Version 6.4.2
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Adds agent model validation, classical intent classifier support, and improvements to the GitHub deployment pipeline.

Features
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**Agent Validation**
- New `Agent.validate()` checks for state/intent name collisions and unresolved intents in transitions.
- `/validate-diagram` now runs actual agent validation.

**Classical Intent Classifier**
- Agent template generates `SimpleIntentClassifierConfiguration` when IC technology is `classical`.
- Render deploy installs PyTorch CPU + scikit-learn only for classical IC.

**Unresolved Intents**
- Transitions referencing undefined intents now create placeholder intents so validation can report them.

Improvements
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**GitHub Deployment**
- Deploy-created repositories now include description, homepage, and topic tags.
- Added `GitHubService.update_repository()` to set repo metadata.
- Improved README template.
- Agent config resolution now also checks project-level `agentConfig`.

**Dependencies**
- Generated `requirements.txt` now pins versions (`==`) for reproducible builds.

Removed
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- Removed `.github/workflows/deploy-wme.yml` (EC2 deployment workflow).