[Roxas2712]

Add the source-facing volatile(mon) contract to the live native Gen2 model: confusion, flinch, Endure, recharge, protection counters, Focus Energy and X Accuracy address the actual shared-controller battler. Cache views on the transient model and retire withdrawn wrappers, avoiding LuaJIT weak-key closure retention and party/serialized view state. GSC counter retention follows actual protection effects rather than IDs.

Depends on #351 (native model), #390 (priority) and the established native-mod host prerequisite #124. This older-host branch is independently exercised; it does not depend on the fork-only semantic-checkpoint backend. The compare against upstream main includes the still-unmerged priority/model prerequisites; the new delta is the volatile bridge and fixture.

Validation on this offered branch: 423/423 real native state/mechanics/ownership checks, 262/262 model checks, 83/83 priority checks. Actual API2 consumer; Gold/Silver/Crystal, Prism and Polished Crystal. A separately executed frozen Gen1 model comparison on this offered source passes 108 field/admission checks with unchanged reference hashes. GPU, unchanged-mod, complete source-model and release acceptance remain open. Protection RNG/opponent-first/Substitute mechanics are explicitly separate work.

Contributions by Roxas2712 — https://github.com/Roxas2712. These original integration contributions are offered to Cedric / UNDERdecoded under the specific PR permission in https://github.com/Roxas2712/Gen2Recomped/blob/main/LICENSE-ROXAS2712.md, including visible credit and preservation of existing licences; earlier/third-party permissions remain intact.