docs(changelog): record the 2026-07-26/27 batch (#80)

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

changelog/unreleased/2026-07-27-tooling.md

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+# Tooling: keeping the Windows CI honest
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+Three follow-ups hardened the new `ci-windows` job against the runners' pathologies, each backed by evidence rather than a blind retry: the server test suite's cleanup now retries `ENOTEMPTY`/`EBUSY` removals and runs under platform-aware deadlines (one failed cleanup used to cascade into "database is not open" across later files); core's win32 test deadline moved to 120s after instrumented runs showed a single cold Git-Bash spawn taking 35.7s on a degraded runner — with an amplification experiment proving latency flows through the engine 1:1, no race — plus a platform-neutral regression test pinning that a slow tool delays a run only by its own latency; and two cross-PR combination breaks caught by main's CI (a test fake missing a newly required member, platform-naive path expectations) were fixed the hour they appeared.