fix: event-loop freezes, plugin-install boot crash, tmux attach/scrollbar, Codex transcripts

- GET /api/workflows: one LEAD() window pass in a read worker (read-pool.js,
  workflow-stats.js); idx_events_session restored, idx_events_tool added
- compat-sqlite gains function/pluck/readonly so a plugin install without a
  better-sqlite3 build boots again; antigravity-usage uses db.js's Database
- install-hooks adds no checkout hooks while the agenthub plugin is enabled
  (events were doubled)
- terminal attach runs the live tmux server's own binary; the pane scrollbar
  gets a visible 2-column style, and claude panes start with
  CLAUDE_CODE_DISABLE_ALTERNATE_SCREEN=1 so tmux keeps history to scroll
- Codex sessions' conversation in GET /api/sessions/:id/transcript
- Codex/Antigravity sessions claimed by their workspace without hooks
- UI-audit follow-ups, docs and OpenAPI

server/lib/dashboard-runs.js

@@ -196,6 +196,45 @@ function laneForSession(sessionId) {
   }
 }
 
+// The newest same-tool run in session `s`'s folder that was live when it
+// started (2 s of slack: agy stamps whole seconds).
+const runOf = (col, s) => `
+  SELECT r.${col} FROM dashboard_runs r
+  WHERE r.lane_id IS NOT NULL AND r.tool = ${s}.tool AND r.cwd = ${s}.cwd
+    AND julianday(r.started_at) <= julianday(${s}.started_at) + 2.0 / 86400
+    AND julianday(${s}.started_at) <= julianday(COALESCE(r.ended_at, 'now'))
+  ORDER BY r.started_at DESC LIMIT 1`;
+const claimToolStmt = db.prepare(`
+  UPDATE sessions SET lane_id = (${runOf("lane_id", "sessions")})
+  WHERE lane_id IS NULL AND tool != 'claude' AND (@id IS NULL OR id = @id)
+    AND (${runOf("lane_id", "sessions")}) IS NOT NULL
+`);
+const claimRunStmt = db.prepare(`
+  UPDATE dashboard_runs SET session_id = @id
+  WHERE session_id IS NULL
+    AND id = (SELECT (${runOf("id", "s")}) FROM sessions s WHERE s.id = @id AND s.tool != 'claude')
+`);
+
+/**
+ * Stamp the workspace (`sessions.lane_id`) of a Codex / Antigravity session
+ * that nothing bound: their panes learn their session only from opt-in hooks
+ * (routes/hooks.js → bindRunSession), so without them a session the poll
+ * imported belonged to no workspace and vanished from it once its tab closed.
+ * Claude is left to `--session-id` + its hooks. `sessionId` null = every one;
+ * a single session also becomes its run's `session_id` while that is empty,
+ * so its live tab shows the session instead of a second "New session".
+ * ponytail: matched by (tool, cwd, time), so an agy started by hand in the
+ * same folder while a pane of that tool is live is counted as the pane's.
+ */
+function claimToolSessions(sessionId = null) {
+  try {
+    if (sessionId) claimRunStmt.run({ id: sessionId });
+    return claimToolStmt.run({ id: sessionId }).changes;
+  } catch {
+    return 0;
+  }
+}
+
 const runningStmt = db.prepare(
   "SELECT id FROM dashboard_runs WHERE status IN ('running', 'spawning')"
 );
@@ -235,4 +274,5 @@ module.exports = {
   reconcileOrphans,
   routerForSession,
   laneForSession,
+  claimToolSessions,
 };