v1.5.1 — console-install extraction, ISO fix, macOS tag fix

Source + bundle release, cut mid-test-week so the new extraction route can be tested. Bundles for all three platforms were restaged from this tag the same day (Windows exe and Deck binary rebuilt — version stamps 1.5.1, SDK stamps verified v0.9.3.1 across shipped components; macOS app rebundled). The Windows and Deck F&F bundles now include the extraction tooling.

• The extractor now reads console disc installs directly — no god2iso, no Velocity. Copy the game's Content\...\435A07D7 folder off your console and drag it onto extract_assets.bat: the copy is verified against the container's own SHA-1 hash tree before extraction (a corrupt copy is refused with the exact file named), and any marketplace DLC packages found beside the install are validated and installed into dlc/. Validated against a real console install: all 9 executables match the DUMPING.md checksums; the tree is byte-identical to a disc rip's.
• ISO extraction produced garbage for every file; fixed. Reads were based at the volume descriptor's offset, but XDVDFS sectors are partition-relative — 32 sectors late for every file, since the first release. Working dumps historically came from the extract-xiso tooling this repo once vendored.
• macOS builds from the tag work again. The vendored SDK's VERSION file collided with C++'s #include <version> on case-insensitive APFS; renamed REXGLUE_VERSION. This is the first tag that builds clean on macOS as checked out.

See CHANGELOG.md for details.