fix(fs): observe absence before guarded recreation

scripts/gen-cordis-catalog.ts

@@ -262,6 +262,7 @@ export const LINK_MAP: Readonly<Record<string, string>> = {
   FsEditOutcome: 'filesystem.md',
   FsEditRequest: 'filesystem.md',
   FsInfo: 'filesystem.md',
+  FsObservation: 'filesystem.md',
   FsPathInfo: 'filesystem.md',
   FsPolicyExec: 'filesystem.md',
   FsTarget: 'filesystem.md',

scripts/gen-tool-catalog.ts

@@ -253,7 +253,7 @@ const TOOL_PACKAGES: ToolPackage[] = [
     dir: 'tool-str-replace-editor',
     source: 'packages/fs/tool-str-replace-editor/src/index.ts',
     requires: ['ctx.tools', 'ctx.fs'],
-    writes: ['tool/call', 'fs/observed after successful file operations', 'tool/result'],
+    writes: ['tool/call', 'fs/observed after view presence/absence or successful mutation', 'tool/result'],
     async mount(ctx) {
       await ctx.plugin(LocalFileSystem)
       await ctx.plugin(ToolStrReplaceEditor)
@@ -266,7 +266,7 @@ const TOOL_PACKAGES: ToolPackage[] = [
     dir: 'tool-fs',
     source: 'packages/fs/tool-fs/src/index.ts',
     requires: ['ctx.tools', 'ctx.fs', 'ctx.systemPrompt'],
-    writes: ['tool/call', 'fs/write-intent or fs/edit-intent for mutations', 'fs/observed after successful file operations', 'tool/result'],
+    writes: ['tool/call', 'fs/write-intent or fs/edit-intent for mutations', 'fs/observed after read presence/absence or successful mutation', 'tool/result'],
     async mount(ctx) {
       // The tool needs `fs`; the bare provider is sufficient because policy
       // changes behavior, not schema shape.

scripts/type-equiv.manifest.json

@@ -960,6 +960,11 @@
       "symbol": "FsVersion",
       "source": "packages/fs/fs/src/types.ts"
     },
+    {
+      "doc": "docs/subsystems/filesystem.md",
+      "symbol": "FsObservation",
+      "source": "packages/fs/fs/src/types.ts"
+    },
     {
       "doc": "docs/subsystems/filesystem.md",
       "symbol": "FsInfo",