diff --git a/backend/src/tht/tht-runner.ts b/backend/src/tht/tht-runner.ts
index 43be047c..db46c031 100644
--- a/backend/src/tht/tht-runner.ts
+++ b/backend/src/tht/tht-runner.ts
@@ -148,6 +148,7 @@ export class ThtRunner {
     workspace: ReturnType<typeof parseWorkspaceYaml>;
     workspaceId: string;
     workspaceRevision: string;
+    revisionContentRoot: string;
   } {
     const identity = this.assertWorkspaceSnapshot(path);
     const fd = openSync(path, fsConstants.O_RDONLY | fsConstants.O_NOFOLLOW);
@@ -163,7 +164,7 @@ export class ThtRunner {
       if (workspace.workspace.id !== identity.workspaceId) {
         throw new Error("workspace snapshot identity does not match its path");
       }
-      return { workspace, ...identity };
+      return { workspace, ...identity, revisionContentRoot: dirname(path) };
     } finally {
       closeSync(fd);
     }
diff --git a/backend/src/workspaces/runtime-renderer.ts b/backend/src/workspaces/runtime-renderer.ts
index 9c7a32a2..7cf48902 100644
--- a/backend/src/workspaces/runtime-renderer.ts
+++ b/backend/src/workspaces/runtime-renderer.ts
@@ -1,7 +1,13 @@
+import { basename, join } from "node:path";
 import { stringify } from "yaml";
 import { buildInstallationContract } from "./contracts.js";
-import { validateWorkspaceDescriptor, type WorkspaceDescriptor, type WorkspaceV2 } from "./schema.js";
-import type { ResolvedBinding, RuntimeBindings } from "./bindings.js";
+import {
+  validateWorkspaceDescriptor,
+  type WorkspaceDescriptor,
+  type WorkspaceV2,
+  type WorkspaceV3,
+} from "./schema.js";
+import type { ResolvedBinding, ResolvedEvidenceBinding, RuntimeBindings } from "./bindings.js";
 export type { RuntimeBindings } from "./bindings.js";
 
 export interface RuntimePaths {
@@ -15,6 +21,11 @@ export interface RuntimeIdentity {
   workspaceRevision: string;
 }
 
+/** Immutable, explicit inputs needed to bind descriptor-relative content to one revision. */
+export interface RuntimeRenderContext extends RuntimeIdentity {
+  revisionContentRoot: string;
+}
+
 export interface RuntimeInstallationOverlay {
   session_storage?: unknown;
   profile?: unknown;
@@ -80,6 +91,103 @@ function legacyRestEndpoint(
   return endpoint;
 }
 
+function exactSeconds(timeoutMs: number): number {
+  return timeoutMs / 1_000;
+}
+
+function requireRuntimeRenderContext(
+  identity: RuntimeIdentity | RuntimeRenderContext | undefined,
+): RuntimeRenderContext {
+  if (!identity || !("revisionContentRoot" in identity)) {
+    throw new Error("runtime Evidence requires an immutable revision content root");
+  }
+  return identity;
+}
+
+function evidenceBindingValue(binding: ResolvedEvidenceBinding, name: string): string | undefined {
+  return binding.values[name];
+}
+
+function requireEvidenceBinding(binding: ResolvedEvidenceBinding, name: string): string {
+  const value = evidenceBindingValue(binding, name);
+  if (value === undefined) throw new Error(`runtime binding is missing ${name}`);
+  return value;
+}
+
+function renderEvidence(
+  workspace: WorkspaceV3,
+  binding: ResolvedEvidenceBinding,
+  context: RuntimeRenderContext,
+  bindingName: (suffix: string) => string,
+): { evidence: Record<string, unknown>; vector: Record<string, unknown> } | undefined {
+  if (workspace.evidence === undefined) return undefined;
+  if (binding.missing.length > 0) {
