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__/data-transfer.test.js

@@ -179,6 +179,37 @@ describe("data-transfer export/import round-trip", () => {
     assert.equal(db.prepare("SELECT COUNT(*) c FROM events WHERE session_id='S3'").get().c, 4);
   });
 
+  it("stores a restored event's payload trimmed, like every other event insert", () => {
+    const data = JSON.stringify({
+      tool_name: "Edit",
+      tool_response: { originalFile: "x".repeat(40_000) },
+    });
+    const c = importExportBundle(db, {
+      sessions: [
+        {
+          id: "S-trim",
+          status: "completed",
+          started_at: "2026-06-01T00:00:00.000Z",
+          updated_at: "2026-06-01T00:00:00.000Z",
+          source: "local",
+          tool: "claude",
+        },
+      ],
+      events: [
+        {
+          session_id: "S-trim",
+          event_type: "PostToolUse",
+          data,
+          created_at: "2026-06-01T00:00:01.000Z",
+        },
+      ],
+    });
+    assert.equal(c.events, 1);
+    const row = db.prepare("SELECT data FROM events WHERE session_id = 'S-trim'").get();
+    assert.ok(row.data.length < 1000, `stored ${row.data.length} chars`);
+    assert.deepEqual(JSON.parse(row.data)._trimmed, ["tool_response.originalFile"]);
+  });
+
   it("rejects a non-export object", () => {
     assert.throws(() => importExportBundle(db, { foo: "bar" }), /recognizable dashboard export/);
     assert.throws(() => importExportBundle(db, { format: "something-else" }), /Unrecognized/);