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* feat(prices): add Moscow Exchange (MOEX ISS) securities + FX provider Add Provider::MoexPublic, a keyless provider built on the free MOEX ISS API (https://iss.moex.com/iss), modeled on Provider::BinancePublic. Securities: shares, funds/ETF/БПИФ (e.g. LQDT), and bonds (OFZ + corporate). Bonds are priced clean — LAST% × FACEVALUE / 100 in the instrument currency, with per-row FACEVALUE for amortizing issues; NKD/accrued coupon excluded. Exchange rates: also implements ExchangeRateConcept for RUB↔{USD,EUR,CNY} via selt TOM instruments (USD000UTSTOM/EUR_RUB__TOM/CNYRUB_TOM); the selt quote is X/RUB, inverted for RUB→X, nil for non-RUB-crossed pairs. Details: - Board/engine resolution via the ISS primary-board flag with a hardcoded priority fallback (TQBR, TQTF, TQOB, TQCB, …). - Instrument currency from CURRENCYID/FACEUNIT (handles USD/CNY eurobonds & FX funds), normalizing legacy SUR/RUR → RUB; default RUB. - Full history via from/till + start= pagination; current price fallback chain LAST → MARKETPRICE → LCURRENTPRICE → LCLOSEPRICE → PREVPRICE → latest history close. - Bare SECID identity, exchange_operating_mic=MISX, country_code=nil (wildcard like Binance); search accepts .ME/.MOEX/.MISX/.MCX aliases and ISIN. - RateLimitable throttling, SslConfigurable, Faraday retry/timeouts; all public methods wrapped in with_provider_response. Wired into Provider::Registry for both :securities and :exchange_rates, the hosting provider-selection UI, locales, and config/exchanges.yml (MISX). Docker-tested (devcontainer, Ruby 3.4.9): 29 new tests green, full provider suite + i18n green, rubocop clean; smoke-tested against live ISS (SBER price, OFZ clean price, USD/RUB FX). * fix(moex): address review — FX weekend lookback, dead branch, translated hints - fetch_exchange_rate now fetches a 10-day lookback window (not just the exact day) so a weekend/holiday request resolves to the prior trading day's close, matching Yahoo's behavior (Codex P2). - Remove dead identical if/else branches in history_row_price (CodeRabbit). - Translate moex_public_hint into ca/fr/hu/vi/zh-CN instead of English copy (CodeRabbit). - Add a test covering the FX prior-trading-day lookback. * fix(moex): guard ISS date parsing; doc TQTE in board priority Address maintainer review (jjmata): - parse_iss_date wraps Date.parse so a malformed ISS TRADEDATE skips just that row (with a contextual log warning) instead of failing the whole history/FX fetch. Used in history_row_price and fx_history. - Add TQTE to the BOARD_PRIORITY doc comment (it was in the constant but missing from the comment). - Add a test covering the unparseable-date skip.