fix(cli): use Kilo cache for npm packages

[lambertjosh]

Summary

• Routes the npm helper default layer through Kilo's global paths so npm-installed plugins and runtime packages cache under Kilo instead of opencode.
• Adds a regression test for resolving npm-managed binaries from Kilo's cache path.

[kilo-code-bot]

WARNING: Kilo-specific change is outside the annotation block

This line is the actual default-layer switch from the shared opencode global paths to Kilo paths, but it is not covered by a kilocode_change marker. The opencode annotation check scans added lines in shared packages/opencode files, so this and the related unmarked changed lines will fail CI unless they are covered by an inline marker or surrounding block.

[kilo-code-bot]

WARNING: Kilo-specific test changes need annotation coverage

packages/opencode/test/npm.test.ts is a shared opencode test file, and the added import plus regression test are Kilo-specific. The opencode annotation check will flag these added lines unless they are covered with kilocode_change markers.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (3 files)

• .changeset/fuzzy-pigs-drop.md
• packages/opencode/src/npm/index.ts
• packages/opencode/test/npm.test.ts

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_{Reviewed by gpt-5.5-20260423 · 397,782 tokens}