feat: add Mastra TypeScript framework template

[huanshenyi]

Description

Adds Mastra as a supported TypeScript HTTP framework template for AgentCore agents.

This change wires Mastra through the create/add validation paths, TUI framework options, renderer selection, telemetry framework enum, and asset snapshot coverage. The new template uses @mastra/core with AI SDK providers and provides a working AgentCore Runtime HTTP entrypoint.

Related Issue

Closes #1429

Related to #1207

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

Additional validation:

• Ran npm run build
• Generated a Mastra TypeScript agent and verified local /invocations streaming
• Deployed the generated Mastra project to AgentCore Runtime in ap-northeast-1
• Verified deployed invocation with agentcore invoke --stream --target default --runtime MastraTest "hi"

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

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