[codex] Add Telegram anti-martingale execution policy

[LimiNode]

Summary

• add opt-in Telegram anti-martingale sizing driven only by terminal broker TradeResult updates
• keep one pending trade per chat/topic/symbol/direction/strategy group and reject later signals until the result arrives
• bound progression by an explicit multiplier, maximum winning steps, and maximum amount; reset on every non-WIN terminal result
• reject the incompatible source-side CONTIGUOUS_STEPS policy and document the result-authoritative contract
• reserve anti-martingale signal_id state before callback dispatch so synchronous broker results cannot be lost
• keep dedupe and money-management reservations fail-closed when a callback throws after an ambiguous handoff

Validation

• telegram_signal_bridge_test (18/18)
• telegram_signal_parser_test (28/28)
• bridge_umbrella_include_test (8/8, MinGW with -Wa,-mbig-obj)

Stack

This draft is stacked on #143 (feat/telegram-timing-martingale) and should merge after it.