feat(release-drafter): add Breaking Changes category

## What

Add a new "💥 Breaking Changes" category to the release-drafter template, ordered first so it sits above Features. The category collects PRs labeled `breaking`.

## Why

The `breaking` label already drives a major version bump via version-resolver, but breaking changes were silently bucketed under whatever other label the PR carried (feature, fix, etc.). Surfacing them as their own top-of-release section makes upgrade impact visible to consumers reading the changelog.

## Notes

- The `breaking` label is not in the autolabeler — it must still be applied manually or via another automation.
- A PR carrying both `breaking` and `feature` labels will appear under Breaking Changes only (release-drafter places each PR in the first matching category).

Signed-off-by: jmeridth <jmeridth@gmail.com>

Author: jmeridth

.github/release-drafter.yaml

@@ -8,6 +8,9 @@ template: |
   See details of [all code changes](https://github.com/$OWNER/$REPOSITORY/compare/$PREVIOUS_TAG...v$RESOLVED_VERSION) since previous release
 
 categories:
+  - title: "💥 Breaking Changes"
+    labels:
+      - "breaking"
   - title: "🚀 Features"
     labels:
       - "feature"