2026-08-31 - obscene-tool vaddrs: export vaddrs resolved to names

Added a subcommand that reads a module's exports through SELFish and resolves each NID to a name from the mined corpus, emitting the name vaddr table orbistoun-firmware reads. Generated orbistoun/crates/orbistoun-firmware/data/libkernel-vaddrs.txt from the 12.40 libkernel_sys.sprx

• 1,867 exports, 1,644 named; orbistoun-firmware's own libkernel_exports test passes. The join key was the surprise: the corpus records a NID as raw hex (0x1e82d558d6a70417) and an export table records the base64 encoding (HoLVWNanBBc) - two forms of one value, bridged by selfish_nid::Nid::decode. See D265. Unresolved NIDs keep their encoded form rather than being dropped or guessed. Verified via the tool's own clippy -D warnings and unit tests: the C make check host build is currently broken by a parallel session's src/sections/selfdump.c (missing obscene/imports.h), which is not this change.