Tracked as part of #1365.

Description

The PR Review workflow (pr-review.lock.yml) fails with a secret validation error when triggered by fork PRs, because GitHub never exposes repository secrets to pull_request events from forks.

Example: PR #1296 → Run #24436983830

Acceptance Criteria

• pr-review.md Activation Guard includes a condition that detects fork PRs (github.event.pull_request.head.repo.id != github.repository_id) and calls noop with message "Skipping: fork PR, secrets unavailable." instead of failing.
• Fork PRs no longer produce a failed workflow run for secret validation; they produce a neutral/skipped status instead.
  Related to fix(workflows): Agentic workflows fail when GitHub strips secrets for fork PRs and Dependabot workflow-file PRs #1365

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