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

client/src/components/lanes/LaneDiffView.tsx

@@ -751,7 +751,9 @@ export function LaneDiffView({
   const [anchor, setAnchor] = useState<{ top: number; left: number } | null>(null);
   const place = useCallback(() => {
     const r = anchorEl.current?.isConnected ? anchorEl.current.getBoundingClientRect() : null;
-    if (r) setAnchor({ top: r.bottom + 2, left: r.left });
+    // A long diff unmounts rows scrolled out of its window, the clicked number
+    // with them: the box docks under the diff rather than float over other lines.
+    setAnchor(r ? { top: r.bottom + 2, left: r.left } : null);
   }, []);
   useEffect(() => {
     if (commentAt == null) return;
@@ -764,7 +766,6 @@ export function LaneDiffView({
         ? {
             open: (line: number, el?: HTMLElement) => {
               anchorEl.current = el ?? null;
-              setAnchor(null);
               place();
               setCommentAt(line);
               setUndelivered(false);