textmate-bjolang: code highlighted as VS Code does, as Bjolang values

TextMateSharp runs VS Code's TextMate grammars and themes; this hands
the result over once, as Bjolang values, so nothing using it needs to
know TextMateSharp is there. `tokenize` gives each line's tokens and
their scopes, `highlight` each line's spans in the theme's colours, and
`highlight->node` and `code->node` give (text xml) nodes: a pre and a
code element around spans, coloured inline by the theme or by class
names taken from the scopes. `highlighter-css` writes the stylesheet
for the classes from a theme, choosing each class's rule the way
TextMateSharp's tokenizer chooses a token's.

Bjolang's own grammar is in grammars/bjolang, laid out as a VS Code
extension, and every highlighter reads it from beside the package's
src/. It follows what Bjolang's reader reads, including interpolated
strings with expressions in their holes.

There is no C# shim: everything goes through import/class and
import/extern. The package is kept within TextMateSharp 2.0, because
token colours are decoded with a class in its Internal namespace.

🤖 Generated with [ECA](https://eca.dev) (anthropic/claude-opus-4-7)

Co-Authored-By: eca-agent <git@eca.dev>

grammars/bjolang/package.json

@@ -0,0 +1,28 @@
+{
+  "name": "bjolang",
+  "displayName": "Bjolang",
+  "description": "Syntax highlighting for Bjolang.",
+  "version": "0.1.0",
+  "publisher": "bjoli",
+  "license": "MPL-2.0",
+  "engines": {
+    "vscode": "^1.60.0"
+  },
+  "contributes": {
+    "languages": [
+      {
+        "id": "bjolang",
+        "aliases": ["Bjolang", "bjolang", "bjo"],
+        "extensions": [".bjo", ".protobjo"],
+        "configuration": "./language-configuration.json"
+      }
+    ],
+    "grammars": [
+      {
+        "language": "bjolang",
+        "scopeName": "source.bjolang",
+        "path": "./syntaxes/bjolang.tmLanguage.json"
+      }
+    ]
+  }
+}