fix: add MongoDB AWS auth extra

[scale-ballen]

Summary

• switch Agentex backend dependency from plain pymongo to pymongo[aws]
• update uv.lock with pymongo-auth-aws and AWS SDK dependencies required for MONGODB-AWS auth

Context

This is the app-side dependency needed for the SGP DocumentDB IAM auth migration. Without this extra, PyMongo cannot authenticate using authMechanism=MONGODB-AWS.

Testing

• uv lock --check

Greptile Summary

This PR switches the agentex backend's PyMongo dependency from plain pymongo to pymongo[aws], enabling the MONGODB-AWS authentication mechanism needed for the SGP DocumentDB IAM auth migration. The uv.lock is updated to pull in pymongo-auth-aws 1.3.0 and its transitive AWS SDK dependencies (boto3, botocore, jmespath, s3transfer).

Confidence Score: 5/5

Safe to merge — minimal, targeted dependency change with no logic modifications.

The PR makes exactly one semantic change (adding the aws extra to pymongo) and the lock file is a verified (uv lock --check) mechanical consequence. No application logic, configuration, or security boundaries are altered. All new packages come from PyPI with recorded hashes.

No files require special attention.

Important Files Changed

Filename	Overview
agentex/pyproject.toml	Single-line change: adds the aws extra to the pymongo dependency to enable MONGODB-AWS authentication; version constraints unchanged.
uv.lock	Lock file updated to resolve pymongo[aws]: adds pymongo-auth-aws 1.3.0 and its transitive deps (boto3 1.43.1, botocore 1.43.1, jmespath 1.1.0, s3transfer 0.17.0); all hashes and metadata are present.

Sequence Diagram

sequenceDiagram
    participant App as Agentex Backend
    participant PyMongo as pymongo[aws]
    participant AuthAWS as pymongo-auth-aws
    participant Boto3 as boto3/botocore
    participant DocDB as DocumentDB (IAM)

    App->>PyMongo: connect with MONGODB-AWS mechanism
    PyMongo->>AuthAWS: negotiate AWS authentication
    AuthAWS->>Boto3: fetch IAM credentials from instance profile
    Boto3-->>AuthAWS: temporary credentials bundle
    AuthAWS-->>PyMongo: signed auth payload
    PyMongo->>DocDB: authenticate via IAM token
    DocDB-->>App: connection established

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