feat: add streamDeliveryResources schema, CLI flags, and validation for memory record streaming

[Hweinstock]

NOTE: Do not merge, dependent on unreleased CDK changes.

Description

Problem

Customers have no way to receive real-time notifications when memory records change, forcing them to poll APIs to detect new data.

Solution

Added streamDeliveryResources support to agentcore add memory, allowing customers to configure push-based delivery of memory record events to a target (e.g. Kinesis Data Stream).

• CLI flags: --data-stream-arn, --stream-content-level, --delivery-type
• Advanced input: --stream-delivery-resources for inline JSON.
• Docs: added Memory Record Streaming section to docs/memory.md

Depends on a corresponding CDK construct change.

Related Issue

Closes #528

Documentation PR

N/A

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Other (please describe):

Testing

How have you tested the change?

• I ran npm run test:unit and npm run test:integ

• I ran npm run typecheck

• I ran npm run lint

• If I modified src/assets/, I ran npm run test:update-snapshots and committed the updated snapshots

• agentcore add memory with --data-stream-arn and --stream-content-level flat flags — config written correctly to agentcore.json

• agentcore add memory with --stream-delivery-resources inline JSON — config written correctly

• agentcore deploy — stack deployed successfully and created memories with streams.

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• My changes generate no new warnings
• Any dependent changes have been merged and published (NO)

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