thePR0M3TH3AN c4477ae84b perf: memoize snapshot and fingerprint; add performance and security fixtures ...

The performance fixture the plan asks for found a real defect on its first run:
evaluation was quadratic in state size. Both the snapshot and its fingerprint
were rebuilt for every target, so each of 5,000 evaluations walked every report
and every mute list. A 5,000-target pass took ~47 seconds.

- the runtime memoizes the materialized snapshot and its fingerprint until a
  store reports a change
- evaluateMany computes the fingerprint once and shares it across the batch
- decisions are cached per (profile, target); report and mute changes
  invalidate only the targets they touch, while administrative, trust, policy,
  and viewer changes drop the whole cache
- cached decisions are deeply frozen, since the cache hands the same object to
  every caller

Same pass now takes ~85ms cold, ~6ms warm.

Adds tests/performance (5,000 targets, 500 authors, 100 muters per author) and
tests/security (one case per enumerated requirement testable at this layer).

605 tests; lint, typecheck, and the declaration build pass from a cold checkout.

2026-08-09 18:07:23 -04:00

..

large-feed.test.js

perf: memoize snapshot and fingerprint; add performance and security fixtures

2026-08-09 18:07:23 -04:00