feat(executor): MCP-oriented planning preamble, applied by ContainerRunner (Phase 2)

Rewrites the planning preamble to point the agent at the four MCP tools
(ask_user/report_summary/spawn_subtask/record_progress) instead of the
CLAUDOMATOR_QUESTION_FILE / CLAUDOMATOR_SUMMARY_FILE conventions: ask_user ends
the turn, report_summary replaces the summary file, spawn_subtask replaces the
POST-to-/api/tasks planning step. Git discipline is retained.

ContainerRunner previously applied no preamble at all; it now prepends this
preamble (via buildAgentInstructions) when the MCP back-channel is active and
skip_planning is false, so the in-container agent is actually guided to use the
tools. Gemini agents (no MCP) are unaffected.

https://claude.ai/code/session_01SESwn7kQ7oP62trWw6pc39

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