Copy-on-Write `AnnotatedTypeMirror` prototype#1837

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Commits on Jun 23, 2026

performance-notes: fix root-cause of getAnnotatedType cache mis-measurement

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performance-notes: build the pre-flow getAnnotatedType cache, then reject it

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performance-notes: mark getAnnotatedType #2 closed in the Short list index

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performance-notes: record first Guava hotspot JFR (inference is a top-2 cost)

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performance-notes/skill: consolidate getAnnotatedType cache learnings

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WIP: copy-on-write ATMs to make cache boundary flips sound (prototype)

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WIP: wall-clock investigation of COW — it is a memory win, not a wall win

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WIP: COW reference config (all 6 caches + gated); no downstream GC win

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Merge branch 'master' of github.com:eisop/checker-framework into cow-prototype
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