+    throw new Error("runtime configuration requires complete Evidence bindings");
+  }
+  if (basename(context.revisionContentRoot) !== context.workspaceRevision) {
+    throw new Error("runtime revision content root does not match workspace revision");
+  }
+
+  const source = workspace.evidence.source;
+  let renderedSource: Record<string, unknown>;
+  if (source.type === "filesystem") {
+    renderedSource = {
+      type: "filesystem",
+      root: join(context.revisionContentRoot, source.uri),
+      patterns: source.patterns,
+      max_bytes: source.max_bytes,
+    };
+  } else if (source.type === "http") {
+    renderedSource = {
+      type: "http",
+      ...(source.authentication === "none"
+        ? { urls: source.uris }
+        : {
+          provenance_urls: source.uris,
+          signed_urls_file: requireEvidenceBinding(binding, bindingName("SIGNED_URLS_FILE")),
+        }),
+      connect_timeout: exactSeconds(source.connect_timeout_ms),
+      read_timeout: exactSeconds(source.read_timeout_ms),
+      max_bytes: source.max_bytes,
+      max_redirects: source.max_redirects,
+      allow_private_hosts: source.allow_private_hosts,
+      max_cache_bytes: source.max_cache_bytes,
+    };
+  } else {
+    const uri = new URL(source.uri);
+    const sessionTokenFile = source.credentials === "static_files"
+      ? evidenceBindingValue(binding, bindingName("SESSION_TOKEN_FILE"))
+      : undefined;
+    renderedSource = {
+      type: "s3",
+      bucket: uri.hostname,
+      prefix: uri.pathname.replace(/^\//, ""),
+      ...(source.endpoint_url === undefined ? {} : { endpoint_url: source.endpoint_url }),
+      ...(source.region === undefined ? {} : { region: source.region }),
+      ...(source.credentials === "ambient" ? {} : {
+        access_key_file: requireEvidenceBinding(binding, bindingName("ACCESS_KEY_FILE")),
+        secret_key_file: requireEvidenceBinding(binding, bindingName("SECRET_KEY_FILE")),
+        ...(sessionTokenFile === undefined ? {} : { session_token_file: sessionTokenFile }),
+      }),
+      trusted_endpoint: source.trusted_endpoint,
+      allow_private_endpoint: source.allow_private_endpoint,
+      allow_insecure_endpoint: source.allow_insecure_endpoint,
+      max_bytes: source.max_bytes,
+      max_objects: source.max_objects,
+      max_pages: source.max_pages,
+      page_size: source.page_size,
+    };
+  }
+
+  return {
+    evidence: { sources: [renderedSource] },
+    vector: {
+      max_chunk_chars: workspace.evidence.policy.max_chunk_chars,
+      retain_published_generations: workspace.evidence.policy.retain_published_generations,
+    },
+  };
+}
+
 function placeholderConnection(identity: { database: string; schema: string }): Record<string, unknown> {
   return {
     host: "localhost",
@@ -97,13 +205,13 @@ export function renderRuntimeConfig(
   workspace: WorkspaceDescriptor,
   bindings: RuntimeBindings,
   paths: RuntimePaths,
-  identity?: RuntimeIdentity,
+  identity?: RuntimeIdentity | RuntimeRenderContext,
   installation: RuntimeInstallationOverlay = {},
   semanticRuntime: SemanticRuntimeConfig = DEFAULT_SEMANTIC_RUNTIME,
 ): string {
   const descriptor = validateWorkspaceDescriptor(workspace);
   const contract = buildInstallationContract(descriptor);
-  const name = (role: "DWH" | "VECTOR" | "EMBEDDING", suffix: string) => {
+  const name = (role: "DWH" | "VECTOR" | "EMBEDDING" | "EVIDENCE", suffix: string) => {
