feat: skill prefix is now a persistent user choice (v0.12.11.0) (#571)

* feat: make skill prefix a persistent, interactive user setting

- Add --prefix flag alongside --no-prefix
- Read/write skill_prefix from ~/.gstack/config.yaml (true/false)
- Interactive prompt on first setup when no preference saved
- Non-TTY environments default to flat names (no prefix)
- Add cleanup_prefixed_claude_symlinks() for reverse direction
- Fix gstack-config sed portability (mktemp+mv instead of BSD sed -i '')
- Add SKILL_PREFIX to preamble output with namespace-aware instruction

* test: add prefix config tests + README switching instructions

8 structural tests for persistent prefix setting:
config reading, --prefix flag, config persistence, interactive
prompt, TTY fallback, reverse cleanup, cleanup ordering, welcome.

* chore: regenerate SKILL.md files with SKILL_PREFIX preamble

* chore: bump version and changelog (v0.12.11.0)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* docs: reframe changelog as feature, not mea culpa

* docs: update CONTRIBUTING + CLAUDE.md for prefix-aware vendoring

- CONTRIBUTING: vendoring now includes ./setup step for per-skill symlinks
- CONTRIBUTING: prefix choice documented in contributor workflow + dev diagram
- CONTRIBUTING: switching prefix mode section added
- CLAUDE.md: vendored symlink awareness section covers prefix setting

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -171,6 +171,12 @@ symlink or a real copy. If it's a symlink to your working directory, be aware th
 - During large refactors, remove the symlink (`rm .claude/skills/gstack`) so the
   global install at `~/.claude/skills/gstack/` is used instead
 
+**Prefix setting:** Skill symlinks use either short names (`qa -> gstack/qa`) or
+namespaced (`gstack-qa -> gstack/qa`), controlled by `skill_prefix` in
+`~/.gstack/config.yaml`. When vendoring into a project, run `./setup` after
+symlinking to create the per-skill symlinks with your preferred naming. Pass
+`--no-prefix` or `--prefix` to skip the interactive prompt.
+
 **For plan reviews:** When reviewing plans that modify skill templates or the
 gen-skill-docs pipeline, consider whether the changes should be tested in isolation
 before going live (especially if the user is actively using gstack in other windows).