feat(lang): #76 namespace block form with export/internal visibility

`namespace Name { export function foo(...) ... internal function bar(...) ... }`
declares a Name.* namespace once and controls its public surface declaratively,
instead of annotating every function with @Namespace(Name). Inside the block
each `function short(...)` is emitted as `namelower_short`; export (the default)
makes it callable as Name.short(...), internal keeps it a private helper
(emitted, callable by short name from siblings — calls are rewritten — but
Name.internalOne() is a compile error). Block sugar for the per-function
@Namespace annotation; a package's public API reads at a glance. Namespaces
declared the old way are unchanged (gameplay_foundation still passes).

namespace added to LUDIC_KW_DECL + JetBrains/TextMate + docs page + inventory
(vocab/impl/docs checks green). Example namespace_block (export + internal +
sibling calls + internal-visibility compile error verified). Full suite 116/0,
fixpoint holds.

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

tools/editors/jetbrains/src/main/kotlin/io/ludic/ide/LudicTokens.kt

@@ -41,7 +41,7 @@ object LudicTokens {
  */
 object LudicVocabulary {
     val DECL = setOf(
-        "program", "import", "property", "model", "enum", "ui",
+        "program", "import", "property", "model", "enum", "ui", "namespace",
         "const", "var", "function", "extern", "handler", "entry", "event", "scene", "test"
     )
     val CLAUSE = setOf(

tools/editors/shared/ludic.tmLanguage.json

@@ -176,7 +176,7 @@
         { "name": "keyword.operator.logical.ludic", "match": "\\b(and|or|not)\\b" },
         { "name": "keyword.other.clause.ludic", "match": "\\b(phase|query|on)\\b" },
         { "name": "keyword.other.ludic", "match": "\\b(import|extern)\\b" },
-        { "name": "storage.type.ludic", "match": "\\b(program|property|model|enum|ui|const|var|let|function|handler|entry|state|test)\\b" },
+        { "name": "storage.type.ludic", "match": "\\b(program|property|model|namespace|enum|ui|const|var|let|function|handler|entry|state|test)\\b" },
         { "name": "support.type.primitive.ludic", "match": "\\b(int|long|fixed|bool|entity|string|pointer|byte|words|fixeds|pointers|Vector|IVec2|Rect|void)\\b" },
         { "name": "constant.language.boolean.ludic", "match": "\\b(true|false|null)\\b" },
         { "name": "constant.language.phase.ludic", "match": "\\b(Start|Input|FixedUpdate|Update|LateUpdate|Render)\\b" }

tools/editors/vscode/syntaxes/ludic.tmLanguage.json

@@ -176,7 +176,7 @@
         { "name": "keyword.operator.logical.ludic", "match": "\\b(and|or|not)\\b" },
         { "name": "keyword.other.clause.ludic", "match": "\\b(phase|query|on)\\b" },
         { "name": "keyword.other.ludic", "match": "\\b(import|extern)\\b" },
-        { "name": "storage.type.ludic", "match": "\\b(program|property|model|enum|ui|const|var|let|function|handler|entry|state|test)\\b" },
+        { "name": "storage.type.ludic", "match": "\\b(program|property|model|namespace|enum|ui|const|var|let|function|handler|entry|state|test)\\b" },
         { "name": "support.type.primitive.ludic", "match": "\\b(int|long|fixed|bool|entity|string|pointer|byte|words|fixeds|pointers|Vector|IVec2|Rect|void)\\b" },
         { "name": "constant.language.boolean.ludic", "match": "\\b(true|false|null)\\b" },
         { "name": "constant.language.phase.ludic", "match": "\\b(Start|Input|FixedUpdate|Update|LateUpdate|Render)\\b" }