bug: skill:check fails because claude/SKILL.md is not generated

### Reproduction\n\nEnvironment: origin/main 83238f9ba28b9a5dfa3405fa625b70f7b5b99d39 plus an unrelated resolver-only commit.\n\nRun:\n\n bun run gen:skill-docs --host codex --dry-run\n bun run skill:check\n\nAll Codex skills are present and all host freshness checks report fresh, but skill:check exits 1 with:\n\n claude/SKILL.md — generated file missing! Run: bun run gen:skill-docs\n\nThe repository contains the corresponding template, while the expected generated file is absent.\n\n### Expected\n\nEither the normal generation path should produce claude/SKILL.md, or skill:check should not require that target.

Start by running `bun run gen:skill-docs --host codex --dry-run` and `bun run skill:check`, then inspect the referenced skill template and the generation and check configuration. Determine why the claude/SKILL.md target is absent from generation or incorrectly required by the check. Done means the normal workflow and `skill:check` agree, with the expected Claude file handled consistently.

Written by the indexing model from the issue text.