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/__tests__/LaneDiffView.test.tsx

@@ -528,6 +528,17 @@ describe("LaneDiffView — line comments", () => {
     expect(screen.queryByTestId("diff-comment-box")).toBeNull();
   });
 
+  it("docks the box under the diff once its line scrolls out of a windowed diff", () => {
+    render(<LaneDiffView file={FILE} layout="unified" onComment={() => true} />);
+    const btn = screen.getByTestId("diff-comment-line-1");
+    fireEvent.click(btn);
+    expect(screen.getByTestId("diff-comment-box").style.position).toBe("fixed");
+    // What windowing does to a row scrolled out of range.
+    btn.remove();
+    fireEvent.scroll(screen.getByTestId("lane-diff-view"));
+    expect(screen.getByTestId("diff-comment-box").style.position).toBe("");
+  });
+
   it("offers no comment button without onComment", () => {
     render(<LaneDiffView file={FILE} layout="unified" />);
     expect(screen.queryByTestId("diff-comment-line-1")).toBeNull();