fix(skills): resolve skill_view by frontmatter name when dir name differs

skills_list() surfaces each skill's frontmatter `name:`, but skill_view()
only matched on the on-disk directory name (Strategy 2). When a skill's
directory is a shorter category/alias that differs from its frontmatter
name, skill_view(name) failed to find it. Extend the recursive Strategy-2
walk to also match frontmatter `name:`, guarded by a try/except so an
unreadable/malformed SKILL.md can't break discovery.

Adds a regression test that creates a skill whose directory name differs
from its frontmatter name and asserts skill_view resolves it (fails on
current main, passes with this change).

Salvaged the skill_view fix from #39682 onto current main as a standalone,
single-concern change with the test the original PR lacked.

Co-authored-by: foras910521-lab <foras910521-lab@users.noreply.github.com>

tools/skills_tool.py

@@ -1032,10 +1032,21 @@ def skill_view(
                     _record(None, categorized_path.with_suffix(".md"))
 
             # Strategy 2: recursive by directory name (catches nested skills
-            # like "foundations/runtime/explore-codebase" called by bare name).
+            # like "foundations/runtime/explore-codebase" called by bare name),
+            # plus frontmatter `name:` lookup. `skills_list()` exposes the
+            # frontmatter name, so `skill_view(name)` must accept it too even
+            # when the on-disk directory is a shorter category/alias.
             for found_skill_md in iter_skill_index_files(search_dir, "SKILL.md"):
                 if found_skill_md.parent.name == name:
                     _record(found_skill_md.parent, found_skill_md)
+                    continue
+                try:
+                    fm_content = found_skill_md.read_text(encoding="utf-8")
+                    fm, _ = _parse_frontmatter(fm_content)
+                except Exception:
+                    fm = {}
+                if fm.get("name") == name:
+                    _record(found_skill_md.parent, found_skill_md)
 
             # Strategy 3: legacy flat <name>.md files anywhere under the dir.
             for found_md in search_dir.rglob(f"{name}.md"):