YeonGyu-Kim a7a847eb9e feat(cli): implement default agent priority in run command
Add resolveRunAgent() to determine agent with priority:
  1. CLI --agent flag (highest)
  2. OPENCODE_DEFAULT_AGENT environment variable
  3. oh-my-opencode.json 'default_run_agent' config
  4. 'sisyphus' (fallback)

Features:
- Case-insensitive agent name matching
- Warn and fallback when requested agent is disabled
- Pick next available core agent when default is disabled
2026-02-02 13:13:06 +09:00
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