Track Koffi 3 split-package migration after #763

[rullerzhou-afk]

Context

#763 deliberately stays on the reviewed Koffi 2.x line and solves release size/cross-architecture payloads with a guarded afterPack prune plus full native inventory auditing. Koffi 3 migration is a separate ABI/provisioning change and must not be folded into that packaging fix.

Research and implementation scope

• Select an exact Koffi 3 version after the current ABI-fix cadence settles.
• Adapt pointer handling to BigInt and verify koffi.address() behavior.
• Prove all five @koromix/koffi-* target rows survive clean cross-platform lockfile installs, including version, resolved, integrity, os, and cpu metadata.
• Evaluate Koffi 3's process.resourcesPath search roots and a target-native extraResources provisioning model without splitting updater metadata ownership accidentally.
• Use full Electron, not only ELECTRON_RUN_AS_NODE, when the packaged process.resourcesPath load path or ASAR integrity path is involved.
• Run positive ABI probes for Windows x64/ARM64 COM vtable decode/call, Buffer/offset decode, structs, and koffi.address().
• Run positive macOS x64/ARM64 probes for multiple declarations of objc_msgSend, SkyLight calls, Space-stationary behavior, and de-delegation/restoration.
• Define updater metadata generation/merge ownership before changing any release job from its current multi-architecture invocation.

Entry criteria

• audit/package: investigate Koffi multi-target payload and elevate.exe exception #763's five-target native inventory contract is merged and stable.
• The selected Koffi 3 release has complete target packages for all five release targets.
• Native Windows ARM64 and Intel/Apple Silicon macOS execution capacity is available for positive behavior evidence.

Non-goals

• Do not weaken audit/package: investigate Koffi multi-target payload and elevate.exe exception #763's one-target-native-payload audit to make migration easier.
• Do not ship a hybrid containing both Koffi 2's multi-target package and Koffi 3 split target packages.