## Summary
- register workspace and text document capabilities through the
structured LSP capability types
- advertise completion, signature help, declaration, definition,
implementation, type definition, and reference support more explicitly
- add placeholder handlers for declaration, type definition, and
implementation requests so the advertised capabilities have matching
routes
## Testing
- Not run (not requested)
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
* **New Features**
* Added workspace folder support for improved project tracking.
* Registered navigation handlers for type-definition, implementation,
and declaration (currently return a “not supported yet” placeholder).
* **Improvements**
* Enhanced completion and signature help with explicit trigger
characters and clearer capability declarations.
* **Tests**
* Relaxed capability assertions to recognize more nuanced
enabled/disabled states.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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