docs(upstream): record the v0.53.2 release

[sunerpy]

Summary

The release record for #310 in docs/upstream-sync/UPSTREAM.md:

• Current alignment lists v0.53.2: perf(cli): allocate through mimalloc in the musl release builds #310, mimalloc as the global allocator of the static musl Linux builds. It is a release-build fix, not an upstream port, and changes no graph output.
• v0.53.2 RELEASED. This entry records:
  • release PR chore: release 0.53.2 #311's merge 0b97144 and the tag at that exact commit;
  • Release run 37118263946, all twelve jobs green on the first attempt, over main CI 37118263952;
  • the publication time and the linux-musl x86_64 digest;
  • the black-box acceptance against v0.53.1.
• The musl release builds allocate through mimalloc. A dated entry for the change itself, covering the cause, why v2 and not v3, the measurement method (corpus, command, host, toolchain, run count, range) with its table, and the two review rounds.

Docs only. The file is in .oxfmtignore.

Tests

• python3 scripts/docs-check.py passes.
• The pre-push gate passed.
• The numbers come from /tmp/verify-0.53.2.sh, run against the downloaded release (result PASS).

🤖 Generated with Claude Code

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Rerun single-sample benchmark cells before publishing

This states that eight of the nine timing/RSS cells come from a single run, so those published performance comparisons have no dispersion and may reflect startup or cache noise. The repository's benchmark methodology requires at least two runs because the first is discarded, while the scoped documentation rules require every latency or memory claim to include a reproducible run count and dispersion; rerun these cells with repeat samples and preserve the raw evidence, or omit the quantitative claims.

AGENTS.md reference: docs/AGENTS.md:L15-L16

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff             @@
##             main     #312      +/-   ##
==========================================
- Coverage   95.07%   95.07%   -0.01%     
==========================================
  Files         198      198              
  Lines      108998   108998              
==========================================
- Hits       103634   103631       -3     
- Misses       5364     5367       +3     

see 1 file with indirect coverage changes

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