feat: add field descriptions and validation for agent creation from template

[hyacinthus]

This PR adds Pydantic field descriptions to AgentCreationFromTemplate and includes extra_prompt validation in AgentUpdate.

Changes

• Added field descriptions to all fields in AgentCreationFromTemplate for better API documentation
• Added extra_prompt to the field validator in AgentUpdate to prevent level 1 and level 2 headings
• Updated tests to verify the new optional fields are correctly passed through

[Copilot]

Pull request overview

This PR enhances the agent creation from template functionality by adding comprehensive field descriptions for better API documentation and extends validation to prevent level 1 and level 2 markdown headings in the extra_prompt field.

Key Changes:

• Added Pydantic field descriptions to all fields in AgentCreationFromTemplate for improved API documentation
• Extended field validation in AgentUpdate to include extra_prompt for heading restrictions
• Updated tests to verify optional fields (readonly_wallet_address, weekly_spending_limit, extra_prompt) are correctly passed through

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
intentkit/core/template.py	Added PydanticField descriptions to AgentCreationFromTemplate fields for better API documentation
intentkit/models/agent.py	Extended field validator to include extra_prompt for preventing level 1 and level 2 markdown headings
tests/core/test_template.py	Added test assertions to verify optional fields are correctly passed through when creating agents from templates
CHANGELOG.md	Added version 0.8.41 release notes documenting new features and improvements

Comments suppressed due to low confidence (1)

intentkit/models/agent.py:830

• This import of module re is redundant, as it was previously imported on line 6.

        import re

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[Copilot]

The extra_prompt field in AgentCreationFromTemplate should have validation to prevent level 1 and level 2 headings (lines starting with "# " or "## "), consistent with the validation applied to extra_prompt in AgentUpdate. Without this validation, users could create agents from templates with invalid extra_prompt content that bypasses the heading restrictions enforced elsewhere in the system.