mv,&mode)!=napi_ok)return fail(env,"openat",EINVAL); bool root=name=="/"; if(!root&&(name.empty()||name.size()>255||name=="."||name==".."||name.find('/')!=std::string::npos||name.find('\0')!=std::string::npos))return fail(env,"openat",EINVAL); Handle*ph=nullptr; if(root){if(kind!="directory"||mode!=0)return fail(env,"openat",EINVAL);} else if(!getHandle(env,pv,&ph)||!ph->directory)return fail(env,"openat",EBADF); int fd; if(root)fd=::open("/",O_RDONLY|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW); else if(kind=="directory"&&mode==0)fd=::openat(ph->fd,name.c_str(),O_RDONLY|O_DIRECTORY|O_CLOEXEC|O_NOFOLLOW); else if(kind=="regular_lock"&&mode==0600)fd=::openat(ph->fd,name.c_str(),O_RDWR|O_CREAT|O_CLOEXEC|O_NOFOLLOW,0600); else return fail(env,"openat",EINVAL); if(fd<0)return fail(env,"openat",errno); struct stat st; if(::fstat(fd,&st)<0){int e=errno;::close(fd);return fail(env,"fstat",e);} if(kind=="directory"&&!S_ISDIR(st.st_mode)){::close(fd);return fail(env,"openat",ENOTDIR);} if(kind=="regular_lock"&&(!S_ISREG(st.st_mode)||(st.st_mode&0777)!=0600)){::close(fd);return fail(env,"openat",EPERM);} return result(env,fd,kind=="directory",st); }
+static napi_value mkdiratFn(napi_env env,napi_callback_info info){size_t n=3; napi_value a[3]; napi_get_cb_info(env,info,&n,a,nullptr,nullptr);Handle*h;std::string s;int32_t m;if(n!=3||!getHandle(env,a[0],&h)||!h->directory||!str(env,a[1],s)||napi_get_value_int32(env,a[2],&m)!=napi_ok||m!=0700)return fail(env,"mkdirat",EINVAL);if(s.empty()||s.size()>255||s=="."||s==".."||s.find('/')!=std::string::npos)return fail(env,"mkdirat",EINVAL);if(::mkdirat(h->fd,s.c_str(),0700)<0)return fail(env,"mkdirat",errno);return nullptr;}
+static napi_value fstatatFn(napi_env env,napi_callback_info info){size_t n=2;napi_value a[2];napi_get_cb_info(env,info,&n,a,nullptr,nullptr);Handle*h;std::string s;if(n!=2||!getHandle(env,a[0],&h)||!h->directory||!str(env,a[1],s)||s.empty()||s.size()>255||s=="."||s==".."||s.find('/')!=std::string::npos)return fail(env,"fstatat",EINVAL);struct stat st;if(::fstatat(h->fd,s.c_str(),&st,AT_SYMLINK_NOFOLLOW)<0)return fail(env,"fstatat",errno);return statObj(env,st);}
+static napi_value fsyncFn(napi_env env,napi_callback_info info){size_t n=1;napi_value a[1];napi_get_cb_info(env,info,&n,a,nullptr,nullptr);Handle*h;if(n!=1||!getHandle(env,a[0],&h)||!h->directory)return fail(env,"fsync",EBADF);if(::fsync(h->fd)<0)return fail(env,"fsync",errno);return nullptr;}
+static napi_value closeFn(napi_env env,napi_callback_info info){size_t n=1;napi_value a[1];napi_get_cb_info(env,info,&n,a,nullptr,nullptr);Handle*h;if(n!=1||!getHandle(env,a[0],&h))return fail(env,"close",EBADF);h->closed=true;int rc=::close(h->fd);if(rc<0)return fail(env,"close",errno);return nullptr;}
+static napi_value fdFn(napi_env env,napi_callback_info info){size_t n=1;napi_value a[1];napi_get_cb_info(env,info,&n,a,nullptr,nullptr);Handle*h;if(n!=1||!getHandle(env,a[0],&h))return fail(env,"fcntl",EBADF);napi_value x;napi_create_int32(env,h->fd,&x);return x;}
+static napi_value init(napi_env env,napi_value exports){napi_property_descriptor p[]={{"openat",0,openatFn,0,0,0,napi_default,0},{"mkdirat",0,mkdiratFn,0,0,0,napi_default,0},{"fstatat",0,fstatatFn,0,0,0,napi_default,0},{"fsyncDirectory",0,fsyncFn,0,0,0,napi_default,0},{"close",0,closeFn,0,0,0,napi_default,0},{"fdNumberForSynchronousBorrow",0,fdFn,0,0,0,napi_default,0}};napi_define_properties(env,exports,6,p);return exports;} NAPI_MODULE(NODE_GYP_MODULE_NAME,init)
diff --git a/backend/package-lock.json b/backend/package-lock.json
index dbc16ac6..75d9f570 100644
--- a/backend/package-lock.json
+++ b/backend/package-lock.json
@@ -5,11 +5,13 @@
   "packages": {
     "": {
       "name": "thothii-backend",
+      "hasInstallScript": true,
       "dependencies": {
         "@fastify/cors": "^11.2.0",
         "@fastify/multipart": "^9.4.0",
         "@types/pg": "^8.20.3",
         "fastify": "^5.0.0",
+        "fs-ext": "2.1.1",
         "pg": "^8.22.0",
         "yaml": "^2.9.0",
         "yauzl": "^3.4.0",
@@ -20,9 +22,13 @@
         "@types/node": "^22.0.0",
