feat(ai-tools): omp shared + OpenCode/omp sessions, tokens, subagents; Grok hooks; resume by id

- omp-usage.js / opencode-usage.js: poll each CLI's own session store into
  sessions (tool omp/opencode), token_usage per model and subagent agents;
  transcript routes read them (omp journals, OpenCode's opencode.db).
- Grok runs the Claude hooks in ~/.claude/settings.json: its hooks are now
  recognised (hookEventName + workspaceRoot), tagged tool=grok, and their
  transcript_path dropped instead of being parsed as a Claude transcript.
- Catalog `resumeById`: omp/Grok/Cursor `--resume <id>`, OpenCode
  `--session <id>`; session ids may carry `_`. The client offers Resume for
  any tool that resumes by id.
- Kimi Code and GitHub Copilot leave the catalog (their session stores could
  not be verified).

server/README.md

@@ -638,6 +638,33 @@ An `antigravity` workspace carries no pipeline either.
   `DASHBOARD_CURSOR_POLL_MS` ms (default 15000, `0` disables) into `sessions`
   rows (`tool = 'cursor'`) — no `token_usage`, the transcripts carry none —
   and `cursor_transcripts` holds the mtime read for each file.
+- **Oh My Pi sessions:** `server/lib/omp-usage.js` reads omp's session journals
+  (`~/.omp/agent/sessions/<encoded cwd>/<timestamp>_<id>.jsonl`, plus every
+  subagent journal under `<timestamp>_<id>/`) every `DASHBOARD_OMP_POLL_MS` ms
+  (default 15000, `0` disables), each from the offset the last pass stopped at,
+  into `sessions` (`tool = 'omp'`), `token_usage` (the session's own and its
+  subagents' turns, per model) and `agents` (one `omp-<session>-<key>` subagent
+  row per subagent journal). `omp_sessions` holds each journal's offset and
+  what it said so far; `GET /api/sessions/:id/transcript(s)` reads an omp
+  session's journals from there. Under S3 each member's `~/.omp` is read only
+  through `openSafeAsync`.
+- **OpenCode sessions:** `server/lib/opencode-usage.js` reads OpenCode's
+  SQLite store (`~/.local/share/opencode/opencode.db`, under `XDG_DATA_HOME`
+  when set) every `DASHBOARD_OPENCODE_POLL_MS` ms (default 15000, `0`
+  disables), when its file or WAL changed: each root `session` row becomes a
+  `sessions` row (`tool = 'opencode'`), its tree's assistant `message` tokens
+  per `modelID` become `token_usage` (reasoning counted as output), and each
+  child session (the `task` tool's) an `opencode-<id>` subagent row.
+  `opencode_stores` holds each store's mtime and `opencode_sessions` each root
+  session's newest `time_updated`; the transcript routes read the conversation
+  (messages + parts) from the store itself. A member's store and WAL are copied
+  through the guard before they are opened.
+- **Grok sessions:** Grok runs the hooks in `~/.claude/settings.json` (its
+  Claude compatibility), so AgentHub's own hook reaches `POST /api/hooks/event`
+  with no `tool`; `routes/hooks.js` tells it apart by the camelCase keys only
+  Grok sends (`hookEventName` + `workspaceRoot`), records it as `tool = 'grok'`
+  and drops its `transcript_path` (Grok's file, never parsed as a Claude
+  transcript). No tokens: Grok's session files are not read.
 - **Quiet sessions:** agy fires no exit hook, so a session quiet for ten
   minutes (with hook events) or two (without) is settled to `completed`, its
   agents too, and sets its workspace idle. That workspace must be one the hooks left