Add builtin:coding-ideas, a capture-first variant of the default coding
pipeline. New cards land in a manual Ideas intake (autoTriage:false) and are
not auto-planned until an operator promotes them into the merged Todo
planner+capacity column, where the triage service plans them in place.
Engine foundation:
- createTask lands cards in the workflow intake column (resolvedEntryColumn)
instead of hardcoding triage; default workflow is byte-identical.
- Triage poll discovers unplanned todo tasks (bootstrap-stub prompt) and
plans them in place; finalizeApprovedTask skips the redundant move.
- Scheduler skips todo tasks that are planning or still carry a bootstrap
prompt, so unplanned cards are never dispatched.
Dashboard:
- Start button on ideas cards (ideas -> todo move triggers planning).
- Ready badge on planned todo tasks waiting for an in-progress slot.
- ideas column label in board-workflows.
Tests: workflow IR round-trip/column/node-placement, createTask intake wiring,
and updated builtin catalog order assertion.
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