docs(auth): document when to turn on the permission cache (A4) - #220
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The cache default stays 0 (off); this documents the three conditions under which an operator may enable it (p95 over target, connection pool already sized, revocation-delay ceiling accepted as policy) and the measured ceiling on what it buys post-A3: 1 of 5 authenticated-read statements, about 20%. Adds a doc-oracle test that recomputes that percentage from the same measured statement count the query-budget test pins, so the figure cannot drift out of sync with the code it describes.
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Summary
PERMISSION_CACHE_TTL_SECONDS(authenticated-read p95 over target, connection pool already sized, revocation-delay ceiling accepted as org policy) in the admin guide (EN/KO),.env.example, and the config accessor's docstring.Test plan
tests/unit/test_permission_cache_doc_contract.py) recomputes the "20%" figure from the same measured statement counttests/integration/test_request_query_budget.pypins, and checks it against.env.example, the config docstring, and both admin-guide mirrors.tests/integration/test_permission_cache.pyleft unchanged; passes (34 passed).tests/integration/test_request_query_budget.pypasses with the new named constant.tests/unitrun: 6493 passed (1 pre-existing local-disk-usage flake unrelated to this change,ScanDiskFullon a >95% full local disk).ruff check,mypyclean.node tools/ko-style/lint.mjs --all --fail-on S2: 0 findings.node tools/em-dash/lint.mjs --base origin/main: clean.Reference: concurrency-scaling-plan-2026-08-22.md §3.3/§4 (A4), tracker unit 26.