fix: ensure agentcore create exits after completion in non-interactiv…

[notgitika]

…e mode (#199)

Closes #199

Description

When running agentcore create with --json flag, the process hangs instead of exiting after completion. Three issues were fixed:

1. --json and --dry-run flags now route to CLI mode (matching the deploy command pattern) instead of falling through to TUI mode
2. The standalone TUI auto-exits after successful project creation — the isInteractive guard on the auto-exit useEffect was preventing this
3. handleCreateTUI's onExit callback now calls process.exit(0) after unmounting (matching the deploy command pattern)

Related Issues

#199

Documentation PR

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:all
• 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

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]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	7.26%	473 / 6514
🔵	Statements	6.93%	481 / 6931
🔵	Functions	4.25%	57 / 1341
🔵	Branches	5.15%	194 / 3760

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