D272 - A GPU field for the driver, DISK wired through statfs; TEMP stays honestly unknown

Three HUD fields the console showed as unknown, and a question of whether each could honestly show a value.

GPU - a new field. GEN answers "which console generation", and on a ps4_game that is unanswerable: the current generation's AGC driver is refused the category, so obs_current_present() returns "could not look" and the verdict collapses to ps4_mode (D255, correctly - "could not look at gen5" must never be reported as gen4). But that discards a fact the same probe holds: the gnm graphics driver resolves here - it renders the report and 165-gnm passes. So a separate GPU field now reports the driver that resolves (gnm / agc / gnm+agc) via obs_gpu_drivers(), which asks the driver question rather than the generation one. gnm present names a driver, not a console - a current-generation console in compatibility mode exposes it too - so nothing here ages, and it needs no new provenance (the same two markers 005-generation already keys on).

DISK - wired through statfs. Free bytes = f_bavail × f_bsize, read at FreeBSD's stable offsets (f_bsize 0x10, f_bavail 0x30 - sys/mount.h) out of an over-sized buffer, so the struct layout past those two words is never depended on. That is the discipline the version getters already use, and the honest way to call a query whose full vendor struct this program deliberately does not carry (D008). statfs moved from the mined corpus into platform.h - a name cannot be both a const char census entry and a callable symbol - and the corpus regenerated to exclude it, dropping libkernel from 789 to 788. /download0 is a title's own writable mount; a path the sandbox refuses reports unconfirmed, not a wrong number.

TEMP - stays unknown, deliberately. No SoC-temperature query exists in the corpus at all - the "temp" matches are template/temporary - and inventing an arity or a struct for a thermal call is the sin this program exists to expose (D008). The field stays as the visible reminder that a provenanced temperature signature is wanted and not yet found. That is the honest state, not an oversight.

NET / KEY - left as they are. They are the serve-mode command-socket bind and the session secret, correctly absent on a packaged suite run that serves nothing; they light up in a serving build.

Status: done.