fix: detect CLIs installed by package managers

[nightcityblade]

Fixes #38

Summary

• share package-manager binary directories with CLI detection
• detect pnpm, Volta, fnm, asdf, proto, Bun, mise, and Yarn installs
• add a focused regression test for the requested package managers

Tests

• bun test
• bunx eslint src/skillkit.ts src/tool-configs.ts
• bun run build

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