Tasks: tier2_shared visibility upgrade / Tier 3 chunker + 4 unit tests / shell direct routing / Tier 1/2 fallback wrapper / 2 smoke tests / frozen design §10.1+§10 / docs sync (6 files) / workspace test gate / version bump 0.14.0→0.15.0 + gitea PR. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>