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/compat-sqlite.js

@@ -7,15 +7,20 @@
  * On older Node versions, require() will throw and the caller should
  * handle the error (e.g. show an informative message).
  *
- * @file This module exports a Database class that wraps node:sqlite's DatabaseSync to provide a better-sqlite3-like API.
+ * @file This module exports a Database class that wraps node:sqlite's DatabaseSync to provide a better-sqlite3-like API: `pragma`, `transaction`, `function`, `stmt.pluck()` and the `readonly`/`fileMustExist` options. A plugin install has no better-sqlite3 build, so there this IS the driver.
  * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
  */
 
+const fs = require("fs");
 const { DatabaseSync } = require("node:sqlite");
 
 class Database {
-  constructor(filePath) {
-    this._db = new DatabaseSync(filePath);
+  /** better-sqlite3's `readonly` and `fileMustExist` options, mapped. */
+  constructor(filePath, { readonly = false, fileMustExist = false } = {}) {
+    if (fileMustExist && !fs.existsSync(filePath)) {
+      throw new Error(`unable to open database file: ${filePath} does not exist`);
+    }
+    this._db = new DatabaseSync(filePath, { readOnly: readonly });
   }
 
   exec(sql) {
@@ -36,7 +41,26 @@ class Database {
   }
 
   prepare(sql) {
-    return this._db.prepare(sql);
+    const stmt = this._db.prepare(sql);
+    // better-sqlite3's pluck(): get/all/iterate yield the first column only.
+    stmt.pluck = () => {
+      const first = (row) => (row === undefined ? undefined : Object.values(row)[0]);
+      const { get, all, iterate } = stmt;
+      stmt.get = (...a) => first(get.apply(stmt, a));
+      stmt.all = (...a) => all.apply(stmt, a).map(first);
+      stmt.iterate = function* (...a) {
+        for (const row of iterate.apply(stmt, a)) yield first(row);
+      };
+      return stmt;
+    };
+    return stmt;
+  }
+
+  /** better-sqlite3's db.function(name, [options], fn): a SQL function. */
+  function(name, options, fn) {
+    if (typeof options === "function") [fn, options] = [options, {}];
+    this._db.function(name, options, fn);
+    return this;
   }
 
   transaction(fn) {