# Phase 1.0AK: offline hybrid primitive composition

Status: `HOST_HYBRID_RESOURCE_OWNERSHIP_MODEL_COMPLETE_TARGET_CODE_BLOCKED`

Date: 2026-07-29

This host-only model composes the lifecycle and mapping ownership needed by a
future BigApp route. It explicitly tracks the child, whole image region, host
mirror and every per-executable-segment JIT master descriptor, alias descriptor,
host alias and remote alias.

Every forward operation is failure-injected. Acquired temporary resources are
released in reverse groups. A failed release is never treated as successful
release: once a child exists, bounded kill-and-reap is the terminal owner and
models operating-system reclamation. Failure of that terminal operation is a
hard error. A successful outcome retains only the child and committed image;
all temporary resources are closed.

The model contains no process, mapping, target, clock, socket or device
interface. It does not prove that the source primitives compose on firmware
9.60. In particular, partial progress and credential restoration for the SDK
`mdbg_copyin` path still require a source-bound audit before target code can be
considered.