Skills from cwd are not included in commands list

[LucaDiba]

Steps to reproduce:

1. Create a <cwd>/.agents/skills/my-skill/SKILL.md;
2. Start a codex-acp session.

Expected behavior: my-skill is available as a skill.

Actual behavior: my-skill is not available.

Note: user-level skills from ~/.agents/skills work correctly.
Note 2: running /$my-skill whatever is correctly recognized by Codex even though ACP doesn't expose it, so this seems to be an ACP issue.