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docs: changelog and design status for range-read milestone M1 (part 1)

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Lists the parsers now reading through Storage, what still needs the
whole file (v2 B-tree-indexed structures: a clean error; raw data: M2),
the equivalence harness, and the evidence that nothing changed: existing
tests, a byte-identical conformance results.json and per-file probe
output against f2ff2c4, and identical slice-API transcripts over 748
files between the two builds.

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>
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osobh
2026-09-26 13:29:11 -05:00
co-authored by Claude Opus 5.5
parent 476960f4b8
commit 5d17712adb
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docs/design/range-reads.md
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# Design: range reads (reading HDF5 without holding the whole file)
Status: proposal, 2026-09-26. No library code has changed; this document is
the plan for Phase 3's largest architectural change. Every count below was
Status: proposal, 2026-09-26; the plan for Phase 3's largest architectural
change. Progress: M1, first part (the `Storage` trait and the metadata
parsers listed in `CHANGELOG.md` under "Range reads, milestone M1") is done;
group B-tree v2 lookups, dense groups and the facade are not converted yet. Every count below was
taken on `tank` on 2026-09-26 at commit `de2a53f`, with the commands given
next to it. No timing numbers appear here on purpose: the machine was shared
with other build jobs when this was written.