## Summary
The Coding (Ideas) workflow now behaves like the board it presents:
Ideas stays inert, Todo owns planning and plan review, In progress owns
implementation, and In review owns code review and merge. The restored
preset is intentionally limited to that five-stage path, while the
existing Coding workflow remains unchanged.
Workflow execution now suspends at Todo→In progress instead of running
the implementation node early. A durable, single-owner continuation
records the exact resume node and survives process restarts; the
scheduler remains the only component allowed to admit the task into WIP.
Disabled optional review groups traverse the same boundary without
invoking a reviewer, avoiding the prior stuck-task behavior.
Workflow validation also rejects capacity holds with no reachable WIP
destination, so deterministic lifecycle deadlocks fail at authoring time
rather than after a task is running.
Session-settled decisions carried from planning: columns are execution
invariants, scheduler-owned WIP admission is preserved, the existing
Coding (Ideas) preset is restored and simplified, and invalid release
topology is rejected (user-approved).
## Validation
- `pnpm lint`
- `pnpm verify:fast`
- `pnpm test:gate` (296 engine, 128 PostgreSQL core, and 63 CI-shape
tests)
- Focused workflow lifecycle tests (106 assertions)
- PostgreSQL regression coverage proves atomic continuation replacement
and database rejection of a second active owner
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## Summary by CodeRabbit
* **New Features**
* Added durable, resumable workflow execution across capacity boundaries
(including explicit suspend/resume at the correct node).
* Introduced Todo “plan review” workflow continuations and automated
planning/capacity draining.
* Restored Coding (Ideas) as a selectable built-in and updated its lane
placement; improved optional-step group enablement support.
* **Bug Fixes**
* User moves back to Todo now cancels active workflow continuations.
* Rejected workflow boundary transitions now surface as errors (instead
of silently continuing).
* Workflows with undriveable capacity-hold configurations are now
rejected.
* **Tests / Data**
* Expanded coverage for workflow suspension, continuations, and
continuation replacement; updated database schema to persist
continuation metadata and enforce single active continuation.
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