     const variable = contract.variables.find((entry) => entry.role === role && entry.suffix === suffix);
     if (!variable) throw new Error(`workspace contract is missing ${role}_${suffix}`);
     return variable.name;
@@ -112,6 +220,15 @@ export function renderRuntimeConfig(
     if (descriptor.workspace.schema_version === 1) {
       throw new Error("Workspace descriptor requires explicit migration to schema version 2");
     }
+    const canonicalV3 = descriptor as WorkspaceV3;
+    const renderedEvidence = canonicalV3.evidence === undefined
+      ? undefined
+      : renderEvidence(
+        canonicalV3,
+        bindings.evidence,
+        requireRuntimeRenderContext(identity),
+        (suffix) => name("EVIDENCE", suffix),
+      );
     if (bindings.dwh.missing.length > 0) {
       throw new Error("runtime configuration requires complete bindings");
     }
@@ -155,6 +272,7 @@ export function renderRuntimeConfig(
       },
       roots: paths,
       paths,
+      ...(renderedEvidence ?? {}),
     };
     if (bindings.dwh.transport === "postgres_direct") {
       renderedV3.dwh = { type: "postgres_direct", connection: database };
diff --git a/backend/test/workspace-runtime-handoff.test.ts b/backend/test/workspace-runtime-handoff.test.ts
index 73b1febe..94ef0684 100644
--- a/backend/test/workspace-runtime-handoff.test.ts
+++ b/backend/test/workspace-runtime-handoff.test.ts
@@ -1,6 +1,7 @@
 import { execFile } from "node:child_process";
 import {
-  chmodSync, existsSync, mkdtempSync, mkdirSync, readFileSync, readdirSync, rmSync, writeFileSync,
+  chmodSync, existsSync, mkdtempSync, mkdirSync, readFileSync, readdirSync, realpathSync, rmSync,
+  writeFileSync,
 } from "node:fs";
 import { tmpdir } from "node:os";
 import { join, resolve } from "node:path";
@@ -42,6 +43,18 @@ llm_policy:
   allowed: [zai/glm-5.2]
 `;
 
+const filesystemWorkspace = `${canonicalWorkspace}evidence:
+  source:
+    type: filesystem
+    uri: workspace-content/psd-clinical/evidence
+`;
+
+function evidenceWorkspace(source: string, policy = ""): string {
+  return `${canonicalWorkspace}evidence:
+  source:
+${source}${policy}`;
+}
+
 const migrationRequiredWorkspace = canonicalWorkspace
   .replace("schema_version: 3", "schema_version: 2")
   .replace(
@@ -63,7 +76,7 @@ async function git(cwd: string, args: string[]): Promise<string> {
   return (await runFile("git", args, { cwd })).stdout.trim();
 }
 
-async function fixture(workspaceSource = canonicalWorkspace) {
+async function fixture(workspaceSource = filesystemWorkspace) {
   const root = mkdtempSync(join(tmpdir(), "tht-runtime-handoff-"));
   roots.push(root);
   const remote = join(root, "remote.git");
@@ -78,14 +91,26 @@ async function fixture(workspaceSource = canonicalWorkspace) {
   await git(source, ["config", "user.email", "runtime-handoff@example.invalid"]);
   mkdirSync(join(source, "workspaces"));
   writeFileSync(join(source, "workspaces", "psd-clinical.yaml"), workspaceSource);
-  await git(source, ["add", "workspaces/psd-clinical.yaml"]);
+  const evidenceRoot = join(source, "workspace-content", "psd-clinical", "evidence");
+  mkdirSync(evidenceRoot, { recursive: true });
+  writeFileSync(join(evidenceRoot, "guide.md"), "# Immutable revision evidence\n");
+  await git(source, ["add", "."]);
   await git(source, ["commit", "-m", "Canonical workspace"]);
