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+# Session 0004.0 — Transcript
+
+> App: vscode-cowriting-plugin
+> Start: 2026-06-10T06-38 (PST)
+> Type: planning-and-executing
+> End: 2026-06-10T07-04 (PST)
+> Type: planning-and-executing
+> Status: **FINALIZED.**
+>
+> Driver session for Feature #4 (F2 — region-anchored threads): wrote the
+> just-in-time plan from the graduated coauthoring-inner-loop spec and executed
+> all five slices. Shipped to `main` via Gitea PR #5.
+
+## Launch prompt
+
+Build **F2 (#4) — region-anchored threads** in a planning-and-executing session:
+write the just-in-time plan from `vscode-cowriting-plugin-content/specs/coauthoring-inner-loop.md`
+(§7.2 SLICE-1..5: CoauthorStore → Anchorer → ThreadController via the Comments API →
+reload/external re-anchor → `@vscode/test-electron` E2E) and execute it. UI surface ⇒
+E2E host tests are first-class plan tasks. No live `@cline/sdk` turn / no provider-auth in F2.
+
+## Plan
+
+Implementing the **coauthoring inner-loop** spec (graduated, session 0003), first consumer
+F2 (#4): region-anchored discussion threads on the POC skeleton (#2).
+
+Slices (spec §7.2), each a plan task:
+
+- **SLICE-1** Artifact schema (`schemaVersion`, shared `anchors`/`provenance`, `threads`) +
+  `CoauthorStore` (load/save `.threads/` sidecars, stable key ordering, round-trip tests). [vscode-free, vitest]
+- **SLICE-2** `Anchorer` — `buildFingerprint`, resolution ladder (exact-unique →
+  context-disambiguated via lineHint → orphaned), live offset `shift`. [vscode-free, vitest]
+- **SLICE-3** `ThreadController` wiring to `vscode.comments` (create-on-selection, reply,
+  resolve, render). [editor-facing]
+- **SLICE-4** Reload + external-change re-anchoring (`FileSystemWatcher`) + orphaned-thread surface.
+- **SLICE-5** E2E (`@vscode/test-electron`) across create→persist→reload→re-anchor; fall back
+  to driving the `ThreadController` API + asserting Comments-controller state where the harness
+  cannot drive native Comments UI.
+
+Invariants: never silently move a thread (orphan instead, INV-1); git-native serverless JSON
+(INV-2); fingerprint is source of truth (INV-3); forward-compatible envelope for F3–F5 (INV-4);
+no live `@cline/sdk` turn / no credentials (INV-5). Done = F2 acceptance met, unit + host E2E green.
+
+Plan doc: `docs/superpowers/plans/2026-06-10-f2-region-anchored-threads.md`
+(archived to `vscode-cowriting-plugin-content/plans/`).
+
+## Session arc
+
+**Pre-state:** clean `origin/main` at the POC skeleton (#2, sessions 0002/0003).
+Spec `coauthoring-inner-loop.md` graduated in brainstorming session 0003.
+
+1. **Claim + orient** — claimed session 0004; read the spec (§6 design, §7.2
+   slices) and the POC skeleton (vscode-free `cline.ts`, esbuild CJS bundle with
+   `vscode`/`@cline/sdk` external). Memory confirmed F2/#4 as next.
+2. **Plan** — wrote the just-in-time plan with `superpowers:writing-plans`: six
+   tasks (SLICE-1..5 + README/verify), every step with complete code and TDD
+   grain, E2E host tests as first-class tasks. Branched `feat/f2-region-anchored-threads`.
+3. **Execute** with `superpowers:executing-plans`, inline (tasks are
+   type-dependent, not independent):
+   - SLICE-1 `model.ts` (schema + stable serialize) + `store.ts` — 8 unit tests.
+   - SLICE-2 `anchorer.ts` (fingerprint, ladder, shift) — 9 unit tests.
+   - SLICE-3 `threadModel.ts` (4 tests) + `threadController.ts` + `package.json`
+     contributions + `extension.ts` API. Typecheck caught `CommentThread.range`
+     being optional → guarded.
+   - SLICE-4 reload/watcher/orphan mechanics (built in S3) + `reanchor.test.ts`.
+   - SLICE-5 `@vscode/test-electron` host E2E. Two iterations: mocha UI mismatch
+     (`bdd`→`tdd`), then the external-change test needed `files.revert` because
+     `openTextDocument` serves the cached buffer. 4/4 host tests green vs VS Code
+     1.124.0.
+4. **Ship** — full sweep green (typecheck, 24 unit, build, 4 E2E). Pushed branch,
+   opened Gitea PR #5 via API, merged (autonomous), synced main, pruned branch.
+
+**Cut state:** `main` clean & pushed; F2 shipped; 24 unit + 4 host E2E green;
+plan archived; memory updated.
+
+## Deferred decisions
+
+- **CoauthorStore is vscode-free (Node `fs`); the `FileSystemWatcher` lives in
+  ThreadController, not in the store.** Spec §6.2/§6.4 lists the watcher under
+  CoauthorStore ("emits `onExternalChange`") yet also calls the store one of the
+  three *vscode-free, unit-testable* units. Those pull apart — a `FileSystemWatcher`
+  is a vscode API. Resolved in favor of testability (the spec's stated reason for
+  vscode-free): the store does pure load/save (unit-tested), and the watcher →
+  reload → re-render wiring sits in the controller and is covered by host E2E.
+  Alternative was a vscode-free event emitter on the store with the watcher
+  injected — more indirection for no test benefit. Low-stakes; flagging for spec
+  alignment when F3/F4 touch the store.
@@ -1,20 +0,0 @@
-# Session 0004.0 — Transcript
-
-> App: vscode-cowriting-plugin
-> Start: 2026-06-10T06-38 (PST)
-> Type: planning-and-executing
-> Status: **PLACEHOLDER — claimed at session start; finalized at session end.**
->
-> This file reserves session ID 0004 for vscode-cowriting-plugin. The driver replaces this
-> body with the full transcript and renames the file to its final
-> SESSION-0004.0-TRANSCRIPT-2026-06-10T06-38--<end>.md form at session end.
-
-## Launch prompt
-
-_(launch prompt not captured at claim time)_
-
-## Deferred decisions
-
-_Autonomous-mode low-confidence calls the driver made and would have
-liked operator input on. Appended as the session runs; surfaced at
-finalize. Empty if none._