ykiko 3fa653bcaf feat(completion): mark deprecated symbols with strikethrough (#414) ...

## Summary
- Check `CXAvailability_Deprecated` on `CodeCompletionResult` and set
`CompletionItemTag::Deprecated`
- Editors render deprecated completions with a strikethrough on the
label

## Test plan
- [x] `DeprecatedTag` — `[[deprecated]]` function gets the tag
- [x] `NotDeprecated` — normal function has no Deprecated tag
- [x] All 491 unit tests pass
- [x] `pixi run format` clean

Stacked on #411.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Code completion now marks deprecated declarations with a deprecated
tag so users can see deprecated items in completion lists.

* **Tests**
* Added unit tests ensuring deprecated declarations produce completion
items with the deprecated tag and non-deprecated items do not.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

2026-04-19 13:42:32 +08:00

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