   await git(source, ["remote", "add", "origin", remote]);
   await git(source, ["push", "origin", "main"]);
   mkdirSync(secretRoot);
-  for (const name of ["dwh-password"]) {
+  const secretContents: Record<string, string> = {
+    "dwh-password": "dwh-password-value",
+    "evidence-signed-urls.json": JSON.stringify([
+      "https://evidence.example.test/guide.md?token=SIGNED-HANDOFF-CANARY",
+    ]),
+    "evidence-access": "ACCESS-HANDOFF-CANARY",
+    "evidence-secret": "SECRET-HANDOFF-CANARY",
+    "evidence-token": "TOKEN-HANDOFF-CANARY",
+  };
+  for (const [name, contents] of Object.entries(secretContents)) {
     const path = join(secretRoot, name);
-    writeFileSync(path, `${name}-value`, { mode: 0o600 });
+    writeFileSync(path, contents, { mode: 0o600 });
     chmodSync(path, 0o600);
   }
   mkdirSync(dataRoot);
@@ -109,10 +134,14 @@ async function fixture(workspaceSource = canonicalWorkspace) {
     THT_WS_PSD_CLINICAL_DWH_PORT: "5432",
     THT_WS_PSD_CLINICAL_DWH_USER: "reader",
     THT_WS_PSD_CLINICAL_DWH_PASSWORD_FILE: join(secretRoot, "dwh-password"),
+    THT_WS_PSD_CLINICAL_EVIDENCE_SIGNED_URLS_FILE: join(secretRoot, "evidence-signed-urls.json"),
+    THT_WS_PSD_CLINICAL_EVIDENCE_ACCESS_KEY_FILE: join(secretRoot, "evidence-access"),
+    THT_WS_PSD_CLINICAL_EVIDENCE_SECRET_KEY_FILE: join(secretRoot, "evidence-secret"),
+    THT_WS_PSD_CLINICAL_EVIDENCE_SESSION_TOKEN_FILE: join(secretRoot, "evidence-token"),
   };
   for (const [name, value] of Object.entries(environment)) vi.stubEnv(name, value);
   vi.stubEnv("THT_HOME", join(root, "home"));
-  return { root, dataRoot, registry, registryConfig, revision };
+  return { root, dataRoot, secretRoot, registry, registryConfig, revision };
 }
 
 function runnerFor(f: Awaited<ReturnType<typeof fixture>>): ThtRunner {
@@ -148,30 +177,160 @@ test("real schema-v3 registry revision loads through ThtRunner and the harness c
   expect(readdirSync(join(f.registryConfig.root, "snapshots", "runtime"))).toEqual([]);
 });
 
-test("separate runtime leases hand off one stable logical workspace identity", async () => {
+test("separate runtime leases hand off byte-identical revision Evidence configs accepted by tht", async () => {
   const f = await fixture();
   const runner = runnerFor(f);
   const first = runner.acquireWorkspaceRuntime(f.revision.snapshotPath);
   const second = runner.acquireWorkspaceRuntime(f.revision.snapshotPath);
+  const expectedRoot = join(
+    f.registryConfig.root,
+    "snapshots",
+    f.revision.commit,
+    "workspace-content",
+    "psd-clinical",
+    "evidence",
+  );
 
   try {
     expect(first.path).not.toBe(second.path);
-    expect(parse(readFileSync(first.path, "utf8")).runtime_identity).toEqual({
+    const firstYaml = readFileSync(first.path, "utf8");
+    const secondYaml = readFileSync(second.path, "utf8");
+    expect(secondYaml).toBe(firstYaml);
+    expect(parse(firstYaml).runtime_identity).toEqual({
       workspace_id: "psd-clinical",
       workspace_revision: f.revision.commit,
       source_identity: "workspace://psd-clinical",
     });
-    expect(parse(readFileSync(second.path, "utf8")).runtime_identity).toEqual({
-      workspace_id: "psd-clinical",
-      workspace_revision: f.revision.commit,
-      source_identity: "workspace://psd-clinical",
+    expect(parse(firstYaml).evidence).toEqual({
