Slice 3: activity feed and active project (SSE + MCP tools)

Add internal/activity (thread-safe active project + bounded event feed with subscriber fan-out). Service exposes active-project/activity methods and takes the feed. New MCP tools get_active_project/set_active_project/get_activity and HTTP endpoints GET/POST /api/active-project, /api/activity, and /events (SSE). New <activity-feed> component updates live via EventSource; <repo-list> sets the active project on selection. Verified end-to-end in the running app: user actions push live events and set the active project (actor=user), all readable by Claude over MCP. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-09-20 08:16:42 -04:00
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+# activity-feed
+
+## Intent
+Shows the **active project** and a **live feed** of what happened — both user and
+Claude actions. It makes the coordination state visible (AGENT.md §8.2): the same
+active project and events Claude reads over MCP (`get_active_project`,
+`get_activity`), so the user can watch the two stay in sync. Groundwork for the
+graceful project handoff (§8.3).
+
+## Public surface
+- **Tag:** `<activity-feed>`
+- **Attributes/properties:** none.
+- **Fetches (initial):** `GET /api/active-project`, `GET /api/activity`.
+- **Subscribes:** `EventSource('/events')` — SSE stream; listens for `activity`
+  events (auto-reconnects if the stream drops). Closed on disconnect.
+- **Renders:** active project (basename, full path on hover) + newest-first list
+  of events, each with an actor badge (user/claude/system), a humanized kind,
+  the repo, optional detail, and a timestamp.
+
+## History
+- 2026-09-20: created — slice 3; live active-project + activity view over SSE.
+
+## Notes / gotchas
+- All server-derived text is escaped before insertion (repo paths, details,
+  kinds) — treat as untrusted (§1.1).
+- Uses shared design tokens for colors/radii — no hardcoded hex.
+- The feed is capped client-side at 200 events to mirror the server ring buffer;
+  it does not paginate history.