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.

plugins/ccam-cost-guard/commands/forecast.md

@@ -0,0 +1,27 @@
+---
+description: Quick month-end spend projection from the daily trend
+argument-hint: "[week|month]"
+---
+
+Give a quick spend projection for the end of the **$ARGUMENTS** period (`week` or
+`month`; default `month` if empty).
+
+1. Fetch the trend and current spend in parallel:
+   ```
+   curl -s http://localhost:4820/api/analytics
+   curl -s http://localhost:4820/api/pricing/cost
+   ```
+   From `/api/analytics` read `daily_sessions` (`[{ date, count }]`) and the session
+   total; from `/api/pricing/cost` read `total_cost`.
+
+2. Project:
+   - `avg_cost_per_session = total_cost / total_session_count`.
+   - `avg_daily_spend = mean(last 7 days of daily_sessions[].count) × avg_cost_per_session`.
+   - `days_remaining` = days left until end of the chosen period (week → Sunday; month → last calendar day).
+   - `projected_total = total_cost + avg_daily_spend × days_remaining`.
+
+3. Print: spend-to-date, `avg_daily_spend`, `days_remaining`, and the **projected end-of-period total** (USD, 4 decimals), with a ▲/▼ note on whether the 7-day pace is above or below the trailing 14-day pace.
+
+State that daily spend is approximated from session counts. If the dashboard is
+unreachable, tell the user to start it with `npm start` from the repo root. Keep it to
+a few lines. Read-only — do not modify anything.