+      sources: [{
+        type: "filesystem",
+        root: expectedRoot,
+        patterns: ["**/*.md"],
+        max_bytes: 10_485_760,
+      }],
     });
+    expect(parse(firstYaml).vector).toEqual({
+      max_chunk_chars: 4_000,
+      retain_published_generations: 3,
+    });
+    expect(expectedRoot).not.toContain(join(f.registryConfig.root, "repo"));
+
+    for (const lease of [first, second]) {
+      const checked = await runFile(thtBin, ["config", "check", "-c", lease.path], {
+        cwd: harnessDir,
+        env: { ...process.env, THT_HOME: join(f.root, "home") },
+      });
+      expect(`${checked.stdout}${checked.stderr}`).not.toContain("HANDOFF-CANARY");
+    }
+
+    first.release();
+    expect(existsSync(first.path)).toBe(false);
+    expect(existsSync(second.path)).toBe(true);
+    second.release();
+    expect(existsSync(second.path)).toBe(false);
   } finally {
     first.release();
     second.release();
   }
 });
 
+test("signed HTTP Evidence resolves its file binding and config check never captures its contents", async () => {
+  const f = await fixture(evidenceWorkspace(`    type: http
+    uris: [https://evidence.example.test/guide.md]
+    authentication: signed_urls_file
+    connect_timeout_ms: 1250
+    read_timeout_ms: 30001
+    max_bytes: 12345
+    max_redirects: 2
+    allow_private_hosts: false
+    max_cache_bytes: 67890
+`));
+  const runner = runnerFor(f);
+  const lease = runner.acquireWorkspaceRuntime(f.revision.snapshotPath);
+  try {
+    const yaml = readFileSync(lease.path, "utf8");
+    expect(parse(yaml).evidence.sources).toEqual([{
+      type: "http",
+      provenance_urls: ["https://evidence.example.test/guide.md"],
+      signed_urls_file: realpathSync(join(f.secretRoot, "evidence-signed-urls.json")),
+      connect_timeout: 1.25,
+      read_timeout: 30.001,
+      max_bytes: 12_345,
+      max_redirects: 2,
+      allow_private_hosts: false,
+      max_cache_bytes: 67_890,
+    }]);
+    expect(yaml).not.toContain("SIGNED-HANDOFF-CANARY");
+
+    const checked = await runFile(thtBin, ["config", "check", "-c", lease.path], {
+      cwd: harnessDir,
+      env: { ...process.env, THT_HOME: join(f.root, "home") },
+    });
+    expect(`${checked.stdout}${checked.stderr}`).not.toContain("SIGNED-HANDOFF-CANARY");
+  } finally {
+    lease.release();
+  }
+});
+
+test("static S3 Evidence resolves only configured secret-root file paths", async () => {
+  const f = await fixture(evidenceWorkspace(`    type: s3
+    uri: s3://clinical-evidence/published/
+    endpoint_url: https://s3.example.test/
+    region: eu-west-1
+    credentials: static_files
+    trusted_endpoint: true
+    allow_private_endpoint: true
+    allow_insecure_endpoint: false
+    max_bytes: 222
+    max_objects: 33
+    max_pages: 4
+    page_size: 5
+`, `  policy:
+    max_chunk_chars: 2500
+    retain_published_generations: 7
+`));
+  const runner = runnerFor(f);
+  const lease = runner.acquireWorkspaceRuntime(f.revision.snapshotPath);
+  try {
+    const yaml = readFileSync(lease.path, "utf8");
+    expect(parse(yaml).evidence.sources).toEqual([{
+      type: "s3",
+      bucket: "clinical-evidence",
+      prefix: "published/",
+      endpoint_url: "https://s3.example.test/",
+      region: "eu-west-1",
+      access_key_file: realpathSync(join(f.secretRoot, "evidence-access")),
