fix: use paths_released and version outputs for immutable releases

[thoroc]

Problem\nWhen using skip-github-release: true to prevent release-please from creating the release (needed for immutability), the release_created output is never set to true. This caused the build_and_upload and create_release jobs to be skipped, resulting in releases without binaries.\n\n## Solution\nUse the correct outputs when skip-github-release: true:\n- paths_released - indicates a release should happen (set to ["."] for root releases)\n- version - the version number to construct the tag (e.g., v0.4.5)\n\n## Changes\n- Changed condition from release_created == 'true' to paths_released != '[]'\n- Changed tag_name from output to constructed: v${{ version }}\n\nThis ensures the workflow runs when a release is needed and creates the release atomically with all built binaries.

[github-actions]

@github-copilot Please review this PR focusing on:

1. Code quality, best practices, and potential bugs
2. Security vulnerabilities and unsafe patterns
3. Performance implications
4. Documentation accuracy and completeness
5. Test coverage and edge cases

Please provide specific, actionable feedback.