fix: harden rolling PR workflow fallback

[namastex888]

Summary

• keep github.token for read-only rolling PR discovery
• handle main...dev compare failures as warnings instead of red scheduled runs
• use RELEASE_PLEASE_TOKEN only for PR creation, after presence/auth validation
• convert PR-create failures into warnings so stale/missing custom tokens do not keep the repo red

Live finding fixed

Workflow dispatch of PR #105 still failed because this org does not permit github.token to create PRs, and main...dev compare returned 404 before PR creation.

Verification

• PyYAML parsed .github/workflows/rolling-pr.yml
• extracted workflow shell passed bash -n
• npm run check
• git diff --check
• independent review: no real security issues; duplicate-PR guard is preserved

[gemini-code-assist]

Note

Gemini is unable to generate a review for this pull request due to the file types involved not being currently supported.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 7c3dcbf9-3e06-44fd-b72a-9463de1d8df1

📥 Commits

Reviewing files that changed from the base of the PR and between 71c1999 and 8bd02ca.

📒 Files selected for processing (1)

• .github/workflows/rolling-pr.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch drogo/harden-rolling-pr-dispatch

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