[Roxas2712]

Gen1Recomp mods can poll every interactive frame or pause Game simulation through core.update; Gen2Recomped currently calls Game:update(dt) directly, so registered callbacks never run. Add the matching (next, game, dt) seam through a small PlatformHooks.update helper, plus native capability and unified callback catalog entries.

Depends on #143 and its public-API prerequisites. Merge those first and rebase before merging. This PR's new work is isolated in one commit: implementation-only diff. It does not require the rendering or shader PRs.

Normal interactive frames dispatch once outside the fixed-step loop. Omitting next pauses Game:update while the pausing wrapper and host housekeeping can continue on subsequent frames. next() forwards current arguments; explicit replacement arguments also change the native update target/delta. The hoisted native default discards Game:update results exactly as Gen1 does. Existing hook priority, error, unsubscribe and owner rules remain in force.

The native host boundary is preserved: launcher/importer, editors, boot reports and absent-Game frames bypass the seam. Autopilot and coroutine-driver paths retain their direct deterministic 1/60 updates and bypass the hook, matching Gen1. No wrapper is added to Game:update itself, so these scripted loops do not acquire extra dispatch.

Includes a generic pause/poll example, documentation and a dedicated ROM-free workflow pinned to unmodified Gen1Recomp 79ea62f45fb2ea8f65d081a109431e4eb1bbdb36.

Validation:

• 1,208 focused checks pass: real love.update routing, original Game identity/delta, forwarding, pause/resume, argument replacement, nil-hole results, wrapper/native errors, cleanup and no-mod parity.
• Routing matrix covers all 15 Gen2Recomped host versions in API 1, native/unified API 2 and API 3, including failed/completed drivers, boot reports, owner removal, rollback and teardown.
• Both native loaders execute the exact same example entry chunk on Red, Gold, FireRed and Emerald. Native API 2, unified API 2 and API 3 pass at feature and combined integration heads: 48 isolated runs / 144 matching frame observations.
• The cross-engine test invokes the actual main.lua love.update callback, including Gen1's profiler wrapper. Test-only upvalue injection supplies a Game:update spy and non-game owners; neither native routing nor PlatformHooks is replaced. Unrelated host housekeeping is isolated behind a counter.
• Combined previous-PR integration: 137/137 engine suites, SDK 3/3, and B30 pass. The input, world/render and shader features remain integrated.
• Feature: 83/93 engine suites, versus dependency Add portable mod.input tap, press and release controls #143's 81/91. The exact same 10 failing suites and 17 failed assertions remain; no new failures. SDK 3/3 and B30 pass. The existing baseline-fix PRs are included in the green integration.
• Formatting, workflow lint and diff checks pass. The implementation cherry-picks onto the combined integration without conflicts.

ROM-dependent tiers were skipped without imported data. These tests verify dispatch and native routing with spies, not full-world simulation, GPU rendering or OS event delivery.

Hosted workflows currently require maintainer approval (action_required): API 3 contracts, portable input hook contract, ci, portable core.update contract, portable logical mod input contract. No hosted pass is claimed.