Fix stale AST cache crash in fragile-path lint

[lbliii]

Summary

• Version bytecode cache entries with a Kida cache ABI tag so old pickled ASTs are not reused after AST shape changes
• Reject incompatible cached ASTs at load time and fall back to recompilation instead of crashing the visitor
• Preserve Filter.parenthesized through partial evaluation so precedence metadata survives optimization
• Add regression coverage for stale cached ASTs and the fragile-path lint path

Testing

• make lint
• make ty
• make test