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fix(plan-canvas): isolate startup lock namespace

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haelyra
2026-08-28 18:58:59 -04:00
parent 856e4907aa
commit 7df54382d2
4 changed files with 97 additions and 72 deletions
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docs/design/plan-canvas.md
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@@ -82,7 +82,7 @@ after 30 min, `ECC_PLAN_CANVAS_IDLE_MS`). Feedback is deliver-and-drain: queued
handed to exactly one `await` call and persisted to disk until then, so nothing is lost if
the poll is interrupted.
- `GET /health` — `{ok, app, version, protocolVersion, runtimeId}`; the CLI reuses a detached server only when its package, protocol, and Canvas-module fingerprint match, preventing an older same-version worktree from serving stale browser code. An OS-managed, port-scoped startup lock on a separate derived UDP endpoint serializes compatibility checks and replacement, so concurrent opens reuse the winning server without colliding with UDP traffic on the Canvas service port. The lock is released automatically when its process exits.
- `GET /health` — `{ok, app, version, protocolVersion, runtimeId}`; the CLI reuses a detached server only when its package, protocol, and Canvas-module fingerprint match, preventing an older same-version worktree from serving stale browser code. A private per-user, port-scoped ticket lock serializes compatibility checks and replacement without consuming a network endpoint, so concurrent opens reuse the winning server. Unique owner tickets make stale-process recovery safe without deleting a later caller's lock.
- `GET /` — session list (ECC chrome)
- `POST /api/sessions` `{file, reopen?}` — open/resume; `409 user-ended` unless `reopen`
- `GET /canvas/<key>` — editor chrome; `GET /artifact/<key>/` — rendered artifact