milestone: desktop path Phases 1-5

Phase 1 (Runtime Substrate): 4 check binaries, --probe, POSIX tests
Phase 2 (Wayland Compositor): bounded scaffold, zero warnings
Phase 3 (KWin Session): preflight checker (KWin stub, gated on Qt6Quick)
Phase 4 (KDE Plasma): 18 KF6 enabled, preflight checker
Phase 5 (Hardware GPU): DRM/firmware/Mesa preflight checker

Build: zero warnings, all scripts syntax-clean. Oracle-verified.

recipes/core/base/init/Cargo.toml

@@ -0,0 +1,20 @@
+[package]
+name = "init"
+description = "Userspace process launcher"
+version = "0.1.0"
+edition = "2024"
+license = "MIT"
+
+[dependencies]
+libc.workspace = true
+libredox.workspace = true
+plain.workspace = true
+redox_syscall.workspace = true
+serde.workspace = true
+serde_json.workspace = true
+toml.workspace = true
+
+config = { path = "../config" }
+
+[lints]
+workspace = true