D067 - Supporting the current generation is three-quarters done and blocked on one oracle

The goal is for this crate to build for both console generations, with the current one added alongside the previous rather than replacing it. An audit of where the Generation split already reaches, prompted by getting an obSCEne package to install and launch on hardware, found selfish is closer than it looks - and found exactly one thing it cannot do without a file nobody here holds.

Already generation-aware:

• selfish-abi::Generation models both: container magic (54 14 F5 EE current, 4F 15 3D 1D previous), abi version (2 vs 0), number (5 vs 4).
• selfish-container builds and parses either from the magic. obSCEne's eboot.bin already carries 54 14 F5 EE - a current-generation executable, where the whole PS4-homebrew scene ships previous-generation ones. The hardest piece is the one already done.
• selfish-title reads and writes param.json, which the current generation uses in place of PARAM.SFO. A real one (PPSA02664) parses.

The gap: the current-generation package format, magic FIH (7F 46 49 48). selfish-pkg recognises it only to refuse it (UnsupportedFormat, D021) and builds the previous-generation .CNT format exclusively. Building FIH is what "current-generation package support" mostly means, and it cannot start yet: principle 1 forbids deriving a format from a binary, and principle 2 needs a real file as the oracle to confirm a structure taken from a citable source. No FIH package is reachable - the console's /data/pkg and /mnt/usb0 hold only .CNT homebrew packages. A native title is installed, not distributed as a loose package, so its FIH wrapper is not retained. Getting a real FIH package is the prerequisite for this workstream.

What a native title actually is, measured from an installed one (PPSA02664, the oracle we do have): not a mounted package at all. The app directory holds a mount.lnk - literal text /mnt/usb0/PPSA02664-app0/$ - pointing at a decrypted app0 filesystem elsewhere, plus param.json and a sce_sys richer than the previous generation's (disc_info.dat, keystone, nptitle.dat, pfs-version.dat). So there may be a second path to a current-generation homebrew title that skips FIH entirely: produce the installed form directly. That is groundable now against this oracle, where FIH is not.

Why the hybrid we have does not run, which is what motivated all this: obSCEne is a current-generation eboot.bin inside a previous-generation .CNT package with a previous-style title id (OBSC…). That routes the launch through the PS4-compatibility path (scePs4AppCategoryGetForTitleId), which refuses to exec a current-generation executable - preLaunchCheck 0x80a40086, cleanly, after the pfs mount this session fixed succeeds. A coherent title is both halves of one generation: previous+previous runs via compat with the previous library surface, current+current would route to the native loader with the current surface. selfish-pkg should carry the target generation and refuse a package whose executable disagrees with it (principle 4) - the check that would have named this mismatch at build time. That, and the installed-form path above, are the two additions that do not need the FIH oracle.