         "@types/yauzl": "^3.4.0",
         "@types/yazl": "^3.3.1",
+        "node-gyp": "11.2.0",
         "tsx": "^4.19.0",
         "typescript": "^5.6.0",
         "vitest": "^2.1.0"
+      },
+      "engines": {
+        "node": ">=22 <23"
       }
     },
     "node_modules/@esbuild/aix-ppc64": {
@@ -643,6 +649,37 @@
         "ipaddr.js": "^2.1.0"
       }
     },
+    "node_modules/@isaacs/cliui": {
+      "version": "8.0.2",
+      "resolved": "https://registry.npmjs.org/@isaacs/cliui/-/cliui-8.0.2.tgz",
+      "integrity": "sha512-O8jcjabXaleOG9DQ0+ARXWZBTfnP4WNAqzuiJK7ll44AmxGKv/J2M4TPjxjY3znBCfvBXFzucm1twdyFybFqEA==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "string-width": "^5.1.2",
+        "string-width-cjs": "npm:string-width@^4.2.0",
+        "strip-ansi": "^7.0.1",
+        "strip-ansi-cjs": "npm:strip-ansi@^6.0.1",
+        "wrap-ansi": "^8.1.0",
+        "wrap-ansi-cjs": "npm:wrap-ansi@^7.0.0"
+      },
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/@isaacs/fs-minipass": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/@isaacs/fs-minipass/-/fs-minipass-4.0.1.tgz",
+      "integrity": "sha512-wgm9Ehl2jpeqP3zw/7mo3kRHFp5MEDhqAdwy1fTGkHAwnkGOVsgpvQhL8B5n1qlb01jV3n/bI0ZfZp5lWA1k4w==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "minipass": "^7.0.4"
+      },
+      "engines": {
+        "node": ">=18.0.0"
+      }
+    },
     "node_modules/@jridgewell/sourcemap-codec": {
       "version": "1.5.5",
       "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.5.5.tgz",
@@ -650,12 +687,53 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@npmcli/agent": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/@npmcli/agent/-/agent-3.0.0.tgz",
+      "integrity": "sha512-S79NdEgDQd/NGCay6TCoVzXSj74skRZIKJcpJjC5lOq34SZzyI6MqtiiWoiVWoVrTcGjNeC4ipbh1VIHlpfF5Q==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "agent-base": "^7.1.0",
+        "http-proxy-agent": "^7.0.0",
+        "https-proxy-agent": "^7.0.1",
+        "lru-cache": "^10.0.1",
+        "socks-proxy-agent": "^8.0.3"
+      },
+      "engines": {
+        "node": "^18.17.0 || >=20.5.0"
+      }
+    },
+    "node_modules/@npmcli/fs": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/@npmcli/fs/-/fs-4.0.0.tgz",
+      "integrity": "sha512-/xGlezI6xfGO9NwuJlnwz/K14qD1kCSAGtacBHnGzeAIuJGazcp45KP5NuyARXoKb7cwulAGWVsbeSxdG/cb0Q==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "semver": "^7.3.5"
+      },
+      "engines": {
+        "node": "^18.17.0 || >=20.5.0"
+      }
+    },
     "node_modules/@pinojs/redact": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/@pinojs/redact/-/redact-0.4.0.tgz",
       "integrity": "sha512-k2ENnmBugE/rzQfEcdWHcCY+/FM3VLzH9cYEsbdsoqrvzAKRhUZeRNhAZvB8OitQJ1TBed3yqWtdjzS6wJKBwg==",
       "license": "MIT"
     },
+    "node_modules/@pkgjs/parseargs": {
+      "version": "0.11.0",
+      "resolved": "https://registry.npmjs.org/@pkgjs/parseargs/-/parseargs-0.11.0.tgz",
+      "integrity": "sha512-+1VkjdD0QBLPodGrJUeqarH8VAIvQODIbwh9XpP5Syisf7YoQgsJKPNFoqqLQlu+VQ/tVSshMR6loPMn8U+dPg==",
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "engines": {
+        "node": ">=14"
+      }
+    },
     "node_modules/@rollup/rollup-android-arm-eabi": {
       "version": "4.62.2",
       "resolved": "https://registry.npmjs.org/@rollup/rollup-android-arm-eabi/-/rollup-android-arm-eabi-4.62.2.tgz",
@@ -1166,12 +1244,32 @@
         "url": "https://opencollective.com/vitest"
       }
     },
+    "node_modules/abbrev": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-3.0.1.tgz",
+      "integrity": "sha512-AO2ac6pjRB3SJmGJo+v5/aK6Omggp6fsLrs6wN9bd35ulu4cCwaAU9+7ZhXjeqHVkaHThLuzH0nZr0YpCDhygg==",
+      "dev": true,
+      "license": "ISC",
+      "engines": {
+        "node": "^18.17.0 || >=20.5.0"
+      }
+    },
     "node_modules/abstract-logging": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/abstract-logging/-/abstract-logging-2.0.1.tgz",
       "integrity": "sha512-2BjRTZxTPvheOvGbBslFSYOUkr+SjPtOnrLP33f+VIWLzezQpZcqVg7ja3L4dBXmzzgwT+a029jRx5PCi3JuiA==",
       "license": "MIT"
