fix: default srcDir to project root instead of non-existent src/ subdirectory

[jesseturner21]

Description

The agentcore package command fails with Error: Required project file not found: .../app/MyAgent/src because resolveProjectPaths and resolveProjectPathsSync in helpers.ts default srcDir to 'src' relative to the agent's code directory. However, all agent templates (Strands, LangChain, CrewAI, GoogleADK, OpenAIAgents) place source files directly in the agent directory (e.g. app/MyAgent/main.py), not in a src/ subdirectory.

The fix changes the default from 'src' to '.' so that srcDir correctly resolves to the agent code directory itself. The srcDir option in PackageOptions still allows callers to override this if needed.

Related Issue

Closes #311

Documentation PR

N/A — no documentation changes needed.

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

End-to-end manual testing:

• agentcore create --name TestAgent --defaults → agentcore package → produces valid zip with main.py, model/, mcp_client/ at the root
• agentcore create with --framework LangChain_LangGraph → agentcore package → produces valid zip
• Added a second agent via agentcore add agent → agentcore package → both agents packaged successfully
• agentcore package --agent <name> → works for individual agent targeting
• agentcore validate → passes on all test projects

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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terms of your choice.

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	42.74%	3810 / 8913
🔵	Statements	42.32%	4017 / 9491
🔵	Functions	44.04%	740 / 1680
🔵	Branches	44.77%	2527 / 5644

Generated in workflow #935 for commit 2fe5b66 by the Vitest Coverage Report Action

[tejaskash]

LGTM 🚀