ci: grant pull-requests:read so lint-pr-title workflow starts

[kinyoklion]

Requirements

• I have added test coverage for new or changed functionality — N/A (CI workflow change only)
• I have followed the repository's pull request submission guidelines
• I have validated my changes against all supported platform versions — N/A (CI workflow change only)

Related issues

• Root cause: launchdarkly/gh-actions#86 added permissions: pull-requests: read at the job level inside the reusable lint-pr-title workflow
• Same fix as launchdarkly/sdk-meta#429

Describe the solution you've provided

Adds permissions: pull-requests: read at the workflow level in .github/workflows/lint-pr-title.yml.

A reusable workflow can only request a subset of the permissions the caller has granted. Since this caller had no permissions block, the reusable workflow's pull-requests: read request could not be satisfied, causing every run to hit startup_failure.

Describe alternatives you've considered

Reverting the permission declaration in the reusable workflow itself, but that would remove a security improvement (least-privilege scoping) across all consumers.

Additional context

No product code is changed. The Lint PR title check on this PR itself should exit success rather than startup_failure, confirming the fix.

Link to Devin session: https://app.devin.ai/sessions/c7b96da5c9074500aa684bc9a9ba1c31
Requested by: @kinyoklion

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Note

Low Risk
Low risk: CI-only change that expands workflow permissions to pull-requests: read so the reusable lint-pr-title workflow can run; no product code or data paths are affected.

Overview
Fixes the Lint PR title GitHub Actions workflow startup failure by explicitly granting workflow-level permissions: pull-requests: read, allowing the called reusable lint-pr-title workflow to request and use PR read access.

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