chore: 添加 CI 配置、codecov 和测试 mock 基础设施

Co-Authored-By: glm-5-turbo <zai-org@claude-code-best.win>

.gitignore

@@ -46,3 +46,13 @@ data
 !.codex/prompts/**
 teach-me
 credentials.json
+
+# Session-scoped progress / state files written by agents and skills
+# (autofix-pr persistence, test-progress checkpoint, recovery notes).
+# Transient, never meant to enter the repo.
+.claude-impl-state.md
+.claude-progress.md
+.claude-recovery.md
+.test-progress.md
+.squash-tmp/
+.git.*-backup