docs(plan): L1 AI decision-tree builder — Phase 2A implementation plan
19 TDD tasks from the approved spec: 3 migrations (ai_build kind, account
categories, FlowProposal l1_session_id), ai_tree_builder (constrained node
gen + validation + normalize), match_or_build orchestrator (match-first,
gate-on-build), session-service ai_build start/advance, flywheel capture on
resolve, engineer escalation notification, category settings API, and the
frontend walker/dispatch/settings/escalations surfaces + e2e.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Michael Chihlas
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