docs(progress): sync after 2026-05-01 single-pipeline + delta + queryable e2e - #212
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…able e2e Capture this session's merged work at the top, retire stale follow-ups, add new ones discovered along the way. New top section: "Single-pipeline multi-sketch + delta + queryable warm tier (2026-05-01)" — itemises #210 (DDSketch delta wire fixes — three connected bugs), #211 (windowed processors pass-through so chained `[ddsketch, HLL, batch]` works), and the companion backend PRs (#70 OTLP gRPC max msg size, #71 store overlap filter + closest-pane + window annotation). Live e2e capture pasted in as evidence. Retired follow-up #1 ("Warm-tier sketch ingest is dropped at the gateway") — superseded by the new top section. Replaced the lingering "agent-side ddsketch→batch wiring quirk" note that was the chain bug now fixed by #211. Replaced the abbreviated follow-up list (#2 cold reader, #3 reducer self-check) with the actual residual after this session, in priority order: 1. Run the P7 sweep + accuracy reducer over all five sketches. 2. Backend in-memory sketch_snapshots cache loss on restart. 3. Inference config breadth (only [1m] patterns today). 4. Cold reader torn-line tolerance (carried over). 5. Reducer self-check vs engine (carried over). 6. Inline GOPRIVATE / GOTOOLCHAIN env vars in build_sketchcollector.sh. 7. Decide on OTel submodule bumps still dirty in working tree. Updated `_Last updated_` to 2026-05-01. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
Updates `PROGRESS.md` to match the merged state after the 2026-05-01 work.
Docs only; no code changes.