fix: broken cross-references, version sync, and enhanced command validator

- Fix /build-and-fix → /build-fix in tdd.md, plan.md (+ cursor, zh-CN)
- Fix non-existent explorer agent → planner in orchestrate.md (+ cursor, zh-CN, zh-TW)
- Fix /python-test → /tdd in python-review.md (+ cursor, zh-CN)
- Sync package.json version from 1.0.0 to 1.4.1 to match plugin.json
- Enhance validate-commands.js with cross-reference checking:
  command refs, agent path refs, skill dir refs, workflow diagrams
- Strip fenced code blocks before scanning to avoid false positives
- Skip hypothetical "Creates:" lines in evolve.md examples
- Add 46 new tests (suggest-compact, session-manager, utils, hooks)

docs/zh-CN/commands/plan.md

@@ -107,7 +107,7 @@ Agent (planner):
 计划之后：
 
 * 使用 `/tdd` 以测试驱动开发的方式实施
-* 如果出现构建错误，使用 `/build-and-fix`
+* 如果出现构建错误，使用 `/build-fix`
 * 使用 `/code-review` 审查已完成的实施
 
 ## 相关代理