agent.py:
- _run_planning() now runs two sequential LLM calls:
  Phase 1 (analysis): reformulate task, identify subtasks and unknowns;
  skip immediately if DIRECT.
  Phase 2 (execution plan): assign each subtask an executor —
  TOOL/AGENT/SELF — using a structured ## Plan format.
  Phase 2 context = analysis (embedded in system prompt) + last user
  message only; full history excluded to keep focus on plan structure.
- Warn in logs when plan lacks TOOL/AGENT/SELF executor assignments.

persona.txt:
- MANDATORY sequence: step 0 = scratchpad init before anything else;
  todo tasks must mirror plan steps exactly (same order, same executors).
- PLAN → EXECUTION BINDING: explicit rule — never switch an AGENT step
  to inline execution silently.
- SCRATCHPAD: initialize sections at task start, not after first tool call;
  write context to scratchpad before briefing subagents.
- Fix typo in BRIEFING ("sub-lagent" → "sub-agent").
- Replace stale Knowledge Retrieval Protocol with accurate one-liner.

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