perf(mapping): cut allocations building mapping state#71
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Replace pgBriefMap() in sanitizeStaleUpmaps with a PG brief index scoped to PGIDs that have upmap items. Use slices for sorted upmap items and pre-size slices where lengths are known. Benchmarks (large fixtures, benchstat vs scaffold baseline): MustGetCurrentMappingState ~3% faster, 52.7→45.8 MiB B/op, 833k→789k allocs/op MustGetCurrentMappingStateLegacyJSON ~8% faster, 47.0→40.1 MiB B/op, 833k→789k allocs/op
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Replace pgBriefMap() in sanitizeStaleUpmaps with a PG brief index scoped to PGIDs that have upmap items. Use slices for sorted upmap items and pre-size slices where lengths are known.
Benchmarks (large fixtures, benchstat vs scaffold baseline):
MustGetCurrentMappingState ~3% faster, 52.7→45.8 MiB B/op, 833k→789k allocs/op
MustGetCurrentMappingStateLegacyJSON ~8% faster, 47.0→40.1 MiB B/op, 833k→789k allocs/op