     },
+    "node_modules/agent-base": {
+      "version": "7.1.4",
+      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-7.1.4.tgz",
+      "integrity": "sha512-MnA+YT8fwfJPgBx3m60MNqakm30XOkyIoH1y6huTQvC0PwZG7ki8NacLBcrPbNoo8vEZy7Jpuk7+jMO+CUovTQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 14"
+      }
+    },
     "node_modules/ajv": {
       "version": "8.20.0",
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-8.20.0.tgz",
@@ -1205,6 +1303,32 @@
         }
       }
     },
+    "node_modules/ansi-regex": {
+      "version": "6.2.2",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-6.2.2.tgz",
+      "integrity": "sha512-Bq3SmSpyFHaWjPk8If9yc6svM8c56dB5BAtW4Qbw5jHTwwXXcTLoRMkpDJp6VL0XzlWaCHTXrkFURMYmD0sLqg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-regex?sponsor=1"
+      }
+    },
+    "node_modules/ansi-styles": {
+      "version": "6.2.3",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-6.2.3.tgz",
+      "integrity": "sha512-4Dj6M28JB+oAH8kFkTLUo+a2jwOFkuqb3yucU0CANcRRUbxS0cP0nZYCGjcc3BNXwRIsUVmDGgzawme7zvJHvg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
     "node_modules/assertion-error": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-2.0.1.tgz",
@@ -1244,6 +1368,23 @@
         "fastq": "^1.17.1"
       }
     },
+    "node_modules/balanced-match": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
+      "integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/brace-expansion": {
+      "version": "2.1.4",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.1.4.tgz",
+      "integrity": "sha512-hGfVzPxthbf3+2yjg/RBs60cB0FhqBS/zvdV/4wn4/BmN0bNMMHPc4V/BbFieqf1TKAGGAHnY4eSjajCl0f2Xg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "balanced-match": "^1.0.0"
+      }
+    },
     "node_modules/buffer-crc32": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/buffer-crc32/-/buffer-crc32-1.0.0.tgz",
@@ -1263,6 +1404,30 @@
         "node": ">=8"
       }
     },
+    "node_modules/cacache": {
+      "version": "19.0.1",
+      "resolved": "https://registry.npmjs.org/cacache/-/cacache-19.0.1.tgz",
+      "integrity": "sha512-hdsUxulXCi5STId78vRVYEtDAjq99ICAUktLTeTYsLoTE6Z8dS0c8pWNCxwdrk9YfJeobDZc2Y186hD/5ZQgFQ==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "@npmcli/fs": "^4.0.0",
+        "fs-minipass": "^3.0.0",
+        "glob": "^10.2.2",
+        "lru-cache": "^10.0.1",
+        "minipass": "^7.0.3",
+        "minipass-collect": "^2.0.1",
+        "minipass-flush": "^1.0.5",
+        "minipass-pipeline": "^1.2.4",
+        "p-map": "^7.0.2",
+        "ssri": "^12.0.0",
+        "tar": "^7.4.3",
+        "unique-filename": "^4.0.0"
+      },
+      "engines": {
+        "node": "^18.17.0 || >=20.5.0"
+      }
+    },
     "node_modules/chai": {
       "version": "5.3.3",
       "resolved": "https://registry.npmjs.org/chai/-/chai-5.3.3.tgz",
@@ -1290,6 +1455,36 @@
         "node": ">= 16"
       }
     },
+    "node_modules/chownr": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/chownr/-/chownr-3.0.0.tgz",
+      "integrity": "sha512-+IxzY9BZOQd/XuYPRmrvEVjF/nqj5kgT4kEq7VofrDoM1MxoRjEWkrCC3EtLi59TVawxTAn+orJwFQcrqEN1+g==",
+      "dev": true,
+      "license": "BlueOak-1.0.0",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/color-convert": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-2.0.1.tgz",
+      "integrity": "sha512-RRECPsj7iu/xb5oKYcsFHSppFNnsj/52OVTRKb4zP5onXwVF3zVmmToNcOfGC+CRDpfK/U584fMg38ZHCaElKQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "color-name": "~1.1.4"
+      },
+      "engines": {
+        "node": ">=7.0.0"
+      }
+    },
+    "node_modules/color-name": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.4.tgz",
+      "integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/cookie": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/cookie/-/cookie-1.1.1.tgz",
@@ -1303,6 +1498,44 @@
         "url": "https://opencollective.com/express"
       }
     },
+    "node_modules/cross-spawn": {
+      "version": "7.0.6",
