test: write package.json for dependency install canary test

[pullfrog]

Temporary change from a dependency installation canary test run. Overwrites package.json with a minimal test fixture that includes a postinstall script writing to /tmp/postinstall-canary.txt.

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Note

Low Risk
Temporary test-only manifest change; the postinstall only writes a marker file under /tmp during CI/canary installs, not production app behavior.

Overview
Replaces the repo’s normal package.json with a minimal test package for a dependency install canary run.

The fixture renames the package to test-pkg, adds version 1.0.0, drops private, type: module, and the vitest test script, and adds a postinstall script that writes CANARY_MARKER to /tmp/postinstall-canary.txt. An empty dependencies object is included so installs still exercise the usual npm path.

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