Add error message display to release workflow step summary

[Copilot]

Release workflow failures were only visible in raw logs. Error messages now display in the GitHub Actions step summary for immediate visibility.

Changes

• Create Release step: Added continue-on-error: true with set -o pipefail to capture error output to /tmp/release_output.txt while preserving exit codes
• Release Summary step: Now runs on both success and failure (if: always()), checks steps.create_release.outcome, and writes formatted status to $GITHUB_STEP_SUMMARY
• On failure: Displays version, tag, and full error details in markdown code block, then exits 1 to fail the workflow
• On success: Displays release details with clickable link

Example Output

When release creation fails (e.g., duplicate tag):

# ❌ Release Creation Failed

**Version:** 0.0.5
**Tag:** v0.0.5

## Error Details

HTTP 422: Validation Failed
release.tag_name already exists

Original prompt

When the release workflow fails, show the error message in the step summary as well. check run logs here: https://github.com/rajbos/github-copilot-token-usage/actions/runs/20699674127/job/59420034711

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