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/mcp-operations/references/runbook.md

@@ -0,0 +1,19 @@
+# MCP Runbook
+
+## Read-only daily mode
+- Keep both mutation flags false.
+- Use read tools for observability and reporting.
+
+## Admin mode
+- Set `MCP_DASHBOARD_ALLOW_MUTATIONS=true`.
+- Run maintenance/pricing operations.
+- Reset mutation flag to false after completion.
+
+## Destructive mode
+- Set both mutation and destructive flags true.
+- Execute destructive command only with explicit confirmation token.
+- Immediately disable destructive flag after operation.
+
+## Verification commands
+- `npm run mcp:typecheck`
+- `npm run mcp:build`