* feat: add extract_json() utility for robust LLM JSON parsing
Handles DeepSeek R1 <think> blocks, markdown code fences, and
preamble/postamble text that LLMs wrap around JSON output.
Applied to macro_synthesis, macro_bridge, and CLI scan output.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
* feat: opt-in vendor fallback — fail-fast by default (ADR 011)
Silent cross-vendor fallback corrupts signal quality when data contracts
differ (e.g., AV news has sentiment scores yfinance lacks). Only methods
with fungible data contracts (OHLCV, indices, sector/industry perf,
market movers) now get fallback. All others raise immediately.
- Add FALLBACK_ALLOWED whitelist to interface.py
- Rewrite route_to_vendor() with fail-fast/fallback branching
- Improve error messages with method name, vendors tried, and exception chaining
- Add 11 new tests in test_vendor_failfast.py
- Update ADRs 002 (superseded), 008, 010; create ADR 011
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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