[Roxas2712]

The generic link codec rebuilds native GBA Pokémon from the older DV/stat-experience fields. It drops PID, IVs, EVs, nature, ability slot and secret trainer ID. A clean #215 negative control loses all six fields and changes the example's maximum HP from 92 to 67.

Dispatch GBA party serialization to a separate versioned codec. Preserve six-stat investments, personality, selected valid ability slot, original-trainer identity, PP-Ups/current PP, item/ball, friendship, contest/origin data, ribbons, language, markings, Pokerus and extension namespaces. Rebuild stats/nature/gender from authoritative data; auto-level heals HP/status while retaining genotype. Keep both public gender.roll entry points and preserve the native toxic/sleep representation.

Advertise native party revision 1 and refuse older/different codecs before trade or battle party exchange, in either role. Hash the codec revision and include native genotype in active/bench state components. Older-generation codecs/digests stay unchanged. The raw GBA fixture changes from 3a76cc5fce47a5c3 to 2fd444270c3d90db, independently audited using the unchanged #215 hasher plus the explicit new surface token. No golden is reblessed.

This stacks on #215. Gen1 remains an unchanged read-only reference; no Gen1 changes or publication.

Validation on clean feature b1795a79cb03a4de7171d50db93a39ce49dddd64:

• 194,843 focused checks pass: 194,540 shared codec/hook checks and 303 transport/trade/link checks.
• 80 workers / 59,394 paired observations agree with unchanged Gen1 535a5ec088c1ae1bf4d91dd3e35a56f64cf46d91. All prior modes remain. The new actual-codec matrix covers 25 natures; levels 1/35/100 plus forced levels; alternate/single abilities; Shedinja; zero/max/mixed IVs/EVs; canonical/raw/translated registries; native metadata and five public gender-hook policies. Only explicit engine ID/stat-key/gender-code schemas are mapped; no compared observations/calls are removed.
• Full ROM-free run: 100/109 engine suites, SDK 3/3 and B30 pass. The exact Counter of all 25 inherited FAIL lines across nine suites equals clean Align native GBA accuracy and post-hit chance commands #215 (98/107). The combined fork carries their separate repairs.
• Strict malformed packets return named failures without crashing. JSON/save round trips, actual two-role trade negotiation/application, invalid-row cancellation and older-peer controller refusal are tested.
• Two complete seeded native-genetics link mirrors verify original sender genotype as well as every completed paired turn hash/state component. Matching equally degraded peer copies would not satisfy these tests.
• Actual locally imported FireRed/Emerald Poliwag records round-trip all IVs/EVs/stats, selected ability, secret ID/current PP and public API-3 TOX/personality reads in a CPU-only smoke. No imported data/assets/saves are published.
• Scoped StyLua, actionlint and whitespace checks pass. Original failed/negative reports are retained.

The packet contract is engine-local, with explicit schema mapping in comparisons; this does not assert cross-engine network packet compatibility. Full native egg-legality checks, other-generation codecs, timed side/volatile producers, whole-game RNG/VBlank scheduling and demo controller playback remain separate. No live UI/full-playthrough claim. Reproduction commands and limits are in docs/native-gen3-party-codec.md.

Combined fork acceptance: clean runtime abeaf23461ee80e95a7ff0f9cfd98bb5e5075062 passes 224/224 engine suites, SDK 3/3 and B30. All 80 workers / 59,394 paired observations remain identical there, and the actual imported FireRed/Emerald party smoke also passes. The documented snapshot is pushed as d0e5b52ef2857a7d2eee8c7e662cf38e95d9f46d to Roxas2712/Gen2Recomped:codex/portability-testing. Fork main remains 13af468b.

All seven hosted workflows currently require maintainer approval (action_required). The dedicated contract run has zero jobs. Local acceptance does not claim hosted execution. The app's 100-artifact limit prevented another PR attachment; the regular PR remains published and linked.