fix(ci): add release-please config files (#600)

Add the required configuration files for release-please:
- .release-please-manifest.json: tracks current version (0.28.0)
- release-please-config.json: configures release-type as "go" and changelog sections

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: fclairamb

.release-please-manifest.json

@@ -0,0 +1,3 @@
+{
+  ".": "0.28.0"
+}

release-please-config.json

@@ -0,0 +1,22 @@
+{
+  "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json",
+  "release-type": "go",
+  "include-component-in-tag": false,
+  "include-v-in-tag": true,
+  "changelog-sections": [
+    { "type": "feat", "section": "Features" },
+    { "type": "fix", "section": "Bug Fixes" },
+    { "type": "perf", "section": "Performance Improvements" },
+    { "type": "revert", "section": "Reverts" },
+    { "type": "docs", "section": "Documentation", "hidden": true },
+    { "type": "style", "section": "Styles", "hidden": true },
+    { "type": "chore", "section": "Miscellaneous Chores", "hidden": true },
+    { "type": "refactor", "section": "Code Refactoring", "hidden": true },
+    { "type": "test", "section": "Tests", "hidden": true },
+    { "type": "build", "section": "Build System", "hidden": true },
+    { "type": "ci", "section": "Continuous Integration", "hidden": true }
+  ],
+  "packages": {
+    ".": {}
+  }
+}