fix: do not report committed=true for empty commit SHA

[EndBug]

Summary

• Only set the committed output to true when git.commit() returns a non-empty SHA.
• Fail the step if simple-git resolves without creating a commit, so workflows that gate on committed no longer get a false success signal.

Test plan

• Unit tests / lint pass (npm test)
• Simulate a no-op commit path (empty SHA from simple-git) and confirm the action fails with committed=false
• Normal commit with staged changes still sets committed=true and populates commit_sha / commit_long_sha

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📥 Commits

Reviewing files that changed from the base of the PR and between ebc24bf and c4b4c24.

📒 Files selected for processing (2)

• lib/index.js
• src/main.ts

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[Copilot]

Pull request overview

This PR tightens the GitHub Action’s commit behavior so it only reports committed=true when simple-git returns a non-empty commit SHA, avoiding false-positive “success” signals for no-op commits.

Changes:

• Add a guard to treat an empty data.commit as a failure instead of reporting committed=true.
• Update the compiled runtime bundle (lib/index.js) to include the same empty-SHA protection.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/main.ts	Adds an explicit empty-SHA check after git.commit() before setting commit-related outputs.
lib/index.js	Updates the built distribution output to reflect the empty-SHA check at runtime.

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