tech-debt: agentic-node cross-platform CI matrix unverified beyond macOS-arm64

[igorilic]

What's missing

`.github/workflows/agentic-node.yml` was scaffolded from the napi-rs `triples` declared in `crates/agentic-node/package.json` — five targets:

• x86_64-apple-darwin
• aarch64-apple-darwin
• x86_64-unknown-linux-gnu
• aarch64-unknown-linux-gnu
• x86_64-pc-windows-msvc

Only `aarch64-apple-darwin` was exercised locally (the dev box). The other four legs have never run.

Why deferred

There's no way to verify these from a single dev box. The first push to a branch / PR is the moment the matrix actually executes. Expect platform-specific tweaks:

• linux-gnu: probably needs `libssl-dev` / pkg-config bumps
• linux-arm64: cross-compile toolchain (`gcc-aarch64-linux-gnu`)
• windows-msvc: linker flag quirks, possibly /MD vs /MT

Trigger

The first PR that pushes this workflow OR an explicit `workflow_dispatch` on main. Whichever happens first.

Pointer

• .github/workflows/agentic-node.yml
• crates/agentic-node/package.json (triples list)