fix: directive step dispatch — drop dead column refs (#137)HEADmaster

PR #136 dropped directive_steps.contract_id/contract_type and
tasks.contract_id, but several SQL queries still SELECTed or filtered
on them. The directive reconciler tripped on the first failing query
(get_ready_steps_for_dispatch), so no step ever transitioned to a
running task — symptoms were "Task has no assigned daemon" when
opening any task view, because no orchestrator-spawned tasks ever
got a daemon_id assigned.

Fixed queries:
- get_ready_steps_for_dispatch: drop SELECT ds.contract_type, drop
  WHERE ds.contract_id IS NULL filter (vacuously true now).
- get_running_steps_with_tasks: drop WHERE ds.contract_id IS NULL.
- create_directive_step: drop contract_type column from INSERT.
- cleanup_stale_anonymous_tasks: rewrite "anonymous" filter
  (contract_id IS NULL) as directive_step_id IS NULL — that was the
  intent: terminal tasks not part of a directive flow.

Also removed StepForDispatch.contract_type, CreateDirectiveStepRequest.contract_type,
and the now-orphaned warn! in phase_execution.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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