+      secret_key_file: realpathSync(join(f.secretRoot, "evidence-secret")),
+      session_token_file: realpathSync(join(f.secretRoot, "evidence-token")),
+      trusted_endpoint: true,
+      allow_private_endpoint: true,
+      allow_insecure_endpoint: false,
+      max_bytes: 222,
+      max_objects: 33,
+      max_pages: 4,
+      page_size: 5,
+    }]);
+    expect(parse(yaml).vector).toEqual({
+      max_chunk_chars: 2_500,
+      retain_published_generations: 7,
+    });
+    for (const canary of ["ACCESS-HANDOFF-CANARY", "SECRET-HANDOFF-CANARY", "TOKEN-HANDOFF-CANARY"]) {
+      expect(yaml).not.toContain(canary);
+    }
+
+    const checked = await runFile(thtBin, ["config", "check", "-c", lease.path], {
+      cwd: harnessDir,
+      env: { ...process.env, THT_HOME: join(f.root, "home") },
+    });
+    const output = `${checked.stdout}${checked.stderr}`;
+    for (const canary of ["ACCESS-HANDOFF-CANARY", "SECRET-HANDOFF-CANARY", "TOKEN-HANDOFF-CANARY"]) {
+      expect(output).not.toContain(canary);
+    }
+  } finally {
+    lease.release();
+  }
+});
+
 test("ThtRunner refuses to render a migration-required registry snapshot", async () => {
   const f = await fixture(migrationRequiredWorkspace);
   const runner = runnerFor(f);
diff --git a/backend/test/workspace-runtime-renderer.test.ts b/backend/test/workspace-runtime-renderer.test.ts
index 7bba52a7..9f4f551a 100644
--- a/backend/test/workspace-runtime-renderer.test.ts
+++ b/backend/test/workspace-runtime-renderer.test.ts
@@ -299,3 +299,278 @@ test("renders REST bindings through the legacy rest sections without secret valu
   });
   expect(yaml).not.toContain("\n  api_key: ");
 });
+
+function evidenceWorkspace(source: Record<string, unknown>, policy?: Record<string, unknown>) {
+  return parseWorkspaceYaml(`${canonicalEvidenceWorkspace}\nevidence:\n  source: ${JSON.stringify(source)}${
+    policy === undefined ? "" : `\n  policy: ${JSON.stringify(policy)}`
+  }\n`);
+}
+
+const canonicalEvidenceWorkspace = `workspace:
+  schema_version: 3
+  id: psd-clinical
+  name: Runtime Evidence
+  language: en
+dwh:
+  engine: postgres
+  database: analytics
+  schema: mart
+  supported_transports: [postgres_direct]
+semantic_index:
+  vector_store:
+    engine: qdrant
+    collection: psd-clinical
+    dimensions: 1024
+    distance: cosine
+  embedding:
+    provider: ollama_internal
+    model: qwen3-embedding:0.6b
+    dimensions: 1024
+llm_policy:
+  allowed: [zai/glm-5.2]
+`;
+
+const evidenceRevision = "1".repeat(40);
+const evidenceContext = {
+  workspaceId: "psd-clinical",
+  workspaceRevision: evidenceRevision,
+  revisionContentRoot: `/srv/registry/snapshots/${evidenceRevision}`,
+};
+
+function evidenceRender(
+  source: Record<string, unknown>,
+  evidenceBinding: RuntimeBindings["evidence"] = { missing: [], values: {} },
+  policy?: Record<string, unknown>,
+) {
+  return renderRuntimeConfig(
+    evidenceWorkspace(source, policy),
+    { ...directBindings, evidence: evidenceBinding },
+    paths,
+    evidenceContext,
+    {},
+    semanticRuntime,
+  );
+}
+
+test("renders filesystem Evidence below the immutable revision content root with default policy", () => {
+  const yaml = evidenceRender({
+    type: "filesystem",
+    uri: "workspace-content/psd-clinical/evidence",
+  });
+  const rendered = parse(yaml);
+
+  expect(rendered.runtime_identity.workspace_revision).toBe(evidenceRevision);
