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/lib/pty-run.js

@@ -451,6 +451,11 @@ function spawnRun(args) {
     // journals and the router layer `-p <name>` loads live there — and the
     // tmux server's own env may predate, or never have had, CODEX_HOME.
     ...(tool === "codex" ? { CODEX_HOME: getCodexHome() } : {}),
+    // Claude Code inline even under `"tui": "fullscreen"`: on the alternate
+    // screen tmux keeps no history and draws no pane scrollbar, so the
+    // dashboard terminal had nothing to drag. The user's own terminals keep
+    // their setting — this reaches only panes AgentHub starts.
+    ...(tool === "claude" ? { CLAUDE_CODE_DISABLE_ALTERNATE_SCREEN: "1" } : {}),
     ...routerSpawn.env,
     ...(bypass === true && entry.bypassEnv ? entry.bypassEnv : {}),
   };