Fix lifecycle reconciliation fixed point

[Cherwayway]

Summary

• reconcile a stable proposal cohort until a post-application observation pass reaches quiescence
• expose postApplicationVerified: true only after that observation pass and require it before Outcome can report applied success
• preserve unrelated approval work, remove filename-order dependence, and centralize proposal fixture helpers
• document the bounded mechanical guarantee without moving semantic decisions into runtime code

Verification

• npm test — 194 tests, 174 passed, 20 expected Windows skips, 0 failed
• targeted lifecycle / Outcome suite — 40 passed
• final shared-helper suite — 48 passed
• git diff --check
• independent Standards review: pass
• independent Issue Spec review: pass; Ubuntu evidence delegated to this PR's Actions run

Closes #12