feat: add entry metadata system with compile-time typed values

Add `Metadata<B>` trait and `#[metadata(Entry)]` attribute macro
to attach arbitrary, compile-time-typed metadata to entries.
Implement `ProgramCollect::get_metadata<T>()` for runtime retrieval,
backed by a global registry populated by `register_metadata!`.

Extend `pathf` with `MetadataPattern` to resolve metadata types
across modules at build time. Add two examples demonstrating
metadata usage with and without pathf integration.

1 files changed, 1 insertions, 0 deletions

diff --git a/mingling_pathf/src/pattern_analyzer.rs b/mingling_pathf/src/pattern_analyzer.rs
index 79b1c5a..4675dd1 100644
--- a/mingling_pathf/src/pattern_analyzer.rs
+++ b/mingling_pathf/src/pattern_analyzer.rs
@@ -36,6 +36,7 @@ pub fn init_with_config(config: PathfinderConfig) -> PatternAnalyzer {
     analyzer.add_pattern(CommandPattern);
     analyzer.add_pattern(RendererPattern);
     analyzer.add_pattern(HelpPattern);
+    analyzer.add_pattern(MetadataPattern);
     analyzer.add_pattern(CompletionPattern);
     analyzer.add_pattern(DispatcherPattern::new(config.use_dispatch_tree));
     analyzer.add_pattern(DispatcherClapPattern::new(config.use_dispatch_tree));