feat(task-board): graduate task board out of the org opt-in flag

[viktormarinho]

What is this contribution about?

Task board matured past its beta rollout, so this drops the task_board_enabled per-org opt-in gate entirely: a new migration removes the column, the requireTaskBoardEnabled check is gone from every task-board tool (create/delete/list/update/prs-get), the settings toggle card is removed, and the task-board-import route no longer auto-enables the flag on first report push. Every org now has the task board — no flag left to flip.

Screenshots/Demonstration

N/A — removes a settings toggle, no new UI.

How to Test

1. Run migrations (bun run --cwd=apps/mesh migrate) and confirm organization_settings.task_board_enabled is dropped.
2. Open any org's chat — the Tasks toggle should appear in the toolbar without needing to enable anything in Settings.
3. Confirm Settings → Organization no longer shows a "Task board" toggle.

Migration Notes

Adds migration 134-drop-task-board-enabled.ts, dropping the task_board_enabled column from organization_settings. One-way in practice (the down() re-adds the column but loses prior per-org values).

Review Checklist

• PR title is clear and descriptive
• Changes are tested and working
• Documentation is updated (if needed)
• No breaking changes

---

Summary by cubic

Make the task board always on for every organization. Removes the task_board_enabled flag and gating, drops its column, removes the settings toggle, and simplifies the import route.

• Refactors

  • Removed gating checks from task-board tools and UI; deleted the require-enabled helper, TaskBoardSettings, and useTaskBoardEnabled hooks.
  • Import route no longer auto-enables; still creates triage items as system.
  • Dropped task_board_enabled from storage types/ports and tool schemas; updated tests and permission metadata.
  • Tasks toggle and board route show when the overlay is enabled; removed board gating throughout.

• Migration

  • Adds 134-drop-task-board-enabled.ts to drop organization_settings.task_board_enabled.
  • down() re-adds the column but previous values are not restored.
  • Run: bun run --cwd=apps/mesh migrate

^{Written for commit b2e5ec4. Summary will update on new commits.}