Baseline: Ludic compiler + toolchain, Phase 1 syntax fixes complete

Self-hosted compiler (selfhost/*.ludic), runtime, examples, editor tooling,
and docs. Phase 1 of the syntax-redesign cohesion pass has landed:
edge-system fix, signature-query, when-alias, and the documentation truth-pass.
Suite green (14/14), C-free bootstrap fixpoint holds.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tools/editors/vscode/syntaxes/ludic.markdown-injection.json

@@ -0,0 +1,27 @@
+{
+  "scopeName": "markdown.ludic.codeblock",
+  "comment": "Injects Ludic highlighting into ```ludic fences in Markdown. Any TextMate-based editor (VS Code, Sublime, JetBrains' TextMate bundles, Zed) picks this up; JetBrains' native Markdown support gets the same thing for free from the registered `Ludic` language ID, and ludic-lsp will also serve semantic tokens and diagnostics for the fence bodies in a .md file.",
+  "injectionSelector": "L:text.html.markdown",
+  "patterns": [{ "include": "#ludic-code-block" }],
+  "repository": {
+    "ludic-code-block": {
+      "begin": "(^|\\G)(\\s*)(`{3,}|~{3,})\\s*(?i:(ludic)((\\s+|:|,|\\{|\\?)[^`~]*)?)$",
+      "name": "markup.fenced_code.block.markdown",
+      "end": "(^|\\G)(\\2|\\s{0,3})(\\3)\\s*$",
+      "beginCaptures": {
+        "3": { "name": "punctuation.definition.markdown" },
+        "4": { "name": "fenced_code.block.language.markdown" },
+        "5": { "name": "fenced_code.block.language.attributes.markdown" }
+      },
+      "endCaptures": { "3": { "name": "punctuation.definition.markdown" } },
+      "patterns": [
+        {
+          "begin": "(^|\\G)(\\s*)(.*)",
+          "while": "(^|\\G)(?!\\s*([`~]{3,})\\s*$)",
+          "contentName": "meta.embedded.block.ludic",
+          "patterns": [{ "include": "source.ludic" }]
+        }
+      ]
+    }
+  }
+}