add sessions/0009/SESSION-0009.0-TRANSCRIPT-2026-06-10T14-30--2026-06-10T14-32.md + replace placeholder/variant SESSION-0009.0-TRANSCRIPT-2026-06-10T14-30--INPROGRESS.md

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+# Session 0009.0 — Transcript
+
+> App: vscode-cowriting-plugin
+> Start: 2026-06-10T14-30 (PST) · End: 2026-06-10T14-32 (PST)
+> Type: planning-and-executing
+> Driver: Claude (Opus 4.8), autonomous posture · Operator: Ben Stull
+> Continuation context: same conversation as sessions 0007/0008; opened when
+> the operator's retest of the #8 fix hit the stub warning.
+
+## Launch prompt
+
+```
+Follow-up fix for #8: F5 EDH still folderless because launch.json points it at the repo folder already open in the dev window (VS Code one-folder-one-window). Point the EDH at a committed sandbox/ playground subfolder instead; update README.
+```
+
+(Operator's report: pressed F5 after PR #10 and got "Cowriting: open a folder
+first" — the new stub, proving the #8 guard works, but the EDH was still
+folderless.)
+
+## Anchor (§3.4)
+
+Issue **#8** reopened with a diagnosis comment — PR #10's `launch.json` half
+pointed the EDH at `${workspaceFolder}` (the repo), which the dev window
+already has open; VS Code won't open one folder in two windows, so plain F5
+still landed folderless.
+
+## Arc
+
+1. Gave the operator the immediate workaround (File → Open Folder in the EDH).
+2. Reopened #8 + comment; claimed 0009; branch `fix/edh-sandbox-workspace`.
+3. Added committed `sandbox/playground.md` (guided playground);
+   `launch.json` EDH args now open `${workspaceFolder}/sandbox`;
+   `sandbox/.threads/` gitignored; README F5 step updated.
+4. Gate: typecheck clean · vitest 69/69 · build OK (config/docs-only — no
+   product code, E2E unaffected). Commit `cdf2221`; **PR #11** merged
+   (`4ee2f70`); #8 auto-closed; branch deleted.
+
+No plan artifact (trivial-fix skip case). Pipeline (§9): localhost gates
+green; non-shippable extension POC, nothing deploys.
+
+## Deferred decisions
+
+No low-confidence calls — single, operator-diagnosed defect with one obvious
+fix shape (the standard extension-sample sandbox pattern).
+
+## Cut state
+
+- `main` = `origin/main` = `4ee2f70`; tree clean; no open PRs; open issues:
+  Epic #1 only. Operator F5 retest of the sandbox flow pending.
+
+## Operator plate
+
+- Retest: F5 from the dev window → EDH opens `sandbox/` →
+  `playground.md` → type / right-click → Cowriting menus.
+
+## Next-session prompt
+
+```
+/goal Capture Feature F4 (propose/accept on the applyAgentEdit seam, per coauthoring-inner-loop.md §9 OPEN→F4 and coauthoring-attribution.md §9) as a typed issue under Epic #1 on benstull/vscode-cowriting-plugin, then brainstorm its Solution Design spec in a follow-up session.
+```
@@ -1,23 +0,0 @@
-# Session 0009.0 — Transcript
-
-> App: vscode-cowriting-plugin
-> Start: 2026-06-10T14-30 (PST)
-> Type: planning-and-executing
-> Status: **PLACEHOLDER — claimed at session start; finalized at session end.**
->
-> This file reserves session ID 0009 for vscode-cowriting-plugin. The driver replaces this
-> body with the full transcript and renames the file to its final
-> SESSION-0009.0-TRANSCRIPT-2026-06-10T14-30--<end>.md form at session end.
-
-## Launch prompt
-
-```
-Follow-up fix for #8: F5 EDH still folderless because launch.json points it at the repo folder already open in the dev window (VS Code one-folder-one-window). Point the EDH at a committed sandbox/ playground subfolder instead; update README.
-
-```
-
-## 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._