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2086e3cca4
Per the maintainer review on #1772/#1773, scope this PR to market detection
and data routing only — no Taiwan stock-index / seed / pool-resolution, so a
bare code can never be silently rewritten to a .TW suffix (the index path is a
deferred follow-up with the jp/kr-style honest doc + entry-point tests).
- data_provider/base.py: _is_tw_market / _is_tw_suffix_stock, _market_tag,
normalize_stock_code, get_daily_data + get_realtime_quote routing,
_DAILY_MARKET_FETCHER_SUPPORT (YfinanceFetcher only), offshore fundamental path
- data_provider/yfinance_fetcher.py: _get_tw_main_indices (^TWII / ^TWOII) +
.TW/.TWO suffix passthrough
- src/core/trading_calendar.py: XTAI / Asia/Taipei + get_market_for_stock
- src/market_context.py: detect_market + Taiwan prompt guidelines
- src/{market_phase_summary, services/stock_code_utils, core/pipeline}: tw plumbing
(stock_code_utils only recognizes .TW/.TWO codes; no bare->suffix rewrite)
- src/services/decision_signal_extractor.py: gracefully skip tw (recognized by
the data layer but not yet supported by the signal service) — no swallowed
ValueError + traceback
- tests: test_tw_market_support.py + test_decision_signal_extractor.py
(test_build_payload_skips_tw_market_gracefully — real tw skip regression)
- docs/market-support.md + CHANGELOG
Deferred follow-ups: stock index/seed + autocomplete + frontend, API market
enums + api_spec, and the service-layer market enums.
Bare numeric codes keep A-share semantics; only an explicit .TW/.TWO suffix
opts into Taiwan.
Refs #1772