test: dep install canary package.json

[pullfrog]

Adds the package.json written during the dependency installation canary test run (PR #1022). This replaces the repo's original package.json with the test version used to verify postinstall script behavior.

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Note

Low Risk
Test-only package metadata change; no production app logic, though postinstall runs on any npm install in this repo.

Overview
Replaces the repo’s package.json with the fixture used in the dependency installation canary test (from PR #1022).

The manifest is now test-pkg@1.0.0 with a postinstall script that writes CANARY_MARKER to /tmp/postinstall-canary.txt, so installs can be verified by checking that file. private, type: "module", and the vitest test script are removed; dependencies is an empty object.

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