fix(scm): 🐛 reject empty generated commit messages

Author: Mirrowel

src/services/commit-message/CommitMessageGenerator.ts

@@ -236,6 +236,12 @@ FINAL REMINDER: Your message MUST be COMPLETELY DIFFERENT from the previous mess
 		const cleaned = response.trim()
 		const withoutCodeBlocks = cleaned.replace(/^```[a-zA-Z0-9_-]*\r?\n/, "").replace(/\r?\n```$/, "")
 		const withoutQuotes = withoutCodeBlocks.replace(/^["'`]|["'`]$/g, "")
-		return withoutQuotes.trim()
+		const normalized = withoutQuotes.trim()
+
+		if (!normalized) {
+			throw new Error("AI returned an empty commit message")
+		}
+
+		return normalized
 	}
 }

src/services/commit-message/__tests__/CommitMessageGenerator.spec.ts

@@ -200,4 +200,19 @@ Keep unstaged commit context focused on worktree changes.
 
 Keep unstaged commit context focused on worktree changes.`)
 	})
+
+	it("fails when AI output is empty after cleanup", async () => {
+		completePrompt.mockResolvedValue("```\n   \n```")
+		const generator = createGenerator()
+
+		await expect(
+			generator.generateMessage({
+				workspacePath: "/repo",
+				selectedFiles: ["src/file.ts"],
+				gitContext: "Modified (staged): src/file.ts",
+			}),
+		).rejects.toThrow("AI returned an empty commit message")
+
+		expect(captureGenerated).not.toHaveBeenCalled()
+	})
 })