* fix(#2808): SKILL.md name uses hyphen form for Claude Code autocomplete
skillFrontmatterName() was converting gsd-<cmd> to gsd:<cmd> (colon) so
installed SKILL.md files had name: gsd:add-phase etc. Claude Code surfaces
this name in autocomplete, showing the deprecated colon form to users even
though the hyphen form is canonical everywhere else.
Root cause: the colon form was needed because workflows called
Skill(skill="gsd:<cmd>"). All 4 remaining colon-form Skill() calls in
autonomous.md and execute-phase.md are updated to hyphen form.
skillFrontmatterName() now returns the hyphen dir name unchanged.
Updated 4 existing tests that asserted colon form.
Regression test: tests/bug-2808-skill-hyphen-name.test.cjs
* fix(#2808): address CodeRabbit — bash/text fences, structured test assertions, fail-loud on errors
5fe1f00a0d