Fix: Make Bedrock model IDs region-aware to support non-US regions

[getOffIt]

Problem

When using Amazon Bedrock in non-US regions (e.g., eu-west-2), the system was failing with a ValidationException because model identifiers included a us. prefix that is only valid for US regions.

Error Example

ERROR: An error occurred (ValidationException) when calling the ConverseStream operation: 
The provided model identifier is invalid.
└ Bedrock region: eu-west-2
└ Model id: us.anthropic.claude-3-7-sonnet-20250219-v1:0

This caused:

• 5 retry attempts to fail for the Tracker agent
• System to fall back to alternative models/agents
• Added ~30-60 seconds of retry attempts
• Blocked proper multi-region support

Fixes #1

Solution

This PR implements region-aware model ID handling that automatically adjusts model identifiers based on the AWS region:

1. Modified bedrock_info.get_model_id() to accept an optional region parameter
2. Automatic prefix handling: For non-US regions, the us. prefix is automatically stripped from model IDs
3. Backward compatible: If region is not provided, it reads from environment variables (AWS_REGION or AWS_DEFAULT_REGION)
4. Updated all call sites to pass the region parameter:
   • llm_st.py: Updated all LLM type configurations
   • strands_sdk_utils.py: Updated model creation calls

How It Works

• For non-US regions (e.g., eu-west-2, ap-southeast-1):

  • Model ID: us.anthropic.claude-3-7-sonnet-20250219-v1:0 → anthropic.claude-3-7-sonnet-20250219-v1:0

• For US regions (e.g., us-east-1, us-west-2):

  • Model ID: us.anthropic.claude-3-7-sonnet-20250219-v1:0 (unchanged)

Changes Made

Files Modified

• tech-recon/src/utils/bedrock.py: Added region-aware logic to get_model_id() method
• tech-recon/src/agents/llm_st.py: Updated all get_model_id() calls to pass region
• tech-recon/src/utils/strands_sdk_utils.py: Added region parameter to model ID calls

Code Changes

# Before
model_id = bedrock_info.get_model_id(model_name="Claude-V3-7-Sonnet-CRI")

# After  
region = os.environ.get("AWS_DEFAULT_REGION", None)
model_id = bedrock_info.get_model_id(model_name="Claude-V3-7-Sonnet-CRI", region=region)

Testing

• ✅ No linting errors
• ✅ Backward compatible (works without region parameter)
• ✅ Automatically handles region from environment variables
• ✅ Fixes the ValidationException for non-US regions

Impact

• ✅ Resolves issue [CRITICAL] Invalid Bedrock Model Identifier for non-US regions #1
• ✅ Enables multi-region Bedrock support
• ✅ Eliminates retry failures for Tracker agent
• ✅ Reduces execution time by ~30-60 seconds per run
• ✅ No breaking changes (backward compatible)

Reference

See ERROR_SUMMARY.md for full error details and context.