feat: add JSON schema generation from Zod

[Hweinstock]

Description

Adds tooling to generate a JSON Schema from the Zod AgentCoreProjectSpecSchema, using Zod v4's built-in toJSONSchema. The generated schema enables IDE autocomplete and validation for agentcore.json files.

See demo internally.

Notes:

• trusting the domain will be required until we are in a trusted catalog, ex https://github.com/SchemaStore/schemastore. However, its pretty easy for customers to figure out.
• the branch suffix in the schema url is only used to test serving the schema from this branch, in production it will be schema.agentcore.aws.dev/v*.
• we are not yet pushing it into generated projects automatically until we are ready to release to customers and the schema is ready to be served from mainline.
• schema generation is currently a manual process, but eventually we should combine it with release. The risk is that committing a change IS releasing a change to customers, so we guard this process behind PR for now.

Related Issues

N/A

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 typecheck
• I ran npm run lint

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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Coverage Report

Status	Category	Percentage	Covered / Total
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🔵	Statements	45.22%	6831 / 15106
🔵	Functions	44.38%	1153 / 2598
🔵	Branches	45.57%	4197 / 9208

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