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/debug-live-issue/references/investigation-template.md

@@ -0,0 +1,32 @@
+# Investigation Template
+
+## Problem statement
+- Symptom:
+- Expected behavior:
+- First observed:
+- Scope:
+
+## Reproduction
+- Preconditions:
+- Exact steps:
+- Actual result:
+
+## Evidence
+- Logs:
+- API responses:
+- Database observations:
+- Websocket behavior:
+- UI behavior:
+
+## Root cause
+- Confirmed cause:
+- Why it happens:
+
+## Fix
+- Change summary:
+- Why this fix is minimal and safe:
+
+## Verification
+- Commands/tests run:
+- Manual verification:
+- Residual risk: