Auto-assign on fork PRs via pull_request_target

[bharvey88]

Standardize auto-assign so it runs on PRs opened from forks.

The auto-assign workflow triggers on pull_request (or skips forks via an if: guard), so fork-submitted PRs never get auto-assigned — fork pull_request runs only receive a read-only GITHUB_TOKEN. This switches to pull_request_target, drops the fork-skip guard, and pins the assignee to bharvey88.

pull_request_target runs in the base-repo context with a write token. Safe here because the workflow never checks out or executes PR code — it only assigns.

Targeting the default branch (main) because GitHub runs the auto-assign workflow from the default branch for issues / pull_request_target events; a fix only on beta would stay inert. Matches ApolloAutomation/MSR-2#84.

🤖 Generated with Claude Code

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 57d24c92-4a53-4ddf-bb97-ef5810cd3ee4

📥 Commits

Reviewing files that changed from the base of the PR and between 0b39a6e and bcd11b0.

📒 Files selected for processing (2)

• .github/workflows/autoassign.yml
• .github/workflows/label-check.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/autoassign-fork-prs

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