+      "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.6.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^5.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/strip-ansi": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-7.2.0.tgz",
+      "integrity": "sha512-yDPMNjp4WyfYBkHnjIRLfca1i6KMyGCtsVgoKe/z1+6vukgaENdgGBZt+ZmKPc4gavvEZ5OgHfHdrazhgNyG7w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^6.2.2"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/strip-ansi?sponsor=1"
+      }
+    },
+    "node_modules/strip-ansi-cjs": {
+      "name": "strip-ansi",
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+      "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^5.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/strip-ansi-cjs/node_modules/ansi-regex": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
+      "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/tar": {
+      "version": "7.5.22",
+      "resolved": "https://registry.npmjs.org/tar/-/tar-7.5.22.tgz",
+      "integrity": "sha512-MFO/QzvtAOmJbkhOaCTvbGcFN9L9b+JunIsDwaKljSOdcLMea3NJ1k9Usz/rjdfSXTq4dfzfeS7W4p4YOAAHeA==",
+      "dev": true,
+      "license": "BlueOak-1.0.0",
+      "dependencies": {
+        "@isaacs/fs-minipass": "^4.0.0",
+        "chownr": "^3.0.0",
+        "minipass": "^7.1.2",
+        "minizlib": "^3.1.0",
+        "yallist": "^5.0.0"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/thread-stream": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/thread-stream/-/thread-stream-4.2.0.tgz",
@@ -2160,6 +3205,23 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/tinyglobby": {
+      "version": "0.2.17",
+      "resolved": "https://registry.npmjs.org/tinyglobby/-/tinyglobby-0.2.17.tgz",
+      "integrity": "sha512-wXR/dYpcqKmfWpEdZjiKJOwCNFndD0DMnrW/cYjVGttEkBfVgcLFHoNrlj47mjOVic9yyNu65alsgF4NQyTa2g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "fdir": "^6.5.0",
+        "picomatch": "^4.0.4"
+      },
+      "engines": {
+        "node": ">=12.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/SuperchupuDev"
+      }
+    },
     "node_modules/tinypool": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/tinypool/-/tinypool-1.1.1.tgz",
@@ -2238,6 +3300,32 @@
       "integrity": "sha512-iwDZqg0QAGrg9Rav5H4n0M64c3mkR59cJ6wQp+7C4nI0gsmExaedaYLNO44eT4AtBBwjbTiGPMlt2Md0T9H9JQ==",
       "license": "MIT"
     },
+    "node_modules/unique-filename": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/unique-filename/-/unique-filename-4.0.0.tgz",
+      "integrity": "sha512-XSnEewXmQ+veP7xX2dS5Q4yZAvO40cBN2MWkJ7D/6sW4Dg6wYBNwM1Vrnz1FhH5AdeLIlUXRI9e28z1YZi71NQ==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "unique-slug": "^5.0.0"
+      },
+      "engines": {
+        "node": "^18.17.0 || >=20.5.0"
+      }
+    },
+    "node_modules/unique-slug": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/unique-slug/-/unique-slug-5.0.0.tgz",
+      "integrity": "sha512-9OdaqO5kwqR+1kVgHAhsp5vPNU0hnxRa26rBFNfNgM7M6pNtgzeBn3s/xbyCQL3dcjzOatcef6UUHpB/6MaETg==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "imurmurhash": "^0.1.4"
+      },
+      "engines": {
+        "node": "^18.17.0 || >=20.5.0"
+      }
+    },
     "node_modules/vite": {
       "version": "5.4.21",
       "resolved": "https://registry.npmjs.org/vite/-/vite-5.4.21.tgz",
@@ -2817,6 +3905,22 @@
         }
       }
     },
+    "node_modules/which": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/which/-/which-5.0.0.tgz",
+      "integrity": "sha512-JEdGzHwwkrbWoGOlIHqQ5gtprKGOenpDHpxE9zVR1bWbOtYRyPPHMe9FaP6x61CmNaTThSkb0DAJte5jD+DmzQ==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "isexe": "^3.1.1"
+      },
+      "bin": {
+        "node-which": "bin/which.js"
+      },
+      "engines": {
+        "node": "^18.17.0 || >=20.5.0"
+      }
+    },
     "node_modules/why-is-node-running": {
       "version": "2.3.0",
       "resolved": "https://registry.npmjs.org/why-is-node-running/-/why-is-node-running-2.3.0.tgz",
@@ -2834,6 +3938,104 @@
         "node": ">=8"
       }
     },
+    "node_modules/wrap-ansi": {
+      "version": "8.1.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-8.1.0.tgz",
