Add full compiler toolchain, libc, examples and reference docs

First substantive commit: the entire Sprinter C compiler tree on top of
the bare README+gitignore initial commit.

What's in here:
  bin/sprinter-cc        — driver script invoking SDCC + linker + mkexe
  libc/                  — Sprinter-specific libc layer over ESTEX/BIOS
                           (conio, gfx, io, mem, stdio + headers)
  runtime/               — crt0 variants (default/small/banked/minimal)
                           + heap + bank trampolines
  toolchain/             — mkexe (SprintEXE packer, C + tests)
  examples/              — 30 demo programs (gfx, file I/O, env, time, …)
  lib/Makefile           — builds the libc archive (sprinter.lib)
  docs/                  — converted Sprinter manuals + asm reference samples
  third_party/           — solid-c reference compiler dump + sdcc setup script
  release_docs/          — packaging / release notes

gitignore overhaul:
  • Drop dangerous blanket patterns: *.asm (would hide docs/samples/*.asm)
    and *.exe (case-insensitive match was hiding third_party/solid-c/*.EXE
    on macOS APFS).  Replaced with examples/*/*.{asm,exe,…} and lib/*.lib.
  • Restore tracking of toolchain/mkexe/tests/{one,big}.bin — those are
    INPUT fixtures, not build outputs.
  • Collapse the duplicated SDCC/C/Sdcc sections into one section per
    concern (build outputs / vendored / OS-junk).
  • Add .sprinter-cc-*/, build/ (catches lib/build/ too), .claude/.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

docs/reference/SPRINT2K/SPRN2K53.TXT

@@ -0,0 +1,134 @@
+*** Area: ZX.SPECTRUM                             Date:  1 May 01 22:32:59
+*** From: Stas Vlasov (2:5080/172.0)
+*** To  : All
+*** Subj: New os for Sprinter
+
+           Hello All!
+
+H ¬¥âª¨ ¯à®¥ªâ  ¤«ï ­®¢®© ®¯¥à æ¨®­ª¨ ¤«ï Sprinter' , ­¥ â ª ¯®å®¦¥© ­  DOS.
+
+=== Cut ===
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+
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+
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+ID áâà ­¨æë ᮠᬥ饭¨ï 0000h |
+ID áâà ­¨æë ᮠᬥ饭¨ï 4000h | \ �® 16 ¡¨â ¢ ᮮ⢥âá⢨¨ á® áâàãªâãன
+ID áâà ­¨æë ᮠᬥ饭¨ï 8000h | / ¨­ä®à¬ æ¨¨ ® áâà ­¨æ¥ ¯ ¬ïâ¨.
+ID áâà ­¨æë ᮠᬥ饭¨ï C000h |
+=== Cut ===
+
+�ਬ¥ç ­¨ï, ¨á¯à ¢«¥­¨ï, ¤®¯®«­¥­¨ï ¯à¨¢¥âáâ¢ãîâáï.
+‚®§à ¦¥­¨ï (­¥ ¢ á⨫¥ "­ ä¨£ ­ã¦¥­ ‘¯à¨­â¥à") â ª¦¥ ¯à¨¢¥âáâ¢ãîâáï.
+
+Good luck.
+         Stas
+
+--- …é¥ ®¤­® "§®«®â®" 3.0.1
+ * Origin: gui is good, but console better (2:5080/172)