fix(installer): install Claude skills as <name>/SKILL.md so /god-* appear in the picker

[ikkeflikkeri]

Bug

After npx godpowers --claude --global the installer reports Installed 15 slash commands to skills/ but none of the /god-* slash commands appear in Claude Code's picker. The skill files are on disk but Claude doesn't see them.

Root cause

Claude Code expects Agent Skills at ~/.claude/skills/<name>/SKILL.md — a directory per skill with a SKILL.md at its root (the Anthropic Agent Skills spec). The installer was writing each skill as a flat ~/.claude/skills/<name>.md file, which the picker never picked up.

The Codex branch already used the directory layout, which is why Codex continued to work.

Fix

Extend the existing installSkillFile Codex branch to also include claude in the directory-layout case. Mirrors the working Codex behavior and uses the same prune/uninstall logic that already understands both flat and directory forms.

Also update the success label so Claude reports Claude Code skill directories instead of the misleading skills/.

scripts/test-install-smoke.js had five Claude assertions that were encoding the broken flat-file layout as the expected behavior — those are updated to match the corrected directory layout.

Upgrade path

pruneGodpowersSkills already removes stale god-*.md flat files, so users re-running the installer against a fresh install get the corrected layout automatically. Verified end-to-end with a fake stale file in a throwaway HOME.

Diff

Two files, +18 / -12. No refactors, no new config fields, no new test files.

lib/installer-core.js         | 10 ++++++++--
scripts/test-install-smoke.js | 20 ++++++++++----------

Verification

• npm run validate-skills → 496/496 pass
• npm run test:prepublication → 12/12 pass
• End-to-end node bin/install.js --claude --global against a fresh USERPROFILE → 15 skill directories with SKILL.md inside each, label correctly reads Claude Code skill directories
• Stale-flat-file upgrade path: re-running the installer after planting a fake god-stale-flat.md removes it and writes the new directory layout; unrelated files in ~/.claude/skills/ are preserved
• Verified locally on Windows: /god, /god-init, /god-plan, /god-build, /god-mode, /god-fix, /god-ship, /god-sync, /god-undo, /god-first-run, /god-demo, /god-help, /god-surface, /god-status, and /god-version all become visible in Claude Code's picker

References

• Anthropic Agent Skills spec: https://claude.com/blog/skills
• Claude Code Skills docs: https://www.codecademy.com/article/using-skills-in-claude-code