docs: add Phase 3 (Learn Mode) and Phase 4 (Advanced) implementation plans

Phase 3 (7 tasks): Tour generation engine, LearnPanel + tour store,
tour player with graph highlighting, contextual node explanations,
language lesson prompts, enhanced language display, persona modes.

Phase 4 (7 tasks): /understand-diff, /understand-explain,
/understand-onboard skills, plugin registry + discovery,
embedding-based semantic search + dashboard integration.

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