+  expect(rendered.evidence).toEqual({
+    sources: [{
+      type: "filesystem",
+      root: `/srv/registry/snapshots/${evidenceRevision}/workspace-content/psd-clinical/evidence`,
+      patterns: ["**/*.md"],
+      max_bytes: 10_485_760,
+    }],
+  });
+  expect(rendered.vector).toEqual({
+    max_chunk_chars: 4_000,
+    retain_published_generations: 3,
+  });
+  expect(yaml).not.toContain("/srv/registry/repo");
+});
+
+test("renders public HTTP Evidence with exact fractional-second timeouts and every policy limit", () => {
+  const rendered = parse(evidenceRender({
+    type: "http",
+    uris: ["https://evidence.example.test/guide.md"],
+    authentication: "none",
+    connect_timeout_ms: 1_001,
+    read_timeout_ms: 30_001,
+    max_bytes: 12_345,
+    max_redirects: 0,
+    allow_private_hosts: true,
+    max_cache_bytes: 67_890,
+  }, undefined, {
+    max_chunk_chars: 2_501,
+    retain_published_generations: 7,
+  }));
+
+  expect(rendered.evidence).toEqual({
+    sources: [{
+      type: "http",
+      urls: ["https://evidence.example.test/guide.md"],
+      connect_timeout: 1.001,
+      read_timeout: 30.001,
+      max_bytes: 12_345,
+      max_redirects: 0,
+      allow_private_hosts: true,
+      max_cache_bytes: 67_890,
+    }],
+  });
+  expect(rendered.vector).toEqual({
+    max_chunk_chars: 2_501,
+    retain_published_generations: 7,
+  });
+});
+
+test("renders signed HTTP Evidence as provenance plus a validated file path only", () => {
+  const signedFile = "/run/secrets/evidence-signed-urls.json";
+  const yaml = evidenceRender({
+    type: "http",
+    uris: [
+      "https://evidence.example.test/guide.md",
+      "https://evidence.example.test/runbook.md",
+    ],
+    authentication: "signed_urls_file",
+  }, {
+    missing: [],
+    values: { THT_WS_PSD_CLINICAL_EVIDENCE_SIGNED_URLS_FILE: signedFile },
+  });
+
+  expect(parse(yaml).evidence.sources).toEqual([{
+    type: "http",
+    provenance_urls: [
+      "https://evidence.example.test/guide.md",
+      "https://evidence.example.test/runbook.md",
+    ],
+    signed_urls_file: signedFile,
+    connect_timeout: 5,
+    read_timeout: 30,
+    max_bytes: 10_485_760,
+    max_redirects: 5,
+    allow_private_hosts: false,
+    max_cache_bytes: 67_108_864,
+  }]);
+  expect(yaml).not.toContain("SIGNED-URL-CANARY-CONTENT");
+});
+
+test("renders ambient S3 Evidence without credential keys", () => {
+  const rendered = parse(evidenceRender({
+    type: "s3",
+    uri: "s3://clinical-evidence/published/guides/",
+    credentials: "ambient",
+    region: "eu-west-1",
+  }));
+
+  expect(rendered.evidence.sources).toEqual([{
+    type: "s3",
+    bucket: "clinical-evidence",
+    prefix: "published/guides/",
+    region: "eu-west-1",
+    trusted_endpoint: false,
+    allow_private_endpoint: false,
+    allow_insecure_endpoint: false,
+    max_bytes: 10_485_760,
+    max_objects: 10_000,
+    max_pages: 100,
+    page_size: 1_000,
+  }]);
+  expect(JSON.stringify(rendered.evidence)).not.toMatch(/access_key|secret_key|session_token/);
+});
+
+test("renders static S3 Evidence with endpoint policy, limits, and file paths but no contents", () => {
+  const yaml = evidenceRender({
+    type: "s3",
+    uri: "s3://clinical-evidence/published/",
+    credentials: "static_files",
+    endpoint_url: "http://minio.internal:9000/",
