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/__tests__/pty-run.test.js

@@ -539,6 +539,17 @@ describe("pty-run", () => {
     assert.ok(!envFlags(claude).some((a) => a.startsWith("CODEX_HOME=")));
   });
 
+  it("keeps a claude pane off the alternate screen, so tmux scrolls (and draws a scrollbar for) it", () => {
+    const envFlags = (call) => call.filter((a, n) => call[n - 1] === "-e");
+    const claude = captureNewSession(() => pty.spawnRun({ laneId: 42, cwd: "/tmp/repo" }));
+    assert.ok(envFlags(claude).includes("CLAUDE_CODE_DISABLE_ALTERNATE_SCREEN=1"));
+    tmux.__reset();
+    const codex = captureNewSession(() =>
+      pty.spawnRun({ laneId: 43, cwd: "/tmp/repo", tool: "codex" })
+    );
+    assert.ok(!envFlags(codex).some((a) => a.startsWith("CLAUDE_CODE_DISABLE_ALTERNATE_SCREEN=")));
+  });
+
   describe("catalog tools", () => {
     const aiTools = require("../lib/ai-tools");
     const BIN = path.join(TMP, "bin");