[Amber] Fix: [Amber] Claude Opus 4.5 is not available in chat despite being selected when session was created #436
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The frontend stores short model names (e.g., 'claude-opus-4-5') but the Anthropic API requires full model IDs with date suffixes (e.g., 'claude-opus-4-5-20251101'). Previously, model mapping was only applied when using Vertex AI, causing Claude Opus 4.5 and other models to fail when using the direct Anthropic API. This fix: - Adds _map_to_anthropic_model() method to map short names to full IDs - Applies model mapping for both Anthropic and Vertex AI providers - Updates default model format to match Anthropic API convention - Improves logging to distinguish between Anthropic and Vertex mappings - Adds comprehensive test coverage for Anthropic model mapping Fixes #434 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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Automated Fix by Amber Agent
This PR addresses issue #434 using the Amber background agent.
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This PR was automatically generated. Please review:
🤖 Generated with Amber Background Agent
Closes #434