test(uat): human-UAT result packaging + outreach kit

[kunaldhongade]

Summary

• Advances issue 692 readiness: outreach invite, session checklist, stricter result.schema.json (friction + package identity + humanEvidence), per-role templates, human-uat-validate-result / human-uat-summarize.
• CI smoke now proves templates reject until filled and synthetic samples validate+summarize. Synthetic fixtures are explicitly labeled non-human.
• Does not finish human acceptance for issue 692 — real independent participants are still required before epic(ai-native): make CodeDecay a verifiably AI-first engineering safety agent #675 can close.

Test plan

• vitest run packages/knowledge/test/human-uat-kit.test.ts
• template validation fails; synthetic samples validate + summarize
• node scripts/human-uat-smoke.mjs --run-id local-dev2

Refs #692

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