docs: add git commit convention to AGENTS.md

.opencode/svelte.json

@@ -0,0 +1,5 @@
+{
+	"mcp": {
+		"type": "local"
+	}
+}

AGENTS.md

@@ -35,3 +35,13 @@ When working through OpenSpec artifacts (`/opsx-*` commands), apply the same Sve
 ### Skills
 
 Load `svelte-core-bestpractices` skill when writing or reviewing Svelte components. Load `svelte-code-writer` skill for CLI-based documentation lookups and code analysis.
+
+## Git Commit Convention
+
+All git commits must follow [Google's conventional commit message format](https://github.com/googleapis/google-claude/blob/main/docs/completion-conventions.md):
+
+- **Subject line**: Maximum 50 characters, imperative mood, no period at the end
+- **Format**: `<type>[optional scope]: <description>`
+- **Allowed types**: `feat`, `fix`, `docs`, `style`, `refactor`, `test`, `build`, `ci`, `chore`, `perf`
+- **Body** (if needed): Blank line after subject, then detailed explanation wrapped at 72 characters
+- **Footer** (if needed): Use for breaking changes (`BREAKING CHANGE: ...`) and issue references