skills_list displays a skill's frontmatter name: when it diverges from
the directory name, every mutating skill_manage action (and the
/skills approve replay) called with that displayed name failed with a
misleading 'not found in active profile' error — nothing about profiles
was actually wrong (#99609).
_find_skill now falls back to matching the SKILL.md frontmatter name
after the directory-name/categorized scan finds nothing, with the same
MAX_NAME_LENGTH truncation skills_list applies when displaying it.
Directory-name matches keep priority (recorded only, returned after the
full scan), so one skill's frontmatter cannot shadow another skill's
directory. This also makes _create_skill's duplicate check catch a new
directory name colliding with an existing skill's displayed name — a
collision skills_list's seen-names dedup would silently hide.
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