[Roxas2712]

Depends on #106 and its API ancestors. Merge those first and rebase before merging. Isolated implementation: b191fdcc3d904e51619e250f0c984236e8980aed (focused diff).

Enable mod.world:invalidateMap(mapId) for API-3 generations 1–3. Validate map identifiers and Gen3 aliases; reuse the NPC/object/block idle-world, owner-lease and reentry guards. Dispatch through the existing native reloadMap path, preserving target/neighbor cache eviction, seamless active reload with player coordinates/facing/music, and the native heal-point fallback when the new geometry cannot contain the player. Inactive invalidation does not relocate the player. Gen4/5, API-1/2 and portable script verbs remain unchanged.

All 24 world method names in the pinned Gen1 API-3 facade now have host adapters for generations 1–3. This is availability, not identical internals or a promise of complete native behavioral equivalence. Native flags and version datasets remain follow-up work.

Contract and reproduction. Retain native lifecycle semantics: host emits map.reloaded on accepted inactive invalidation; pinned Gen1's Gen2 backend does not. Native failure can happen after cache eviction and is not transactional rollback.

Validation

• 148/148 targeted checks: real host OverworldState.reloadMap and MapLoader.invalidate with synthetic cache/setMap seams; target/neighbor eviction, current coordinates/facing/music, geometry fallback, malformed/busy requests, failure/guard release, reentry and retired owners.
• 64 cross-engine comparisons /128 isolated loader runs at clean feature head, pinned Gen1 79ea62f45fb2ea8f65d081a109431e4eb1bbdb36. Eight new identical public-only fixture cases run under both loaders for Red, Blue, Yellow, Gold, Silver, Crystal, FireRed and Emerald. Compare validation, active reload, notification and inactive acceptance; no engine imports/backend branches in the mod.
• Full ROM-free tests: 81/91 engine, SDK 3/3, B30 PASS. Fresh Add API 3 public NPC actions with cross-engine contracts #105 baseline79/89; previous Add guarded API 3 wild encounters and shared contracts #106 80/90. All 27 complete FAIL lines match the baseline exactly, in order.
• All-PR integration through Add guarded API 3 wild encounters and shared contracts #106 plus this commit (1bf94ae7345a31a1fc9a9e0a2df21c292087bced): 86/96 engine, SDK3/3, B30 PASS; identical baseline failures. The same 64 comparisons /128 runs pass on the clean integration tree.
• Changed Lua formatting and diff checks pass. Native rendering is an instrumented seam; no ROM gameplay/render equivalence is claimed. Existing API-3 CI includes invalidate mode automatically.

The unchanged failing suites are gate_fingerprint, gate_meta_coverage, quit_thread_shutdown, rebind_capture_bug510, rebind_swap_clear_bug589, soft_reset_bug563, tool_mod_hooks, update_check_tests, update_tests and wide_battle_layout; full test entry therefore remains nonzero.

Hosted CI

Published open/non-draft at the tested head. API 3 contracts and ci currently conclude action_required pending maintainer fork-workflow approval. Hosted CI is not green; the validation above ran locally.