docs: add workflow and entry points diagram

Covers all entry points verified against current code:
- REST API (POST /api/tasks + /run), chatbot MCP (submit_task,
  create_story, accept_story), GitHub webhook, Story REST API,
  agent spawn_subtask (parent_task_id vs depends_on/role paths),
  propose_epic, propose_role_config, StoryOrchestrator's internal
  spawning (ensureEvaluators/ensureArbitration/ensureFixAttempt/
  spawnNestedFixAttempt/processRetro), Scheduler retry/escalation
  and ask_user-timeout escalation, claudomator run <file> CLI.

Includes task state machine diagram and recursive arbitrated-review
cycle showing that builder-role READY means awaiting arbitration,
not done. All diagrams use Mermaid (renders on GitHub).

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

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