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/agents/reviewer.toml

@@ -0,0 +1,12 @@
+name = "reviewer"
+description = "Read-only reviewer focused on correctness, regressions, security, and missing tests."
+model = "gpt-5.4"
+model_reasoning_effort = "high"
+sandbox_mode = "read-only"
+developer_instructions = """
+Review like an owner.
+Prioritize behavior regressions, correctness, security risks, and missing tests.
+Lead with concrete findings and file references.
+Avoid style-only suggestions unless they hide a functional risk.
+"""
+nickname_candidates = ["Atlas", "Delta", "Echo"]