D276 - payload mode is the ps4 backward-compatibility context

Status: assumed (measured, composite).

An elfldr payload - make payload, the shape that runs the whole suite on hardware today - executes in the PS4 backward-compatibility environment, not natively. This is the environment OBS|context (D275) names payload/ps4-bc. Recorded here because it is the frame every current hardware report has to be read in, and because it is the thing that decides which findings are "absent on this platform" versus "absent because this is the compatibility sandbox."

The evidence is composite and consistent:

• Delivery. The package is a previous-generation .pkg; it installs through the compatibility path and is badged as the older hardware (D267 and scripts/build-pkg.sh). A title installed that way is a PS4 title to the console.
• The GPU library. 005-generation finds the previous generation's driver (libSceGnm) resolves and the current generation's (libSceAgc) does not - and the loader refuses a ps4-category title the current-generation libraries with an EI_ABIVERSION mismatch it prints to the system log (see src/sections/generation.c). The two are the same fact: ps4 category, ps4 graphics stack, no RDNA2/libSceAgc.
• Imports. elfldr resolves none; only the base+vaddr-reachable checks survive (136-kernel, 139-exports), everything behind an import skips. (WORKLOG, same day.)
• Introspection is denied three independent ways, which is what a locked BC sandbox looks like: sceKernelGetModuleInfo refused (0x80020016 for every buffer size, 0x160 included), sceKernelDlsym refused (0x80020003), and the runtime-linker debug link-map absent (DT_DEBUG not populated - elfldr maps the payload without rtld registration, D275).

What this does not mean: it is not the signing wall and not a packaging defect - the package installs and launches. It is the delivery. Native (ps5-native) execution - out of the BC sandbox, libSceAgc reachable - requires running obSCEne inside a native-category process, for which prosperous/elfldr expose no route today (see prosperous's own analysis); the standing plan is a Ghostpad-class injector into a launch-ed native title. Until then, read every payload report as ps4-bc, and let OBS|context say so on the line.