## Summary
- Index all enabled skills for command-based usage detection, regardless
of `allow_implicit_invocation`.
- Preserve `allow_implicit_invocation` for the model-visible implicit
routing list.
- Add regression coverage for a support/preflight skill whose `SKILL.md`
is read and whose script is run while implicit invocation is disabled.
## Root cause
`allow_implicit_invocation` was used for both model routing and
command-based usage-event detection. That meant support skills like
`data-analytics:user-context` could be read or run by other skills, but
those accesses could not emit implicit usage events.
## Validation
- `just fmt`
- `just test -p codex-core-skills
service::tests::skills_for_config_indexes_usage_detection_for_non_implicit_skills`
- `just test -p codex-core-skills` now has the new test passing, but 3
unrelated local tests fail because
`/Users/alexsong/.agents/skills/test/SKILL.md` is invalid/missing YAML
frontmatter.
alexsong-oai
f959e7fc98