+    region: "eu-central-1",
+    trusted_endpoint: true,
+    allow_private_endpoint: true,
+    allow_insecure_endpoint: true,
+    max_bytes: 222,
+    max_objects: 33,
+    max_pages: 4,
+    page_size: 5,
+  }, {
+    missing: [],
+    values: {
+      THT_WS_PSD_CLINICAL_EVIDENCE_ACCESS_KEY_FILE: "/run/secrets/evidence-access",
+      THT_WS_PSD_CLINICAL_EVIDENCE_SECRET_KEY_FILE: "/run/secrets/evidence-secret",
+      THT_WS_PSD_CLINICAL_EVIDENCE_SESSION_TOKEN_FILE: "/run/secrets/evidence-token",
+    },
+  });
+
+  expect(parse(yaml).evidence.sources).toEqual([{
+    type: "s3",
+    bucket: "clinical-evidence",
+    prefix: "published/",
+    endpoint_url: "http://minio.internal:9000/",
+    region: "eu-central-1",
+    access_key_file: "/run/secrets/evidence-access",
+    secret_key_file: "/run/secrets/evidence-secret",
+    session_token_file: "/run/secrets/evidence-token",
+    trusted_endpoint: true,
+    allow_private_endpoint: true,
+    allow_insecure_endpoint: true,
+    max_bytes: 222,
+    max_objects: 33,
+    max_pages: 4,
+    page_size: 5,
+  }]);
+  expect(yaml).not.toContain("ACCESS-CANARY-CONTENT");
+  expect(yaml).not.toContain("SECRET-CANARY-CONTENT");
+  expect(yaml).not.toContain("TOKEN-CANARY-CONTENT");
+});
+
+test("omits Evidence configuration and policy when the descriptor has no Evidence", () => {
+  const rendered = parse(renderRuntimeConfig(
+    workspaceV3,
+    directBindings,
+    paths,
+    evidenceContext,
+    {},
+    semanticRuntime,
+  ));
+
+  expect(rendered).not.toHaveProperty("evidence");
+  expect(rendered).not.toHaveProperty("vector");
+});
+
+test.each([
+  {
+    source: {
+      type: "http", uris: ["https://evidence.example.test/guide.md"],
+      authentication: "signed_urls_file",
+    },
+    missing: "THT_WS_PSD_CLINICAL_EVIDENCE_SIGNED_URLS_FILE",
+  },
+  {
+    source: {
+      type: "s3", uri: "s3://clinical-evidence/published/", credentials: "static_files",
+    },
+    missing: "THT_WS_PSD_CLINICAL_EVIDENCE_SECRET_KEY_FILE",
+  },
+])("rejects missing required Evidence binding $missing before rendering", ({ source, missing }) => {
+  expect(() => evidenceRender(source, { missing: [missing], values: {} })).toThrow(
+    "runtime configuration requires complete Evidence bindings",
+  );
+});
+
+test("is byte deterministic and revision-bound for descriptor-identical content-only commits", () => {
+  const source = {
+    type: "filesystem",
+    uri: "workspace-content/psd-clinical/evidence",
+  };
+  const first = evidenceRender(source);
+  expect(evidenceRender(source)).toBe(first);
+
+  const nextRevision = "2".repeat(40);
+  const next = renderRuntimeConfig(
+    evidenceWorkspace(source),
+    directBindings,
+    paths,
+    {
+      workspaceId: "psd-clinical",
+      workspaceRevision: nextRevision,
+      revisionContentRoot: `/srv/registry/snapshots/${nextRevision}`,
+    },
+    {},
+    semanticRuntime,
+  );
+  const firstParsed = parse(first);
+  const nextParsed = parse(next);
+
+  expect(next).not.toBe(first);
+  expect(nextParsed.runtime_identity.workspace_revision).toBe(nextRevision);
+  expect(nextParsed.evidence.sources[0].root).toBe(
+    `/srv/registry/snapshots/${nextRevision}/workspace-content/psd-clinical/evidence`,
+  );
+  expect(nextParsed.evidence.sources[0].root).not.toBe(firstParsed.evidence.sources[0].root);
+});