[Roxas2712]

Native GBA Baton Pass currently spends PP and sets wantsSwitch, but leaves its donor active. This also leaves later queued attacks targeting the outgoing Pokémon.

Implement a resumable native replacement choice, stage/volatile transfer, public switch event and native switch-in effects. Players use the real forced party screen; NPCs use the native type heuristic. Linked players transmit their actual mid-turn choice, spectators replay it, and disconnects remain serviced while the picker owns input. Validate buffered/replayed choices, preserve owner-specific/clamped parties, refresh queued targets and defer item phases across nested called moves. Ordinary link screens still follow live or late-installed battle rosters.

Native command revision 3 guards changed battle semantics and hashes transferred special stages/seed ownership. The audited raw fixture changes from cf73a8e083fb8a54 to c2a03195bc4588f9; native party revision and older-generation goldens remain unchanged.

Stacks on #217 and the existing held-item prerequisites #165/#166. Gen1 is an unchanged read-only reference; no Gen1 changes or publication.

Validation on clean feature runtime d5ad56afccca21d107f21b5b561b908fa650e59e (later commits only document acceptance):

• 915 focused Baton Pass checks pass: 654 command, 52 actual party UI, 72 link/spectator/disconnect, 95 packets/signatures/compatibility and 42 authored-effect/called-move checks. Native protocol 154 and existing public UI 3,002 checks also pass.
• 88 workers / 60,132 paired observations agree with clean Gen1 535a5ec088c1ae1bf4d91dd3e35a56f64cf46d91. The new mode retains 156 complete observations per profile: actual resolvers/resumption, all four slots, empty/fainted/egg/reserved members, transferred volatiles and seed identities, one/two/three Spikes layers, called PP semantics, and the actual NPC selector including raw bounded RNG calls and empty PP.
• Full feature run: 110/119 engine suites, SDK 3/3 and B30. The exact Counter of all 25 inherited FAIL lines across nine suites equals clean prerequisite c27c37a667e8a40613c22506448ab4886fc9b431 (105/114). Their independent repairs remain in the combined fork.
• The same public selector on the clean prerequisite fails the actual replacement assertion, leaving the donor active. The initial Baton implementation also fails nested-choice item-phase checks. Original failing/raw reports are retained.
• Actual local FireRed/Emerald imports select canonical BATON_PASS through the public mod and exercise the real party screen/queued turn choosing the third member, retaining stages and spending native PP once. CPU-only; no ROM/cache assets or saves are distributed.
• Combined runtime 86b12d7b7a816a2782ba5cfba804b103630eda5b passes 231/231 engine suites, SDK 3/3, B30, the same 88/60,132 clean-reference comparison and imported smoke. Existing 4,849 party-navigation checks pass.
• Scoped StyLua, actionlint and whitespace checks pass.

See docs/native-gen3-baton-pass.md for commands and schema mappings. These tests do not certify GPU animation, pixel equality, a full playthrough, global RNG/VBlank scheduling or complete native ability/item/side-state parity. Hosted CI status is tracked separately from local acceptance.

The documented combined snapshot is pushed as 907d500d56608a25d2f56d16be9f6563cd9c7fb0 to Roxas2712/Gen2Recomped:codex/portability-testing. Changes after the tested combined runtime only record validation. Fork main remains 13af468b.

All eight hosted workflows currently require maintainer approval (action_required). The dedicated contract run has zero jobs, so local acceptance does not claim hosted execution. The app's 100-artifact cap prevented another attachment; this regular PR remains published and linked.