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# Skill Reminder News and Invocation Log — discoverability system

Three-layer skill discoverability: (A) on-error hint: related skills shown on non-zero exit; (B) on-success tip: unseen skills surfaced for successful commands; (C) invocation log: runtime/skill_invocations.jsonl tracks every skill read. Skill sync diff notification deferred. Components: CommandExitHelper (PrintSkillHintOnError/OnSuccess, skill_seen.jsonl), SkillCommand (AppendSkillInvocationLog, skill_invocations.jsonl).

user/developer
skill discoverability hint log invocation error reminder

## Steps

1. ON-ERROR HINT: PrintSkillHintOnError() in Co...
2. ON-SUCCESS TIP: PrintSkillHintOnSuccess() fi...
3. INVOCATION LOG: AppendSkillInvocationLog() i...
4. DEFERRED: Skill sync diff notification (noti...
5. Verified 2026-04-22: test-skill-read-invocat...