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.

mcp/.env.example

@@ -0,0 +1,19 @@
+MCP_SERVER_NAME=agent-dashboard-mcp
+MCP_SERVER_VERSION=1.0.0
+MCP_DASHBOARD_BASE_URL=http://127.0.0.1:4820
+# Container examples:
+# MCP_DASHBOARD_BASE_URL=http://host.docker.internal:4820
+# MCP_DASHBOARD_BASE_URL=http://host.containers.internal:4820
+MCP_DASHBOARD_TIMEOUT_MS=10000
+MCP_DASHBOARD_RETRY_COUNT=2
+MCP_DASHBOARD_RETRY_BACKOFF_MS=250
+MCP_DASHBOARD_ALLOW_MUTATIONS=false
+MCP_DASHBOARD_ALLOW_DESTRUCTIVE=false
+MCP_LOG_LEVEL=info
+
+# Transport mode: stdio (default), http, repl
+MCP_TRANSPORT=stdio
+
+# HTTP transport settings (only used when MCP_TRANSPORT=http)
+MCP_HTTP_PORT=8819
+MCP_HTTP_HOST=127.0.0.1