feat(indexes): add quoted year-on-year inflation index siblings - #866
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Add the quoted year-on-year variants alongside the existing zero inflation indexes, each beside the zero index sharing its C++ header. **New year-on-year indexes:** * Added `YyUkRpi` (`YY_RPI`) in `ukrpi.rs`, mirroring the C++ `YYUKRPI` constructor over a `YoYInflationIndex`. * Added `YyEuHicp` (`YY_HICP`) and `YyEuHicpXt` (`YY_HICPXT`) in `euhicp.rs`, differing from each other in family name alone. * Each is a zero-sized namespace whose `new` returns a plain `YoYInflationIndex` with an empty curve handle, left for `with_term_structure` to link. **Re-exports:** * Exported the new indexes flat from `inflation/mod.rs` and `indexes/mod.rs`. **Tests:** * Added construction tests asserting each index's name, frequency, revised, ratio, underlying index, availability lag and currency. Closes #836
Add `last_yoy_inflation_coupon` on `YoYInflationCapFloor`, porting `lastYoYInflationCoupon` (`.cpp:109-115`). The port holds coupons concrete and `new` refuses an empty leg, so the accessor is infallible where C++ can hand back a null pointer. A three-coupon fixture test confirms the accessor returns the leg's tail rather than its front. Closes #856 close #836
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close #836