fix: exclude bot reviewers from Review Stacks

[coji]

Summary

• Review Queue: getPendingReviewAssignments で Bot タイプのレビュアーを除外。copilot-pull-request-reviewer 等が表示されなくなる
• Unassigned 判定: hasAnyReviewer サブクエリでも Bot を除外。Bot のみアサインされた PR は「レビュアー未アサイン」として Unassigned に表示される

Test plan

• 既存テスト通過（aggregate-stacks.test.ts）
• typecheck 通過
• トレカセンターの Review Stacks で copilot-pull-request-reviewer が消えていることを確認
• Bot のみアサインの PR が Unassigned に表示されることを確認

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 204af0ce-38e6-4701-b571-6d6df7fc07b4

📥 Commits

Reviewing files that changed from the base of the PR and between a520ede and 5c254e2.

📒 Files selected for processing (6)

• app/libs/tenant-query.server.ts
• app/routes/$orgSlug/analysis/reviews/+functions/queries.server.ts
• app/routes/$orgSlug/throughput/deployed/+functions/queries.server.ts
• app/routes/$orgSlug/throughput/merged/+functions/queries.server.ts
• app/routes/$orgSlug/throughput/ongoing/+functions/queries.server.ts
• app/routes/$orgSlug/workload/+functions/stacks.server.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/exclude-bot-from-review-stacks

📝 Coding Plan

• Generate coding plan for human review comments

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