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* fix(extensions): parse SKILL.md on the --- delimiter line during removal
ExtensionManager._unregister_extension_skills verified an installed skill
before deleting it by reading metadata.source back from its SKILL.md with a
raw split("---", 2). That substring split stops at the first "---" anywhere
after the opening delimiter, including one embedded in a command description
(e.g. "Separate sections with --- markers"). The frontmatter was then
truncated mid-value, metadata.source parsed empty, the skill looked
unrelated, and its directory was left orphaned on uninstall.
Parse on the "---" delimiter *line* instead, reusing CommandRegistrar.
parse_frontmatter (the line-anchored parser from #3590) in both the fast
(registry-driven) and fallback (directory-scan) removal paths.
Add a regression test that installs an extension whose command description
contains "---", removes it, and asserts the skill directory is gone. Fails
before the fix (dir orphaned), passes after.
* test: cover the fallback scan branch for the --- SKILL.md parse
Copilot noted the new regression test only exercised the fast removal
path (skills_project keeps ai_skills enabled, so remove() resolves the
skills dir directly). Add test_skills_removed_with_dashes_via_fallback_scan,
which deletes init-options.json after install so _get_skills_dir() returns
None and removal takes the fallback directory-scan branch. That branch
re-reads metadata.source with an independently duplicated parser; reverting
it to the old substring split now fails this test (dir orphaned) while the
fast-path test still passes.