v0.15.0 — ParsePolicy.ShouldSkipDir + tier-1 grammar refresh

Added

• ParsePolicy.ShouldSkipDir lets gateway consumers prune a directory before descending into it. This is intended for large generated/vendor trees where even file discovery and language detection can create avoidable memory pressure.

Changed

• Parser-result compatibility normalization now keeps language-specific dispatch sequences in the parser_result_*.go files instead of centralizing every per-language call chain in parser_result.go.
• Tier-1 grammar pins and blobs refreshed after the v0.14.0 release line, including Kotlin, Rust, Dart, Elixir, Erlang, OCaml, PHP, Ruby, and Swift follow-ups while keeping the Scala lock pin on the known-good ref.
• Grammargen real-corpus parity floor data now includes four additional grammars from the current focus board.

Fixed

• ImportGrammarJSON now drops reserved-word sets when the imported grammar does not expose a RESERVED wrapper, avoiding stale reserved metadata on grammars that should not carry it.
• Rust scanner support now ports string_close external-token handling for the refreshed lock pin.
• Scala LexModes fixtures now compare tail-relative layout after reverting the problematic lock pin.

Performance

• GLR node-equivalence cache now fits more comfortably in L2 by reducing the cache size and checking the epoch before touching the rest of a cache slot.
• Tree.Edit stops scanning already-sorted right-side siblings when an edit has no tail shift to apply.