feat: improve ci (#14438)

#### PR Dependency Tree


* **PR #14438** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

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

* **Chores**
* Refined PR trigger automation to run only on open/reopen/synchronize
events
* Split native CI into platform-specific builds (Linux, Windows, macOS)
for more reliable pipelines
* Added conditional Copilot test gating to run API/E2E tests only when
relevant
* Added conditional PR-title lint skip when edits don't change the title
  * Improved test result uploads and artifact handling for gated flows
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

.github/workflows/auto-labeler.yml

@@ -1,6 +1,10 @@
 name: 'Pull Request Labeler'
 on:
-  - pull_request_target
+  pull_request_target:
+    types:
+      - opened
+      - reopened
+      - synchronize
 
 jobs:
   triage: