[BuffJesus]

Bring the public modernization groundwork from #36 onto current main, retaining
its history and the CI repairs already on main. This includes the save, bank,
codec, compatibility, platform and texture modules, their tools/tests, and
modernization documentation. This supersedes #36; its occupied branch is preserved.

Fix issues found during integration and review:

• Python save text: emit correct empty/short strings and reject truncated framing,
  payloads and tails instead of returning incomplete text and invalid offsets.
• LZO/zlib decoding: enforce declared output bounds while decoding and avoid
  allocating output from the declared size alone. Empty zlib chunks now decode,
  and trailing bytes inside a compressed chunk are rejected.
• Bank decoding: reject impossible entry counts before reserving storage and
  handle a null input as truncated data.
• DXT decoding: include partial right/bottom blocks and reject truncated block
  data before allocating the output image.

Synthetic regressions reproduce the pre-fix failures and cover signed-length
boundaries, adjacent fields, empty chunks, output bounds, minimum bank entries
and DXT1/DXT3 edge blocks. Also remove one trailing documentation blank line.

Local validation: GCC 15.2 Release with LZO OFF and ON, and MSVC 19.44 x64 Release
with LZO OFF, each pass full builds and 10/10 CTest tests. Python source-only
selection passes 178 tests and 122 subtests (33 conditional installed-game tests
explicitly skipped; 10 exclusions from the existing vc71/retail name filter).
README consistency, documentation links/findings/root and whitespace checks pass.
All three hosted checks pass for review head 632c28b: Python/docs consistency,
Linux GCC/LZO ON, and Windows MSVC x64. A bounded independent review of the
eight-file C++ correction found no merge blocker. No game/corpus validation
is claimed. No private owner source, evidence or build outputs are included.