Replace exposed layer graph assembly with opaque declarations, checked substitutions, and lifetime-aware compilation. Preserve deep replacement, ordered startup, and Effect-owned resource lifetimes; migrate callers and verify source and published package contracts.
Move standalone skill activation into ID-bound Session handles and delegate from the public service. Preserve current-placement lookup, raw skill content, ambient publication context, validation order, and host-scoped detached resume behavior. Cover ownership and lifecycle contracts with focused regressions.
Separate ID-bound Session policy from host routing. Bind Inbox and Location preparation dependencies at construction, preserve admission and execution semantics, and cover the extracted ownership contracts directly.
