refactor: consolidate cli-config into global-config

[Hweinstock]

Description

cli-config.ts and global-config.ts both read/write ~/.agentcore/config.json with separate schemas and I/O. This consolidates them into a single owner (global-config.ts) with a Zod schema covering all fields.

• Moved global-config.ts to src/lib/schemas/io/
• Added readGlobalConfigSync for callers that want sync reads (build-args.ts, post-deploy-observability.ts)
• Migrated both callers from readCliConfig to readGlobalConfigSync
• Deleted cli-config.ts
• Added tests for readGlobalConfigSync

Related Issue

Follow-up to #797

Documentation PR

N/A

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Other (please describe): Internal refactor — consolidate two modules reading the same config file

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

Verified: readGlobalConfigSync covers happy path (parsed config) and error paths (missing file, malformed JSON). Post-deploy-observability tests pass with updated mock target. Zero remaining references to readCliConfig or cli-config.ts.

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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[github-actions]

Package Tarball

aws-agentcore-0.7.1.tgz

How to install

npm install https://github.com/aws/agentcore-cli/releases/download/pr-802-tarball/aws-agentcore-0.7.1.tgz