Add simple "bin" test

[colinhacks]

Ensure it doesn't set "exports"

[Copilot]

Pull request overview

This PR adds a test case to verify that zshy correctly handles packages with only a bin configuration (without exports in the zshy config), ensuring that existing exports fields in package.json are preserved while the bin field is properly updated. The PR also makes exports optional in the zshy config when a bin field is specified.

Key changes:

• Modified validation logic to allow zshy configs with only bin (no exports required)
• Added comprehensive test case with fixtures for bin-only packages
• Updated workflow trigger path (appears unrelated to main PR purpose)

Reviewed changes

Copilot reviewed 4 out of 15 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/zshy.test.ts	Adds test verifying bin updates without modifying existing exports
test/bin/tsconfig.json	Test fixture: TypeScript config for bin-only test case
test/bin/src/cli.ts	Test fixture: Simple CLI entrypoint for bin test
test/bin/package.json	Test fixture: Package config with bin in zshy config and existing exports field
test/bin/dist/*	Test fixture: Pre-built output files for bin test (8 files)
test/snapshots/zshy.test.ts.snap	Snapshot of expected test output showing bin update without exports modification
src/main.ts	Makes exports optional in zshy config when bin is specified
.github/workflows/publish-latest.yml	Reorders workflow triggers and changes path filter from VERSION.txt to package.json

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[Copilot]

[nitpick] The workflow file changes (reordering triggers and changing from 'VERSION.txt' to 'package.json') appear to be unrelated to the PR's stated purpose of "Add simple bin test" and ensuring it doesn't set exports. Consider separating these workflow changes into a separate commit or PR for clarity.

[pullfrog]

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[pullfrog]

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