Ci cache save if main only#4
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PR runs were producing one ~500 MB rust-cache entry per (job × rustc × Cargo.lock) tuple. With dependency churn across PRs the per-repo Actions cache budget grew to ~130 entries / ~65 GB, which trips eviction of warm main-scope entries and ultimately costs storage. PRs now still *restore* from existing caches (so they get the same speedup, ~3-5 min per job on a librdkafka cold build) but skip the save step, leaving cache writes to main only. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Lets in-flight design discussions live in the repo root as markdown without polluting git history. The current use is NOTES_DELIVERY_SEMANTICS.md, written locally as a shelf for the delivery-semantics + readiness redesign while sub-decisions (Skip semantics, commit-during-debounce concern) are still open. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Builds on main are rarely reverted, so the next main build only ever reads from the most recent run's buildkit blobs. Per-commit layers from older runs are dead weight: they accumulate, content-address collisions make them hard to evict deliberately, and they push other caches (rust-cache, etc.) closer to GitHub's 10 GB per-repo ceiling until LRU starts evicting useful entries. The keep-top-N=200 heuristic survives one multi-arch build's ~30-50 blob writes plus 2-3x headroom; older entries get the `gh cache delete` treatment. PR runs are untouched (their entries are already capped by the rust-cache save-if change in the previous commit, and buildx writes are scoped per-ref). Needs `actions: write` on the image job so gh CLI can delete cache entries via the repo's API token. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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