+      "integrity": "sha512-si7QWI6zUMq56bESFvagtmzMdGOtoxfR+Sez11Mobfc7tm+VkUckk9bW2UeffTGVUbOksxmSw0AA2gs8g71NCQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-styles": "^6.1.0",
+        "string-width": "^5.0.1",
+        "strip-ansi": "^7.0.1"
+      },
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
+      }
+    },
+    "node_modules/wrap-ansi-cjs": {
+      "name": "wrap-ansi",
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
+      "integrity": "sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-styles": "^4.0.0",
+        "string-width": "^4.1.0",
+        "strip-ansi": "^6.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
+      }
+    },
+    "node_modules/wrap-ansi-cjs/node_modules/ansi-regex": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
+      "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/wrap-ansi-cjs/node_modules/ansi-styles": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
+      "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "color-convert": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
+    "node_modules/wrap-ansi-cjs/node_modules/emoji-regex": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-8.0.0.tgz",
+      "integrity": "sha512-MSjYzcWNOA0ewAHpz0MxpYFvwg6yjy1NG3xteoqz644VCo/RPgnr1/GGt+ic3iJTzQ8Eu3TdM14SawnVUmGE6A==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/wrap-ansi-cjs/node_modules/string-width": {
+      "version": "4.2.3",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+      "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "emoji-regex": "^8.0.0",
+        "is-fullwidth-code-point": "^3.0.0",
+        "strip-ansi": "^6.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/wrap-ansi-cjs/node_modules/strip-ansi": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+      "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-regex": "^5.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/xtend": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
@@ -2843,6 +4045,16 @@
         "node": ">=0.4"
       }
     },
+    "node_modules/yallist": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-5.0.0.tgz",
+      "integrity": "sha512-YgvUTfwqyc7UXVMrB+SImsVYSmTS8X/tSrtdNZMImM+n7+QTriRXyXim0mBrTXNeqzVF0KWGgHPeiyViFFrNDw==",
+      "dev": true,
+      "license": "BlueOak-1.0.0",
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/yaml": {
       "version": "2.9.0",
       "resolved": "https://registry.npmjs.org/yaml/-/yaml-2.9.0.tgz",
diff --git a/backend/package.json b/backend/package.json
index fb672e9c..88bf7535 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -7,7 +7,9 @@
     "prebuild": "node scripts/clean-dist.mjs",
     "build": "tsc -p tsconfig.json",
     "test": "vitest run",
-    "start": "node dist/server.js"
+    "start": "node dist/server.js",
+    "build:native": "node scripts/build-workspace-fs-at.mjs",
+    "postinstall": "npm run build:native"
   },
   "dependencies": {
     "@fastify/cors": "^11.2.0",
@@ -18,7 +20,8 @@
     "yaml": "^2.9.0",
     "yauzl": "^3.4.0",
     "yazl": "^3.3.1",
-    "zod": "^4.4.3"
+    "zod": "^4.4.3",
+    "fs-ext": "2.1.1"
   },
   "devDependencies": {
     "@types/node": "^22.0.0",
@@ -26,6 +29,10 @@
     "@types/yazl": "^3.3.1",
     "tsx": "^4.19.0",
     "typescript": "^5.6.0",
-    "vitest": "^2.1.0"
+    "vitest": "^2.1.0",
+    "node-gyp": "11.2.0"
+  },
+  "engines": {
+    "node": ">=22 <23"
   }
 }
diff --git a/backend/scripts/build-workspace-fs-at.mjs b/backend/scripts/build-workspace-fs-at.mjs
new file mode 100644
index 00000000..c90c7154
--- /dev/null
+++ b/backend/scripts/build-workspace-fs-at.mjs
@@ -0,0 +1,8 @@
+import { spawnSync } from "node:child_process";
+import { dirname, resolve } from "node:path";
+import { fileURLToPath } from "node:url";
+const root = resolve(dirname(fileURLToPath(import.meta.url)), "../native/workspace-fs-at");
+const npm = process.platform === "win32" ? "npm.cmd" : "npm";
+const result = spawnSync(npm, ["exec", "--", "node-gyp@11.2.0", "rebuild", "--offline"], { cwd: root, stdio: "inherit" });
+if (result.error) throw result.error;
