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

docs/CLI.md

@@ -211,7 +211,7 @@ When the server is down, **read-only commands automatically fall back to reading
 | ------- | ----------- |
 | `agenthub import rescan` | Re-scan the default `~/.claude/projects` tree (idempotent; prints imported / backfilled / skipped / errors) |
 | `agenthub import path <dir>` | Recursively import every `.jsonl` under an absolute directory (`~` is expanded server-side) |
-| `agenthub import-data <file.json>` | Restore a full dashboard export produced by `agenthub export` (or **Settings → Export data**). Idempotent and non-destructive — sessions already present are skipped whole, so it safely **consolidates several machines** into one dashboard. The file path is resolved to absolute and read server-side |
+| `agenthub import-data <file.json>` | Restore a full dashboard export produced by `agenthub export` (or **Settings → Export data**). Idempotent and non-destructive — sessions already present are skipped whole, so it safely **consolidates several machines** into one dashboard. The file is uploaded to the server, like the dashboard's Restore button |
 
 ### Remote Sources