Add test-pkg package.json for dependency installation test

[pullfrog]

Adds a package.json written during the dependency installation behavior test. The file defines a postinstall script that writes a canary file to /tmp/postinstall-canary.txt, used to verify whether postinstall scripts run during npm install.

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Note

Low Risk
Test-only package metadata with a local postinstall side effect; no production app or auth/data paths touched.

Overview
Replaces the repo’s package.json with a minimal test-pkg fixture used to exercise dependency installation behavior.

The new manifest adds a postinstall script that writes CANARY_MARKER to /tmp/postinstall-canary.txt, so tests can tell whether npm install actually runs lifecycle scripts. The previous Vitest test script and private/type: module setup are removed in favor of this empty dependencies stub.

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