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## What changed - Expose `aws_sigv4` actions in version 2 MITM permissions configuration and the config schema, rejecting multiple signing actions per hook. - Give local managed commands placeholder AWS credentials for the selected signing pair, and mask configured credentials in environment values and protected shell snapshots. - Set `AWS_CA_BUNDLE` to the managed proxy CA bundle when unset, and require `features.credential_masking` for local AWS signing hooks. - Validate placeholders against every configured signing pair to prevent overlap with real credentials. ## Testing Extend configuration, signing, and TLS forwarding tests to cover action resolution, invalid signing configuration, credential masking, CA trust, snapshot protection, and exclusion of local AWS defaults from remote environments. GitOrigin-RevId: 81dfdea30ebde74829882b38891ea41e9737058a