feat: Claude Code Monitor — lanes, pipelines and a merged workspace

Internal SmartGift build of a Claude Code monitoring dashboard.

Lanes: a durable unit of parallel agent work, one per working directory,
tracked across session restarts. Managed lanes are git worktrees the
dashboard provisions and can reset or remove behind a three-check destroy
guard and a counted preflight; adopted lanes are directories you already
own and are never destroyable.

Pipelines: a lane moves through pipeline stages. A stage the agent declares
with evidence renders green; a stage inferred from the tool-event stream
renders dashed amber and never counts as done. Detection is forward-only
within a 30-minute window, and never writes the declared stage.

Workspace: one page at /run with a lane grid, the selected lane's pipeline,
and a full Claude console behind a disclosure.

.codex/skills/release-guard/references/release-checklist.md

@@ -0,0 +1,7 @@
+# Release Checklist
+
+- Commands in docs exist in root `package.json`.
+- Validation steps are documented for backend, frontend, and MCP.
+- Behavior-changing diffs mention migration/compatibility impacts.
+- Safety-sensitive operations remain guarded by explicit flags.
+- Troubleshooting sections reflect the current architecture.