Add release-notes, breaking-changes, and bump-version Copilot skills (#1328)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

.github/skills/bump-version/SKILL.md

@@ -0,0 +1,45 @@
+---
+name: bump-version
+description: Bump the SDK version after publishing a release. Reads the current version from src/Directory.Build.props, suggests the next minor version, and creates a pull request with the change. Use when asked to bump the version, prepare for the next release, or increment the version number.
+compatibility: Requires gh CLI with repo access for creating branches and pull requests.
+---
+
+# Bump Version
+
+Bump the SDK version in `src/Directory.Build.props` after publishing a release and create a pull request with the change.
+
+## Process
+
+### Step 1: Read Current Version
+
+Read `src/Directory.Build.props` on the default branch and extract:
+- `<VersionPrefix>` — the `MAJOR.MINOR.PATCH` version
+- `<VersionSuffix>` — the prerelease suffix (e.g. `preview.1`), if present
+
+Display the current version to the user: `{VersionPrefix}-{VersionSuffix}` or `{VersionPrefix}` if no suffix.
+
+### Step 2: Determine Next Version
+
+If the user provided a target version in their prompt, use it. Otherwise, suggest the next **minor** version with the same suffix pattern:
+
+- Current `0.9.0` with suffix `preview.1` → suggest `0.10.0-preview.1`
+- Current `1.0.0` with no suffix → suggest `1.1.0`
+- Current `1.2.3` with suffix `rc.1` → suggest `1.3.0-rc.1`
+
+Present the suggestion and let the user confirm or provide an alternative. Parse the confirmed version into its `VersionPrefix` and `VersionSuffix` components.
+
+### Step 3: Create Pull Request
+
+1. Create a new branch named `bump-version-to-{version}` (e.g. `bump-version-to-0.10.0-preview.1`) from the default branch
+2. Update `src/Directory.Build.props`:
+   - Set `<VersionPrefix>` to the new prefix
+   - Set `<VersionSuffix>` to the new suffix, or remove the element if there is no suffix
+3. Commit with message: `Bump version to {version}`
+4. Push the branch and create a pull request:
+   - **Title**: `Bump version to {version}`
+   - **Label**: `infrastructure`
+   - **Base**: default branch
+
+### Step 4: Confirm
+
+Display the pull request URL to the user.