chore: migrate audit bridge to AIAuditBridge

[Pigbibi]

Summary

• Switch shadow signal dispatch defaults/tests to QuantStrategyLab/AIAuditBridge.

Validation

• git diff --check
• python3 -m pytest tests/test_dispatch_shadow_signal_workflow.py tests/test_post_shadow_signal_request.py -q

[github-actions]

🤖 Codex PR Review

⚠️ Review skipped: The Codex review could not be completed.

No Codex service URL or API key configured. Set CODEX_AUDIT_SERVICE_URL, ANTHROPIC_API_KEY, or OPENAI_API_KEY.

Please ensure a human reviewer checks this PR before merging.

[chatgpt-codex-connector]

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Reviewed commit: e30c89fd33

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[chatgpt-codex-connector]

Scope the app token to the new bridge repo

When CROSS_REPO_GITHUB_APP_ID and CROSS_REPO_GITHUB_APP_PRIVATE_KEY are configured, the workflow creates APP_TOKEN for the hard-coded CodexAuditBridge repository below, but this changed default dispatch target to QuantStrategyLab/AIAuditBridge. The dispatch step prefers APP_TOKEN over CODEX_AUDIT_DISPATCH_TOKEN, so scheduled/default runs in that environment will call the AIAuditBridge workflow with a token scoped to the old repo and fail authorization instead of dispatching the bridge.

Useful? React with 👍 / 👎.