v0.2.0: KERNEL_ABI_VERSION + CapabilitySet API parity with SDK v0.3.4

Added:
- KERNEL_ABI_VERSION = 1 const in axonos-kernel-core (RFC-0006 binding)
- KERNEL_IMPL_VERSION str const (= CARGO_PKG_VERSION)
- CapabilitySet::all() method form (mirrors SDK v0.3.4)
- CapabilitySet::is_disjoint() method (2-cycle WCET)
- 8 unit tests for new CapabilitySet methods
- 5 ABI conformance tests in axonos-kernel-core
- .github/workflows/release.yml (auto-release on tag push)
- CHANGELOG.md with full history v0.1.0 -> v0.2.0
- README: ABI compatibility matrix section

No breaking changes. CapabilitySet::ALL and Capability::ALL constants
retained. Wire format byte-identical to v0.1.x.

Tandem with axonos-sdk v0.3.4 verified: both report
KERNEL_ABI_VERSION = 1 — handshake succeeds.

Author: Denis Yermakou

.github/workflows/Cargo.toml

@@ -0,0 +1,104 @@
+# AxonOS Kernel — Auto-release on tag push
+#
+# Triggers when a tag matching `v*.*.*` is pushed (e.g. v0.2.0).
+# Creates a GitHub Release with:
+#   - Title: tag name (e.g. v0.2.0)
+#   - Body: matching CHANGELOG section extracted automatically
+#   - "Latest" green banner on the repo page for stable releases
+#   - Pre-release marker for tags ending in `-rc`/`-beta`/`-alpha`
+#   - Source `.tar.gz` and `.zip` archives attached as assets
+
+name: release
+
+on:
+  push:
+    tags:
+      - 'v*.*.*'
+      - 'v*.*.*-*'
+
+permissions:
+  contents: write
+
+jobs:
+  release:
+    name: Create GitHub Release
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Extract version from tag
+        id: tag
+        run: |
+          VERSION="${GITHUB_REF#refs/tags/}"
+          VERSION_NUMBER="${VERSION#v}"
+          echo "version=$VERSION" >> "$GITHUB_OUTPUT"
+          echo "version_number=$VERSION_NUMBER" >> "$GITHUB_OUTPUT"
+          if [[ "$VERSION" == *-* ]]; then
+            echo "prerelease=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "prerelease=false" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Extract CHANGELOG section
+        id: changelog
+        run: |
+          VERSION="${{ steps.tag.outputs.version }}"
+          BODY=""
+          if [ -f CHANGELOG.md ]; then
+            BODY=$(awk -v ver="$VERSION" '
+              $0 ~ "^## \\[" ver "\\]" { capture=1; print; next }
+              capture && /^## \[v[0-9]+\.[0-9]+\.[0-9]+\]/ { exit }
+              capture { print }
+            ' CHANGELOG.md)
+          fi
+
+          if [ -z "$BODY" ]; then
+            BODY="Release $VERSION. See [CHANGELOG.md](./CHANGELOG.md) for details."
+          fi
+
+          {
+            echo "body<<CHANGELOG_EOF"
+            echo "$BODY"
+            echo ""
+            echo "---"
+            echo ""
+            echo "**ABI compatibility:** \`KERNEL_ABI_VERSION = 1\` (see [RFC-0006](https://github.com/AxonOS-org/axonos-rfcs))"
+            echo ""
+            echo "**Source archive:** see assets below."
+            echo "**Full changelog:** [CHANGELOG.md](https://github.com/${{ github.repository }}/blob/${{ steps.tag.outputs.version }}/CHANGELOG.md)"
+            echo "CHANGELOG_EOF"
+          } >> "$GITHUB_OUTPUT"
+
+      - name: Build source archives
+        run: |
+          VERSION="${{ steps.tag.outputs.version }}"
+          ARCHIVE="axonos-kernel-${VERSION}.tar.gz"
+          ZIP="axonos-kernel-${VERSION}.zip"
+          git archive --format=tar.gz \
+            --prefix="axonos-kernel-${{ steps.tag.outputs.version_number }}/" \
+            -o "$ARCHIVE" \
+            "$VERSION"
+          git archive --format=zip \
+            --prefix="axonos-kernel-${{ steps.tag.outputs.version_number }}/" \
+            -o "$ZIP" \
+            "$VERSION"
+          ls -lh "$ARCHIVE" "$ZIP"
+
+      - name: Create GitHub Release
+        uses: softprops/action-gh-release@v2
+        with:
+          tag_name: ${{ steps.tag.outputs.version }}
+          name: ${{ steps.tag.outputs.version }}
+          body: ${{ steps.changelog.outputs.body }}
+          draft: false
+          prerelease: ${{ steps.tag.outputs.prerelease }}
+          make_latest: ${{ steps.tag.outputs.prerelease == 'false' && 'true' || 'false' }}
+          files: |
+            axonos-kernel-${{ steps.tag.outputs.version }}.tar.gz
+            axonos-kernel-${{ steps.tag.outputs.version }}.zip
+          fail_on_unmatched_files: true
+          generate_release_notes: false