chore(gitignore): 修复 src/lib 忽略规则，添加生成产物忽略规则

- 修复 src/lib 目录被错误忽略的问题 (lib/ 在 !src/lib/ 之后匹配)
- 添加 .nova-loop/ .qoder/ .superpowers/brainstorm/ 忽略
- 添加 dogfood-bain/ 测试输出目录忽略
- 添加 e2e/visual-snapshots/ 等测试产物目录忽略

.gitignore

@@ -207,9 +207,9 @@ develop-eggs/
 downloads/
 eggs/
 .eggs/
-!src/lib/
 lib/
 lib64/
+!src/lib/
 parts/
 sdist/
 var/
@@ -296,4 +296,20 @@ AGENTS.md
 
 # dogfood
 dogfood-output*/
+dogfood-bain/
+
+# agent & skill artifacts
+.nova-loop/
+.qoder/
+.superpowers/brainstorm/
+
+# test outputs
+e2e/visual-snapshots/
+responsive-test/
+visual-test/
+tests/screenshots/
+
+# reference designs
+novalon-accenture-redesign/
+
 /src/generated/prisma