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/jetbrains/gradle.properties

@@ -0,0 +1,26 @@
+pluginGroup = io.ludic.ide
+pluginName = Ludic
+pluginVersion = 1.0.0
+
+# 2023.2 is the first build with the platform APIs this plugin uses. LSP4IJ (not
+# the paid-IDE LSP API) supplies the language-server bridge, so Community
+# editions are supported as well as Ultimate.
+pluginSinceBuild = 232
+# Deliberately ahead of the newest released platform (2025.3 is build 253): an
+# until-build that stops at today's IDE gets the plugin auto-disabled the moment
+# a user upgrades. 262 buys roughly three release cycles of headroom. The APIs
+# this plugin uses are the stable ones (LexerBase, SyntaxHighlighter,
+# ParserDefinition, FoldingBuilder), and everything project-wide is delegated to
+# ludic-lsp over a versioned protocol rather than to platform internals.
+pluginUntilBuild = 262.*
+
+platformVersion = 2025.3
+lsp4ijVersion = 0.20.1
+
+# Gradle itself must run on JDK 17-21; a newer JDK reports only its version
+# number as the failure. The Kotlin toolchain below is pinned separately.
+# The wrapper is Gradle 9.x because IntelliJ Platform Gradle Plugin 2.13+
+# requires it.
+org.gradle.jvmargs = -Xmx2g
+org.gradle.caching = true
+kotlin.stdlib.default.dependency = false