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niksis02
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Add support for AWS-compatible inline identity-based policies on IAM users, implementing the `PutUserPolicy`, `GetUserPolicy`, `DeleteUserPolicy`, and `ListUserPolicies` actions on both the internal and Vault storage backends. - iamapi/policy is a new package that parses and validates policy documents against IAM's parameter-level constraints (max length, allowed charset) and policy grammar (Version, Effect, mutually exclusive Action/NotAction and Resource/NotResource, vendor-prefixed actions, ARN-shaped resources, no Principal/NotPrincipal, unique Sids). - `PutUserPolicy` creates or replaces a named inline policy on a user, enforcing a 2048-byte aggregate quota across all of a user's inline policies (MaxInlinePolicyBytesPerUser), matching the AWS IAM quota. - `GetUserPolicy` returns a policy's document RFC 3986 percent-encoded, matching how real IAM encodes the PolicyDocument response element. - `DeleteUserPolicy` removes a named inline policy from a user. - `ListUserPolicies` returns a paginated, sorted list of a user's inline policy names, honoring Marker/MaxItems like the other IAM list APIs. - `DeleteUser` is now rejected with a DeleteConflict error if the user still has inline policies attached, mirroring the existing access-key delete-conflict behavior.