feat(dataflows): add vendor registry pattern for extensible data vendor routing - Fixes #11
Implements [DATA-10] Interface routing - add new data vendors with:
- VendorRegistry: Thread-safe singleton for centralized vendor registration
- VendorCapability enum: STOCK_DATA, FUNDAMENTALS, NEWS, MACROECONOMIC, etc.
- BaseVendor ABC: 3-stage lifecycle (transform_query, extract_data, transform_data)
- SimpleVendor: Wrapper for migrating existing vendor functions
- Decorators: @register_vendor, @vendor_method, @rate_limited, @with_retry, @cache_result
- RateLimiter: Thread-safe sliding window rate limiting
- 84 tests covering registry, base vendor, and decorators
Files:
- tradingagents/dataflows/vendor_registry.py (253 lines)
- tradingagents/dataflows/base_vendor.py (222 lines)
- tradingagents/dataflows/vendor_decorators.py (188 lines)
- tests/unit/dataflows/test_vendor_registry.py (30 tests)
- tests/unit/dataflows/test_base_vendor.py (27 tests)
- tests/unit/dataflows/test_vendor_decorators.py (27 tests)
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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