docs (en, pl) and editors: masks, tails, shuffles, lookup, dot_add, @cpu, cpu_has, Nix

- technicians' guides: section 31 rewritten around kernels (masks, the end of a list, moving lanes,
  int8 dot products, choosing instructions at build and at run time)
- cheat sheets and engineers' guides: the new operations and their IR; how features are found
- Kate and VS Code: @cpu, boolxN and the new built-ins highlighted

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Psc42moPLwP43Cmb9oZqSR

editors/vscode/CHANGELOG.md

@@ -2,7 +2,8 @@
 
 ## 2.6.0
 
-- Vector types (`f32x8`, `i8x32`, `f64x4`, …) highlighted as types; completion of their methods (`sum`, `dot`, `fma`, `store`, …).
+- Vector types (`f32x8`, `i8x32`, `f64x4`, …) and masks (`boolx8`) highlighted as types; completion of their methods (`sum`, `dot_add`, `shuffle`, `lookup`, `store`, …).
+- `@cpu(...)` and the new built-ins (`select`, `concat`, `fma`, `muladd`, `cpu_has`, `f32_bits`, `f16_to_f32`, …) highlighted.
 
 ## 2.5.0
 

editors/vscode/syntaxes/finch.tmLanguage.json

@@ -147,11 +147,15 @@
           "match": "\\bself\\b"
         },
         {
-          "name": "storage.type.primitive.finch",
-          "match": "\\b(int|float|bool|char|str|ptr|map|i8|i16|i32|i64|u8|u16|u32|u64|f32|f64|[iuf](?:8|16|32|64)x(?:2|4|8|16|32|64))\\b"
+          "name": "storage.modifier.attribute.finch",
+          "match": "@cpu\\b"
         },
         {
-          "match": "\\b(print|input|read_file|write_file|file_exists|delete_file|shell|exit|addr|new|free|error|min|max|abs|clamp|assert|atomic_add|atomic_sub|atomic_load|atomic_store|atomic_swap|atomic_cas)\\s*(?=\\()",
+          "name": "storage.type.primitive.finch",
+          "match": "\\b(int|float|bool|char|str|ptr|map|i8|i16|i32|i64|u8|u16|u32|u64|f32|f64|(?:[iuf](?:8|16|32|64)|bool)x(?:2|4|8|16|32|64))\\b"
+        },
+        {
+          "match": "\\b(print|input|read_file|write_file|file_exists|delete_file|shell|exit|addr|new|free|error|min|max|abs|clamp|assert|atomic_add|atomic_sub|atomic_load|atomic_store|atomic_swap|atomic_cas|select|concat|fma|muladd|cpu_has|f32_bits|f32_from_bits|f64_bits|f64_from_bits|f16_to_f32|f32_to_f16|bf16_to_f32|f32_to_bf16)\\s*(?=\\()",
           "captures": {
             "1": {
               "name": "support.function.builtin.finch"

editors/vscode/test/grammar.js

@@ -30,6 +30,7 @@ const code = [
   '    assert(clamp(x, 0, 9) == 3)',
   '}',
   'fn dot(f32x8 a, i8x32 b) {',
+  '@cpu("avx2") fn k(boolx8 m) { select(m, a, b) }',
 ];
 const expect = [  // [line, token text, scope that must be present]
   [0, 'import', 'keyword.control.import'], [0, '"stdio.h"', 'string.quoted.double'],
@@ -51,6 +52,7 @@ const expect = [  // [line, token text, scope that must be present]
   [17, 'f', 'meta.embedded.line'], [17, 'left', 'string.quoted.double'],
   [18, 'assert', 'support.function.builtin'], [18, 'clamp', 'support.function.builtin'],
   [20, 'f32x8', 'storage.type.primitive'], [20, 'i8x32', 'storage.type.primitive'],
+  [21, '@cpu', 'storage.modifier.attribute'], [21, 'boolx8', 'storage.type.primitive'], [21, 'select', 'support.function.builtin'],
 ];
 registry.loadGrammar('source.finch').then((g) => {
   let state = vsctm.INITIAL, toks = [];