fix: pull-requests write permission for sync-prs-to-linear

[dielduarte]

Adding labels to PRs via the issues API requires pull-requests: write. Was set to read which caused the action to fail with 'Resource not accessible by integration'.

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Summary by cubic

Grant pull-requests: write in the sync-prs-to-linear workflow so it can add PR labels via the Issues API and stop “Resource not accessible by integration” failures. Also bump the resend/public-shared-workflows action reference.

^{Written for commit 744cbd3. Summary will update on new commits.}

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Latest commit: 744cbd3

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[cubic-dev-ai]

No issues found across 1 file

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Auto-approved: This change grants the necessary pull-requests: write permission to a GitHub Actions workflow so it can add labels to PRs via the Issues API, fixing a known failure; the diff is small, well-explained, reviewed by an AI with no issues, and does not affect other parts of the system.}

[cubic-dev-ai]

0 issues found across 1 file (changes from recent commits).

_{Auto-approved: The PR bumps the pull-requests permission from read to write in the sync-prs-to-linear workflow, which resolves a failure when adding labels to PRs via the Issues API, and updates the reusable action reference; this is a small, isolated configuration change with no impact on business logic or}