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

[kinyoklion]

Summary

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

The reusable workflow at launchdarkly/gh-actions/.github/workflows/lint-pr-title.yml@main was updated (launchdarkly/gh-actions#86) to declare permissions: pull-requests: read at the job level. A reusable workflow can only request a subset of the permissions the caller grants, so without an explicit permissions block in the caller, every run hits startup_failure. Same fix as launchdarkly/sdk-meta#429.

Review & Testing Checklist for Human

• Verify the Lint PR title workflow run on this PR exits success rather than startup_failure

Notes

No product code is changed — workflow-only permissions fix.

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

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Note

Low Risk
Low risk workflow-only change that only broadens read access to PR metadata to avoid job startup failures.

Overview
Ensures the Lint PR title workflow can run by explicitly granting pull-requests: read at the workflow level, aligning caller permissions with the reusable launchdarkly/gh-actions lint workflow requirements.

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