[Migration] Phase 6: Validation & Cleanup

[aWN4Y25pa2EK]

Overview

Final validation of the hybrid architecture and cleanup of deprecated code.

Parent Epic: #19
Depends on: #20, #21, #22, #23, #24

Acceptance Criteria

• All tests pass with new AI SDK integration
• openai package removed from dependencies
• @opencode-ai/sdk package removed from dependencies
• No dead code remaining from old implementations
• Documentation updated for new architecture
• Performance baseline established

Cleanup Tasks

• Remove openai from package.json
• Remove @opencode-ai/sdk from package.json
• Remove unused imports and type definitions
• Clean up config sections for removed integrations
• Update CLAUDE.md with new architecture notes

Validation Checklist

• E2E test: Full issue analysis pipeline
• E2E test: PR review workflow
• E2E test: Deep reasoning with extended thinking
• Token tracking accuracy across all LLM calls
• Error handling and retry logic
• Rate limiting behavior
• Cost estimation accuracy

Documentation Updates

• Update README with new dependencies
• Document provider registry usage
• Document extended thinking configuration
• Add troubleshooting guide for common issues

Performance Metrics

Capture baseline metrics before closing:

• Average latency per analysis stage
• Token usage per task type
• Error rate comparison
• Cost per task comparison

Final State

After this phase:

• KEEP: @google/adk for agent orchestration
• ADD: ai, @openrouter/ai-sdk-provider
• REMOVE: openai, @opencode-ai/sdk

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Part of Hybrid ADK + AI SDK Migration