feat(yahoo): add GB (London Stock Exchange) support to Yahoo Finance data collector#2155

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kaish114 wants to merge 8 commits intomicrosoft:mainfrom

kaish114:feat/add-gb-lse-yahoo-collector

Commits on Mar 14, 2026

feat(data_collector): add GB_ALL to calendar benchmark map and symbol cache
kaish114
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feat(data_collector): add get_gb_stock_symbols via Yahoo Finance screener API
kaish114
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feat(yahoo): add YahooCollector and YahooNormalize classes for GB (LSE) region
kaish114
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docs(yahoo): add GB region usage examples and fix supported regions list
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test(yahoo): add unit tests for GB collector, symbol fetcher, and class resolution
kaish114
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style: apply black formatting (line length 120)
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fix(gb-collector): add inter-page sleep to avoid screener rate limiting
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fix(gb-collector): use simple User-Agent for screener requests
kaish114
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