fix: make resources field optional with empty default in AgentDefinition

[Chibionos]

Summary

• Makes resources field optional in AgentDefinition by adding default_factory=list
• Bumps version to 2.2.42

Problem

The resources field in AgentDefinition was defined as a required field without a default value:

resources: List[AgentResourceConfig]  # Required - no default

This caused validation errors when loading agent.json files that don't include a resources array:

pydantic_core._pydantic_core.ValidationError: 1 validation error for AgentDefinition
resources
  Field required [type=missing, loc: ('resources',), msg: Field required]
  For further information visit https://errors.pydantic.dev/2.12/v/missing

Root Cause

In commit 7016737 ("fix: agent resources discriminator"), the AgentDefinition model was refactored from separate LowCodeAgentDefinition and CodedAgentDefinition classes into a unified model. During this refactor, the resources field was made required without a default value.

Solution

Add default_factory=list to the resources field, matching the pattern already used by features:

# Before (required)
resources: List[AgentResourceConfig]

# After (optional with empty default)
resources: List[AgentResourceConfig] = Field(default_factory=list)

Impact

This fix restores backward compatibility for:

• Older agent.json files created before resources were added
• Coded agents that don't specify resources
• Simple agent definitions without tools/context/escalation

Test plan

• Verify existing tests pass
• Verify agent.json files without resources field load successfully
• Verify agent.json files with resources field still work correctly

🤖 Generated with Claude Code

[radu-mocanu]

uv lock needs has to be regenerated for the lint step to pass