W4 (part two): measure AUTO_CACHE and a held catalogue context, keep neither

[donislawdev]

Summary

The second part of W4 from the performance series: a prototype of WTD_STATEACTION_AUTO_CACHE on the catalogue path of the signature check, measured before anything in the product changed.

Result: rejected, and the product does not change behaviour. This PR only writes the measurement next to the code it is about, so the next outside review does not propose it again.

• On one thread the time spent in WinVerifyTrust is the same with and without AUTO_CACHE, within the spread, even with the files grouped by catalogue.
• On several threads it is worse. The state handle stays zero after every call, so the cache lives inside the process and the calls queue behind each other: the catalogue path took 1380-1497 ms of wall clock at sixteen processors against 347-403 ms, and 1141-1442 ms against 1017-1287 ms at two.
• A catalogue context held per worker instead of per file saves about 1 ms per file on its first lookup. On two processors that is two or three percent of the 4247-4877 ms pass, smaller than the pass's own spread, so it is not done either.

Measured on 797 entries, 531 distinct files, 195 of them through 77 catalogues, with the verdicts compared file by file across every variant (no divergence).

Test plan

• Architecture tests 182/182 (the change is comments only)
• Mutation registry anchors checked, none stale
• Prototype self-test: a planted wrong hash on a warmed state was reported as the single divergence

🤖 Generated with Claude Code

[coderabbitai]

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Configuration used: Repository UI (base), Organization UI (inherited)

Review profile: ASSERTIVE

Plan: Advanced

Run ID: 528cac1e-b512-4c59-8502-38240a3b7420

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