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.

manifest.json

@@ -0,0 +1,28 @@
+{
+  "id": "claude-code-agent-monitor-landing",
+  "name": "Claude Code Agent Monitor",
+  "short_name": "CC Monitor",
+  "description": "Local-first monitoring dashboard for Claude Code sessions.",
+  "author": "Nguyễn Ngọc Trí Vĩ",
+  "start_url": ".",
+  "scope": ".",
+  "display": "standalone",
+  "theme_color": "#6366f1",
+  "background_color": "#07070b",
+  "orientation": "any",
+  "categories": ["developer-tools", "productivity"],
+  "icons": [
+    {
+      "src": "favicon.svg",
+      "sizes": "any",
+      "type": "image/svg+xml",
+      "purpose": "any"
+    },
+    {
+      "src": "favicon.svg",
+      "sizes": "any",
+      "type": "image/svg+xml",
+      "purpose": "maskable"
+    }
+  ]
+}