docs: fix workflow diagram — webhook and spawn_subtask don't auto-submit to pool

- GitHub webhook (createCIFailureTask) only calls store.CreateTask with
  PENDING state; it never calls Pool.Submit. Previous diagram said
  "creates task + auto-runs" which was wrong.

- spawn_subtask (both role= and no-role= variants) only calls
  store.CreateTask with PENDING state via storeChannel.SpawnSubtask.
  The pool is not called. Previous diagram labelled this "Pool.Submit()
  for new child/sibling" which was wrong.

- Both spawn_subtask variants always set parent_task_id. The "sibling
  with depends_on" description for the role= case was misleading.

- propose_epic and propose_role_config are storage-only writes with no
  connection to the pool at all. Previous diagram drew arrows from these
  to executor.Pool; removed and replaced with a STORAGE node.

- Added explicit note that PENDING children need a separate /run call
  (scripts/start-next-task, StoryOrchestrator.spawnRoleTask, or manual).

- StoryOrchestrator's spawnRoleTask correctly creates + QUEUED +
  Pool.Submit in one step; that path remains accurate.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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