Add governed self-learning Phase 1 LEARN contract and graded intake

[KangaKode]

Summary

• Risk-tier: Medium (Phase 1) — no learning/tables.py / migration changes
• Document LEARN + retrieval contracts in FEATURES (automatic vs feedback vs four-eyes vs check-in; build_knowledge_context for /resolve, chat, round-table)
• Attach Task ISA isa_closure summary into Reflection.quality_metrics when present (detect-only; omit-ISA unchanged)
• Graded feedback intake: injection detect → integrity flag; skip trust EMA when flagged (feedback row still persists)
• GOVERNANCE Non-Claim: learnings do not auto-edit skills/hooks/prompts

Test plan

• python3 -m unittest tests.test_governed_self_learning (6 OK)
• Smoke: graded intake flags injection; ISA reflection metrics present/absent correctly
• CI Validate Scaffold on this PR
• Confirm learning/tables.py untouched in diff

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