- `[2026-07-13]` **Deploy-speed real bottleneck ≠ uv sync (memory's assumption was wrong).** Buildx step log: `chown -R /app` = 251s (copy-up of the root-owned venv into a fresh layer), uv sync only 35.6s, registry layer cache already wired. Fix = drop `/app` from the chown (validated safe: zero /app runtime writes on both live instances) + uv cache-mount. Shipped as PR #359 (branch off origin/main@b60), worldtree-dev green-lit. Expected ~5min off (~11→~6min). Runner-side BuildKit cache task (b) was already done → moot.