test: add 17 tests for validators, hooks, and edge cases (Round 32)
Coverage improvements:
- validate-agents: empty frontmatter block, no-content frontmatter,
partial frontmatter, mixed valid/invalid agents
- validate-rules: directory with .md name (stat.isFile check),
deeply nested subdirectory rules
- validate-commands: 3-agent workflow chain, broken middle agent
- post-edit-typecheck: spaces in paths, shell metacharacters, .tsx
- check-console-log: git failure passthrough, large stdin
- post-edit-console-warn: console.error only, null tool_input
- session-end: empty transcript, whitespace-only transcript
Total tests: 686 → 703
72de0a4e2c