test: isolate suite from local environment

[hxy91819]

Summary

• run wrap fixtures with the active Node executable instead of a PATH lookup
• write child fixture output synchronously so immediate exits cannot drop buffered data
• point aggregate doctor tests at their temporary project instead of the developer working tree

Root cause

Host tests mutate PATH and aggregate doctor scans project-scoped integrations. Concurrent tests could therefore execute a fake Node binary or detect a real local host configuration such as .kiro, making the suite depend on the machine running it.

Tests

• env -u TOKENJUICE_NO_OMISSION pnpm exec vitest run test/core/wrap.test.ts test/hosts/claude-code.test.ts
• pnpm lint
• pnpm typecheck

Impact

Test-only change; no runtime, documentation, packaging, or release impact.

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