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/SPRN2K22.TXT

@@ -0,0 +1,110 @@
+*** Area: ZX.SPECTRUM                             Date:  9 Apr 01 22:35:00
+*** From: Alex Goryachev (2:5030/529.56)
+*** To  : Sergey Krinitsin
+*** Subj: Sprinter News
+
+    �ਢ¥âáâ¢ãî, Sergey!
+
+   Saturday April 07 2001 Sergey Krinitsin -> Alex Goryachev.
+
+ AG>> ‚®â ­  íâ®â á«ãç © ¨ ¯p¥¤ãᬮâp¥­ ¢ p¨ ­â ¨á¯®«ì§®¢ ­¨ï
+ AG>> ⥫¥¢¨§®p .
+
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+ SK> Žá®¡¥­­® ­  ¢ë᮪¨å à §à¥è¥­¨ïå? Œ®¦¥â ¤ ¦¥ ¯®­à ¢¨«®áì?
+
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+¬®­¨â®p ¬¨ ¯® ª ç¥áâ¢ã ¨§®¡p ¦¥­¨ï. € Sprinter á ⥫¥¢¨§®p®¬, ¢®â 㦥
+¤«¨â¥«ì­®¥ ¢p¥¬ï, ¨á¯®«ì§ã¥â Ivan Mak.
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+á«ãç ¥ ¨§®¡p ¦¥­¨¥ ¡ã¤¥â ç¥âª¨¬.
+
+ >>> ‘®§¤ ¥âáï ¢¯¥ç â«¥­¨¥, çâ® ¢ è  ä¨à¬  § âà â¨¢ ®¯à¥¤¥«¥­­ë¥
+ >>> á।á⢠ (¨¬å® ᮢᥬ ­¥ ¡®«ì訥), ¯ëâ ¥âáï «î묨 ᯮᮡ ¬¨
+ >>> á¡ £à¨âì ª®¬¯
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+ >>> 堫®£® á®äâ , çâ®¡ë ¥é¥ ¡®«¥¥ 㢥«¨ç¨âì ¯à®¤ ¦¨. H® ¬ è¨­ 
+ AG>> H¥ ¡ã¤ã ®¡p é âì ¢­¨¬ ­¨¥ ­  ¨§¢p é¥­­®¥ ¯p¥¤áâ ¢«¥­¨¥
+ AG>> ª®¬¬¥pç¥áª¨å 楫¥© ­ è¥© ä¨p¬ë.
+
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+ SK> ¯à¨¡ë«¨.
+
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+
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+ AG>> ª®­ä¥p¥­æ¨¨, â® ¯®ïá­î, çâ® ®­  á®á⮨⠭¥ ¢ ¯®¨áª¥
+ AG>> ¯®ªã¯ â¥«¥©,   ¢ ¦¥« ­¨¨ ¯®§­ ª®¬¨âì ¨­â¥p¥áãîé¨åáï á®
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+ SK> [...]
+
+ >>> ˆ ¨¬¥âì ᮢ¬¥á⨬®áâì ⮫쪮 ­  ã஢­¥ ª®¬¬ ­¤ ¯à®æ¥áá®à ? :)
+ AG>> � §¢¥ ï £®¢®p¨«, çâ® ®­¨ ¤®«¦­ë ¨¬¥âì ᮢ¬¥á⨬®áâì? Š ª ï
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+ AG>> ãáâp®©á⢠.
+
+ SK> ’®£¤  ª ª®¥ ®â­®è¥­¨¥ ®­¨ ¨¬¥îâ ª Sprinter'ã ?
+
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+
+
+ AG>> ‚ ï­¢ p¥ í⮣® £®¤  ¯p®¨§®è«¨ ¨§¬¥­¥­¨ï, ­ ¯p ¢«¥­­ë¥ ­ 
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+
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+
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+¯®¦¥« ­¨ï.
+
+
+    “¤ ç¨!
+
+    Alex Goryachev.
+
+    [ZX]...[Sprinter]...
+
+---
+ * Origin: PETERS PLUS LTD (2:5030/529.56)