Install, CI, seeds and docs for the compiler written in Finch

bootstrap/install.sh and a share/finch lookup for the runtime and std; an ARM64 Linux seed; bootstrap/README.md;
CI builds from the seed on x64 and ARM64 and runs every test on Windows (Wine) and ARM64 (qemu); README, install and
layout sections of the guides (EN+PL) no longer talk about CMake; editors know enum, match and export.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015f73FesGZGYPkmDvUcj6QX

editors/kate/finch.xml

@@ -11,6 +11,8 @@
     <list name="keywords">
       <item>fn</item>
       <item>struct</item>
+      <item>enum</item>
+      <item>export</item>
     </list>
     <list name="control">
       <item>if</item>
@@ -24,6 +26,7 @@
       <item>defer</item>
       <item>or</item>
       <item>try</item>
+      <item>match</item>
     </list>
     <list name="imports">
       <item>import</item>