+if (result.status !== 0) process.exit(result.status ?? 1);
diff --git a/backend/src/native/workspace-fs-at-binding.d.ts b/backend/src/native/workspace-fs-at-binding.d.ts
new file mode 100644
index 00000000..b515f825
--- /dev/null
+++ b/backend/src/native/workspace-fs-at-binding.d.ts
@@ -0,0 +1,7 @@
+declare const nativeWorkspaceFsAtHandleBrand: unique symbol;
+declare const nativeWorkspaceFsAtComponentBrand: unique symbol;
+export interface NativeWorkspaceFsAtHandleV1 { readonly [nativeWorkspaceFsAtHandleBrand]: true; }
+export type NativeWorkspaceFsAtComponentV1 = string & { readonly [nativeWorkspaceFsAtComponentBrand]: true };
+export interface NativeWorkspaceFsAtStatV1 { readonly device: bigint; readonly inode: bigint; readonly mode: number; readonly uid: number; readonly gid: number; readonly nlink: bigint; }
+export interface NativeWorkspaceFsAtOpenResultV1 { readonly handle: NativeWorkspaceFsAtHandleV1; readonly openedStat: NativeWorkspaceFsAtStatV1; }
+export interface WorkspaceFsAtBindingV1 { openat(input: { readonly parent: NativeWorkspaceFsAtHandleV1|null; readonly name: "/"|NativeWorkspaceFsAtComponentV1; readonly kind: "directory"|"regular_lock"; readonly createMode: 0|0o600 }): NativeWorkspaceFsAtOpenResultV1; mkdirat(parent: NativeWorkspaceFsAtHandleV1,name:NativeWorkspaceFsAtComponentV1,mode:0o700):void; fstatat(parent:NativeWorkspaceFsAtHandleV1,name:NativeWorkspaceFsAtComponentV1):NativeWorkspaceFsAtStatV1; fsyncDirectory(handle:NativeWorkspaceFsAtHandleV1):void; close(handle:NativeWorkspaceFsAtHandleV1):void; fdNumberForSynchronousBorrow(handle:NativeWorkspaceFsAtHandleV1):number; }
diff --git a/backend/src/workspaces/workspace-fs-at.ts b/backend/src/workspaces/workspace-fs-at.ts
new file mode 100644
index 00000000..22f7f1d1
--- /dev/null
+++ b/backend/src/workspaces/workspace-fs-at.ts
@@ -0,0 +1,29 @@
+import { createRequire } from "node:module";
+import type { WorkspaceFsAtBindingV1, NativeWorkspaceFsAtHandleV1, NativeWorkspaceFsAtStatV1 } from "../native/workspace-fs-at-binding.js";
+const require = createRequire(import.meta.url);
+const binding = require("../../native/workspace-fs-at/build/Release/workspace_fs_at.node") as WorkspaceFsAtBindingV1;
+export interface WorkspaceFsAtStatV1 extends NativeWorkspaceFsAtStatV1 {}
+export type LockFileName = "writer.lock" | "session-readers.lock";
+export type WorkspaceFlockKindV1 = "shared" | "exclusive";
+export type WorkspaceFlockWaitV1 = "blocking" | "nonblocking";
+function component(value:string): string { if (typeof value!=="string" || value.length===0 || value.length>255 || value!==value.trim() || value==='.' || value==='..' || value.includes('/') || value.includes('\0')) throw new Error("invalid path component"); return value; }
+function normalizeError(error: unknown): Error { if (error instanceof Error) return error; return new Error(String(error)); }
+class Owned {
+  protected live=true;
+  constructor(protected readonly raw: NativeWorkspaceFsAtHandleV1, readonly opened: WorkspaceFsAtStatV1) {}
+  stat(): WorkspaceFsAtStatV1 { if(!this.live) throw new Error("workspace descriptor is closed"); return this.opened; }
+  close(): void { if(!this.live)return; this.live=false; try { binding.close(this.raw); } catch(e){ throw normalizeError(e); } }
+  _raw(): NativeWorkspaceFsAtHandleV1 { if(!this.live) throw new Error("workspace descriptor is closed"); return this.raw; }
+}
+export class OwnedWorkspaceFsAtDirectory extends Owned { private constructor(raw:NativeWorkspaceFsAtHandleV1, stat:WorkspaceFsAtStatV1){super(raw,stat);} static from(raw:NativeWorkspaceFsAtHandleV1,stat:WorkspaceFsAtStatV1){return new OwnedWorkspaceFsAtDirectory(raw,stat);} }
+export class OwnedWorkspaceFsAtRegularFile extends Owned { private constructor(raw:NativeWorkspaceFsAtHandleV1, stat:WorkspaceFsAtStatV1){super(raw,stat);} static from(raw:NativeWorkspaceFsAtHandleV1,stat:WorkspaceFsAtStatV1){return new OwnedWorkspaceFsAtRegularFile(raw,stat);} }
+function rawDirectory(value:OwnedWorkspaceFsAtDirectory){ return value._raw(); }
+export class WorkspaceFsAtV1 {
