fix: --local install creates missing gstack/ symlink so skills resolve

[anish749]

Summary

./setup --local is broken. Per-skill symlinks (qa -> gstack/qa) never resolve because there's no gstack/ directory inside .claude/skills/.

Root cause: link_claude_skill_dirs creates relative symlinks like qa -> gstack/qa. For global installs this works because the repo is ~/.claude/skills/gstack/. For --local, the skills dir is $(pwd)/.claude/skills/ and nothing creates the gstack/ entry inside it.

Fix: One line. Create ln -snf "$SOURCE_GSTACK_DIR" "$INSTALL_SKILLS_DIR/gstack" in the --local block so the symlink chain resolves: .claude/skills/qa -> gstack/qa -> /path/to/repo/qa/SKILL.md.

Repro

git clone https://github.com/garrytan/gstack && cd gstack
bun install && ./setup --local --no-prefix
ls -la .claude/skills/qa/SKILL.md   # No such file or directory

After fix:

./setup --local --no-prefix
ls -la .claude/skills/qa/SKILL.md   # resolves correctly

Test plan

• rm -rf .claude/skills && ./setup --local --no-prefix — all 28 skills linked, SKILL.md resolves
• Global install (./setup without --local) unchanged — INSTALL_SKILLS_DIR block not entered
• bun test passes

🤖 Generated with Claude Code