* feat(ghidra): admit 32-bit big-endian PowerPC ELF
Recognize EM_PPC as a provider-neutral `powerpc` family that keeps its ELF
class, byte order, type and flags, and admit ELF32 big-endian ET_EXEC through
a bounded Ghidra lane. ELF64, little-endian, relocatable/shared objects and
EF_PPC_EMB are refused with a specific reason; Hopper and IDA do not gain
PowerPC support, and Windows Ghidra P0 is unchanged.
Ghidra's ELF loader selects PowerPC:BE:32:e500:default for a plain EM_PPC
header, which misreads 750-family code. The lane binds
PowerPC:BE:32:default/default in the profile (language_selection
"admitted-lane-v1"), imports with it and checks the reported language. A
language set through REA_GHIDRA_LANGUAGE_ID still replaces the lane default.
Add a source-owned fixture, fixed-encoding probe, GNU readelf cross-check and
the optional `verify:ghidra:ppc` real-provider lane, plus docs/ghidra-ppc.md.
Refs #1741
* style(ghidra): format shared PowerPC profile integration
* fix(ghidra): preserve caller-selected PowerPC languages
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Co-authored-by: morluto <76467478+morluto@users.noreply.github.com>
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