Release 2.11: phase packets and validation ladder

[avksp]

Summary

• add bounded, source-bound phase packets for execution and review handoffs
• add read-only validation selection with protected escalation floors and exact release-full receipts
• publish v2.11.0 contracts, CLI/docs updates, and redacted economics evidence

Verification

• focused suite: 120 passed
• full suite: 2114 passed, 1 skipped
• security suite: 3 passed
• economics suite: 27 passed
• quality, repository hygiene, architecture, module-boundary, stdlib, docs, neutrality, and publication gates: PASS
• independent exact-HEAD audit: ACCEPTED with one non-blocking LOW coverage finding

Release workflow

• ALK run release-2-11-run-1: COMPLETE
• productionPromotionClaimed: false
• PyPI deployment approval may remain pending after the GitHub release and does not change this source verdict.