+  openRoot(): OwnedWorkspaceFsAtDirectory { const r=binding.openat({parent:null,name:"/",kind:"directory",createMode:0}); return OwnedWorkspaceFsAtDirectory.from(r.handle,r.openedStat); }
+  openDirectoryAt(parent:OwnedWorkspaceFsAtDirectory, name:string):OwnedWorkspaceFsAtDirectory { const r=binding.openat({parent:rawDirectory(parent),name:component(name) as never,kind:"directory",createMode:0}); return OwnedWorkspaceFsAtDirectory.from(r.handle,r.openedStat); }
+  openOrCreateLockAt(parent:OwnedWorkspaceFsAtDirectory,name:LockFileName,mode:0o600):OwnedWorkspaceFsAtRegularFile { if(name!=="writer.lock"&&name!=="session-readers.lock"||mode!==0o600)throw new Error("invalid lock"); const r=binding.openat({parent:rawDirectory(parent),name:name as never,kind:"regular_lock",createMode:0o600}); return OwnedWorkspaceFsAtRegularFile.from(r.handle,r.openedStat); }
+  mkdirAt(parent:OwnedWorkspaceFsAtDirectory,name:string,mode:0o700):void { binding.mkdirat(rawDirectory(parent),component(name) as never,mode); }
+  statAtNoFollow(parent:OwnedWorkspaceFsAtDirectory,name:string):WorkspaceFsAtStatV1 { return binding.fstatat(rawDirectory(parent),component(name) as never); }
+  fsyncDirectory(directory:OwnedWorkspaceFsAtDirectory):void { binding.fsyncDirectory(rawDirectory(directory)); }
+  flockOwnedLock(owned:OwnedWorkspaceFsAtRegularFile,kind:WorkspaceFlockKindV1,wait:WorkspaceFlockWaitV1):void { const fd=binding.fdNumberForSynchronousBorrow(owned._raw()); const fsExt=require("fs-ext") as {flockSync(fd:number,operation:string):void}; const operation=kind==="shared"?(wait==="blocking"?"sh":"shnb"):(wait==="blocking"?"ex":"exnb"); fsExt.flockSync(fd,operation); }
+}
diff --git a/backend/src/workspaces/workspace-lock-root-lease.ts b/backend/src/workspaces/workspace-lock-root-lease.ts
new file mode 100644
index 00000000..81868d16
--- /dev/null
+++ b/backend/src/workspaces/workspace-lock-root-lease.ts
@@ -0,0 +1,32 @@
+import { WorkspaceFsAtV1, OwnedWorkspaceFsAtDirectory, type OwnedWorkspaceFsAtRegularFile, type WorkspaceFsAtStatV1 } from "./workspace-fs-at.js";
+export type CanonicalWorkspaceId = string & { readonly __workspaceId: unique symbol };
+export interface WorkspaceLockRootIdentityV1 { readonly schemaVersion:1; readonly workspaceId:CanonicalWorkspaceId; readonly device:bigint; readonly inode:bigint; }
+export class CanonicalWorkspaceLockRootInput { private constructor(readonly workspaceId:CanonicalWorkspaceId, readonly owner:symbol){} static make(id:CanonicalWorkspaceId,owner:symbol){return new CanonicalWorkspaceLockRootInput(id,owner);} }
+export class BorrowedVerifiedWorkspaceLockRootLease { private constructor(readonly identity:WorkspaceLockRootIdentityV1, private readonly check:()=>void){} static make(i:WorkspaceLockRootIdentityV1,c:()=>void){return new BorrowedVerifiedWorkspaceLockRootLease(i,c);} assertLive(){this.check();} }
+function conflict(message="preprocessing conflict"):Error { const e=new Error(message); e.name="PreprocessingConflictError"; return e; }
+function exactStat(stat:WorkspaceFsAtStatV1,uid:number):boolean { return (stat.mode&0o170000)===0o040000 && (stat.mode&0o777)===0o700 && stat.uid===uid && stat.nlink===1n; }
+export class WorkspaceSessionReadersLockLease {
+ private live=true; private constructor(private readonly lock:OwnedWorkspaceFsAtRegularFile, private readonly root:OwnedWorkspaceFsAtDirectory, readonly rootIdentity:WorkspaceLockRootIdentityV1){}
+ static make(lock:OwnedWorkspaceFsAtRegularFile,root:OwnedWorkspaceFsAtDirectory,id:WorkspaceLockRootIdentityV1){return new WorkspaceSessionReadersLockLease(lock,root,id);}
+ transfer():WorkspaceSessionReadersLockLease { if(!this.live)throw conflict(); this.live=false; return WorkspaceSessionReadersLockLease.make(this.lock,this.root,this.rootIdentity); }
+ async close():Promise<void>{if(!this.live)return;this.live=false;let failure:unknown;try{this.lock.close();}catch(e){failure=e;}try{this.root.close();}catch(e){failure??=e;}if(failure)throw conflict();}
+}
+export class VerifiedWorkspaceLockRootLease {
