perf(parser): cache KaTeX formula rendering across refreshes#47
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- Add a process-level cache behind a custom mpls KaTeX extender so identical formulas are not re-rendered through QuickJS on every textDocument/didChange. - Mirror the PlantUML cache pattern: sync.RWMutex-guarded map keyed by formula source with an inline/display prefix, "clear half on overflow" eviction, ClearKaTeXCache helper for tests. - 7 new tests under -tags cgo cover cache hit/miss, inline/display key separation, bounded eviction, concurrent access (-race), and a parser.HTML() integration test that proves duplicate formulas render exactly once. Fixes #46.
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Fixes #46.