feat(lang): float and double types with ordinary operators

`float` (32-bit) and `double` (64-bit) with + - * / %, comparisons and unary minus.
Decimal literals take their type from context and stay `fixed` elsewhere; int and long
promote implicitly (LUDIC_WARN_FLOAT_PROMOTE=1 lists every promotion). float(), double(),
int(), long() and fixed() convert; floats(n)/doubles(n) buffers; float fields, globals,
constants and parameters; Math.* computes in float for float arguments; string/print
write the shortest round-tripping decimal; float_bits/float_from_bits expose the bits.
@deterministic code may not use floats. The f_* runtime helpers stay as they are.

Editors know the new type words; the JetBrains plugin is 1.5.0.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

tools/editors/jetbrains/README.md

@@ -17,7 +17,7 @@ packages cleanly can still fail to load:
   scheduled-for-removal API usages.
 - `./gradlew runIde` boots a real IDEA 2025.3 with the plugin installed. The
   sandbox log line to look for is
-  `Loaded custom plugins: LSP4IJ (0.20.1), Ludic (1.4.0)` in
+  `Loaded custom plugins: LSP4IJ (0.20.1), Ludic (1.5.0)` in
   `.intellijPlatform/sandbox/Ludic/IC-2025.3/log/idea.log`.
 
 **If the plugin does not appear in Settings -> Plugins after installing**, the
@@ -35,7 +35,7 @@ as the error message, which is not obvious the first time you see it:
 ```bash
 export JAVA_HOME=$(/usr/libexec/java_home -v 21)     # macOS
 cd tools/editors/jetbrains
-./gradlew buildPlugin        # -> build/distributions/Ludic-1.4.0.zip
+./gradlew buildPlugin        # -> build/distributions/Ludic-1.5.0.zip
 ./gradlew runIde             # try it in a sandbox IDE
 ```
 

tools/editors/jetbrains/gradle.properties

@@ -1,6 +1,6 @@
 pluginGroup = io.ludic.ide
 pluginName = Ludic
-pluginVersion = 1.4.0
+pluginVersion = 1.5.0
 
 # 2024.2 (242) is the oldest platform LSP4IJ 0.20+ installs on, so it is the
 # floor here too: claiming older would let an IDE accept this plugin and then

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

@@ -71,7 +71,7 @@ object LudicVocabulary {
         "enable", "disable", "match", "machine", "prefab", "state", "become", "where",
         "and", "or", "not", "break", "continue", "new", "emit", "cancel", "try"
     )
-    val PRIMITIVES = setOf("int", "long", "fixed", "countdown", "bool", "entity", "string", "pointer", "byte", "words", "fixeds", "pointers", "Vector", "IVec2", "Rect", "void")
+    val PRIMITIVES = setOf("int", "long", "fixed", "float", "double", "countdown", "bool", "entity", "string", "pointer", "byte", "words", "fixeds", "floats", "doubles", "pointers", "Vector", "IVec2", "Rect", "void")
     val PHASES = setOf("Start", "Input", "FixedUpdate", "Update", "LateUpdate", "Render", "Overlay")
     val WIDGETS = setOf("panel", "col", "row", "label", "button", "image", "spacer")