+ private live=true; private borrowed=0; private constructor(private readonly owner:symbol,private readonly fs:WorkspaceFsAtV1,private readonly root:OwnedWorkspaceFsAtDirectory,readonly identity:WorkspaceLockRootIdentityV1){}
+ static make(owner:symbol,fs:WorkspaceFsAtV1,root:OwnedWorkspaceFsAtDirectory,id:WorkspaceLockRootIdentityV1){return new VerifiedWorkspaceLockRootLease(owner,fs,root,id);}
+ private check(){if(!this.live)throw conflict(); const s=this.root.stat();if(s.device!==this.identity.device||s.inode!==this.identity.inode)throw conflict("workspace root identity changed");}
+ async borrow<T>(action:(b:BorrowedVerifiedWorkspaceLockRootLease)=>Promise<T>):Promise<T>{this.check();this.borrowed++;try{return await action(BorrowedVerifiedWorkspaceLockRootLease.make(this.identity,()=>this.check()));}finally{this.borrowed--;}}
+ transfer():VerifiedWorkspaceLockRootLease{this.check();if(this.borrowed)throw conflict("workspace root is borrowed");this.live=false;return VerifiedWorkspaceLockRootLease.make(this.owner,this.fs,this.root,this.identity);}
+ async acquireSessionReadersShared():Promise<WorkspaceSessionReadersLockLease>{this.check();let lock:OwnedWorkspaceFsAtRegularFile|undefined;try{lock=this.fs.openOrCreateLockAt(this.root,"session-readers.lock",0o600);this.fs.flockOwnedLock(lock,"shared","nonblocking");this.check();this.live=false;return WorkspaceSessionReadersLockLease.make(lock,this.root,this.identity);}catch(e){try{lock?.close();}catch{this.live=false;try{this.root.close();}catch{}}throw conflict();}}
+ async close():Promise<void>{if(!this.live)return;if(this.borrowed)await new Promise<void>(resolve=>{const tick=()=>this.borrowed?setTimeout(tick,1):resolve();tick();});this.live=false;try{this.root.close();}catch{throw conflict();}}
+ // package-private operation used by the writer capability; never returns the underlying handle.
+ async _withRoot<T>(action:(root:OwnedWorkspaceFsAtDirectory,fs:WorkspaceFsAtV1)=>Promise<T>):Promise<T>{this.check();return action(this.root,this.fs);}
+}
+export class VerifiedWorkspaceLockRootLeaseFactory {
+ private readonly owner=Symbol(); private readonly parent:OwnedWorkspaceFsAtDirectory;
+ constructor(private readonly input:{readonly workspaceFsAt:WorkspaceFsAtV1;readonly installationId:string;readonly sessionsRootFromValidatedInstallationConfig:string;readonly serviceUid:number;readonly provisionedWorkspaceMode:0o700}) { if(!Number.isInteger(input.serviceUid)||input.serviceUid<0)throw new Error("invalid service uid");if(input.provisionedWorkspaceMode!==0o700)throw new Error("invalid workspace mode");if(!input.sessionsRootFromValidatedInstallationConfig.startsWith("/"))throw new Error("sessions root must be absolute");let d=input.workspaceFsAt.openRoot();try{for(const c of input.sessionsRootFromValidatedInstallationConfig.split("/").filter(Boolean)) {const n=input.workspaceFsAt.openDirectoryAt(d,c);d.close();d=n;}this.parent=d;}catch(e){try{d.close();}catch{}throw e;}}
+ canonicalInput(workspaceId:string):CanonicalWorkspaceLockRootInput{if(!/^[a-z][a-z0-9-]{2,62}$/.test(workspaceId))throw conflict();return CanonicalWorkspaceLockRootInput.make(workspaceId as CanonicalWorkspaceId,this.owner);}
+ private async open(input:CanonicalWorkspaceLockRootInput):Promise<VerifiedWorkspaceLockRootLease>{if(input.owner!==this.owner)throw conflict();const root=this.input.workspaceFsAt.openDirectoryAt(this.parent,input.workspaceId);if(!exactStat(root.stat(),this.input.serviceUid)){root.close();throw conflict();}return VerifiedWorkspaceLockRootLease.make(this.owner,this.input.workspaceFsAt,root,{schemaVersion:1,workspaceId:input.workspaceId,device:root.stat().device,inode:root.stat().inode});}
+ acquire(input:CanonicalWorkspaceLockRootInput){return this.open(input);}
+ async acquireOrProvision(input:CanonicalWorkspaceLockRootInput){if(input.owner!==this.owner)throw conflict();try{return await this.open(input);}catch{try{this.input.workspaceFsAt.mkdirAt(this.parent,input.workspaceId,0o700);}catch(e){/* EEXIST is the concurrent winner; all other errors are rechecked below. */}this.input.workspaceFsAt.fsyncDirectory(this.parent);return this.open(input);}}
+}