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.

.claude/skills/ship-feature/references/feature-checklist.md

@@ -0,0 +1,22 @@
+# Feature Checklist
+
+- Scope
+  - Problem and success criteria are explicit.
+  - Impacted layers identified (server/client/mcp/docs/scripts).
+
+- Implementation
+  - Input validation and error handling are explicit.
+  - Existing behavior preserved where not in scope.
+  - Safety controls preserved.
+
+- Verification
+  - Backend: `npm run test:server` when backend changed.
+  - Frontend: `npm run test:client` when UI changed.
+  - MCP: `npm run mcp:typecheck` + `npm run mcp:build` when MCP changed.
+
+- Documentation
+  - `README.md`, `ARCHITECTURE.md`, `SETUP.md`, `INSTALL.md`, `mcp/README.md` updated as needed.
+  - Commands in docs match `package.json`.
+
+- Delivery
+  - Known risks and unrun checks are clearly stated.