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docs/retroarch/phase-1.0af-offline-bigapp-lifecycle-model.md

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+# Phase 1.0AF: offline BigApp lifecycle model
+
+Status: `HOST_LIFECYCLE_MODEL_COMPLETE_TARGET_IMPLEMENTATION_BLOCKED`
+
+Date: 2026-07-29
+
+The host-only state machine implements the lifecycle selected in Phase 1.0AE
+using exact built-in fake events. It contains no PS5 headers, process calls,
+syscalls, socket, real clock, CLI or filesystem output.
+
+The model refuses launch when a BigApp already exists. A successful synthetic
+attempt must attach and arm the parent, request only fixed title `PPSA01659`,
+observe one positive unique child identity, detach the parent, observe child
+exec, replace one exact payload, restore temporary mutations, detach the child
+and emit one result within 64 supplied ticks.
+
+Failure injection proves the modeled unwind order. An acquired parent is
+detached. A newly observed child is the only process eligible for termination.
+If replacement began, restoration precedes termination. Cleanup failure is a
+hard error rather than a clean result. These are properties of the model, not
+firmware or runtime evidence.
+
+Target implementation remains blocked. The next permitted work is a host-only
+bounded ELF contract and validator so malformed or oversized payloads can be
+rejected before any future launcher boundary.