configure-agent-pr-attestation

Use when asked to set up PR attestation, install harness-scs attestation hook, configure agent attestor, troubleshoot why agent attestation isn't uploading, or reconfigure an existing attestation hook (different SCM, new cosign key, updated Harness identity). Trigger phrases: set up PR attestation, install harness-scs attestation hook, configure agent attestor, why isn't my agent attestation uploading, set up agent…