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/repo-onboarding/SKILL.md

@@ -0,0 +1,21 @@
+---
+name: repo-onboarding
+description: Understand this repository quickly before making changes. Use for architecture discovery, ownership mapping, command selection, and initial implementation planning.
+---
+
+# Repo Onboarding Skill
+
+## Workflow
+- Read `AGENTS.md`, `README.md`, and `ARCHITECTURE.md`.
+- Determine target layer: `server/`, `client/`, `mcp/`, or docs.
+- Identify the minimal file set needed for the task.
+- Select verification commands before editing.
+
+## Verification defaults
+- Backend: `npm run test:server`
+- Frontend: `npm run test:client`
+- MCP: `npm run mcp:typecheck` and `npm run mcp:build`
+
+## References
+- `references/module-map.md`
+- `references/verification-map.md`