fix: stop run-install after install failure

[lyzno1]

Summary

• throw when a vp install command fails so later run-install entries do not continue
• add regression coverage for multi-entry run-install failure handling
• rebuild dist/index.mjs

Verification

• vp run test
• vp run typecheck
• vp run check:fix
• vp run build

Fixes #61

[Copilot]

Pull request overview

This PR updates the run-install step to fail fast: when any vp install invocation fails, the action now throws to stop processing subsequent run-install entries, and includes a regression test to enforce the behavior.

Changes:

• Make runViteInstall throw on vp install failure (non-zero exit code or exec error) to stop the loop immediately.
• Add unit test coverage ensuring subsequent run-install entries are not executed after the first failure.
• Rebuild dist/index.mjs to reflect the updated runtime behavior.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
src/run-install.ts	Switch from setFailed to throwing errors so run-install halts on first failure.
src/run-install.test.ts	Adds regression test asserting the loop stops after the first failed install.
dist/index.mjs	Updated compiled output reflecting the new failure/throw behavior.

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