feat: revision-qualified annotations root for pinned runtimes (P5)

harness/tht/cli/schema_cmd.py

@@ -49,6 +49,8 @@ def physical_path(cfg) -> Path:
 
 
 def annotations_path(cfg) -> Path:
+    if cfg.paths.annotations_root is not None:
+        return cfg.paths.annotations_root / "mschema" / "annotations.yaml"
     return cfg.paths.artifacts / "mschema" / "annotations.yaml"
 
 

harness/tht/config.py

@@ -324,6 +324,9 @@ class PathsConfig(BaseModel):
     # Explicit workspace-global memory root (P3). When absent, legacy `artifacts/memory` is used
     # only through the documented migration path.
     memory: Path | None = None
+    # Revision-qualified curated FK annotations root (P5). When absent, legacy
+    # `artifacts/mschema/annotations.yaml` remains the annotations source.
+    annotations_root: Path | None = None
 
 
 class RuntimeIdentityConfig(BaseModel):
@@ -669,6 +672,8 @@ def load_config(path: Path) -> Config:
                     sessions=resolved.sessions,
                     artifacts=resolved.artifacts,
                     indexes=resolved.indexes,
+                    memory=cfg.paths.memory,
+                    annotations_root=cfg.paths.annotations_root,
                 )
             }
         )