Fix AWS Bedrock tool calling compatibility

[pragyan-amp]

Fixes tool calling issues with AWS Bedrock by addressing three schema incompatibilities:

1. Remove empty required arrays - AWS Bedrock rejects tool schemas with required: []
2. Strip unsupported JSON Schema keywords - Remove default, minimum, maximum (Bedrock only supports: type, properties, required, items, enum, description)
3. Standardize tool names to underscores - Amazon Nova Pro does not support hyphens in tool names

Also upgrades all dependencies to latest versions (OpenAI 1.76.0 → 2.7.1, Databricks SDK 0.50.0 → 0.73.0, etc.)

Testing

• ✅ All 623 unit tests passing
• ✅ Verified with real AWS Bedrock API calls
• ✅ Tool calling now works correctly with Amazon Nova Pro

Commits

• fix: AWS Bedrock tool calling compatibility
• refactor: standardize command names to use underscores
• chore: upgrade dependencies to latest versions