Two agent-facing errors that recur constantly in optimization audit
logs (thousands of occurrences over five months):
1. skill_view(name, file_path='references') returned a raw
'[Errno 21] Is a directory' OS error. The local-skill branch gated
on target_file.exists(); a directory passes exists(), fell through
to read_text(), and raised. The plugin-skill sibling branch already
gated on is_file() — this aligns the local branch so a directory
request gets the same helpful not-found payload with
available_files listing instead of an OS error.
2. skill_manage rejected categorized names ('category/skill-name')
with 'not found in active profile'. _find_skill matched only the
bare directory name, while skill_view's own ambiguity hint tells
the caller to use exactly the categorized form — every call that
followed the hint failed. _find_skill now also matches the full
relative path of the skill dir, giving skill_manage resolution
parity with skill_view across edit/patch/delete/write_file/
remove_file.
Both fixes are covered by regression tests that fail on main.
kshitijk4poor
70370e089c