feat(tooling): JetBrains IDE support, LSP navigation, barrel imports, package scripts and hooks

- JetBrains plugin 1.4.0: semantic colours (builtin / vendor / own), template strings,
  brace handling, run configurations and a test console, package.ludic and
  package.lock.ludic editing (completion, docs, app preview, colour previews, asset
  navigation), External Libraries for the runtime and packages, doc pages for built-ins
- ludic-lsp: go to definition for imports, document links, hover with inferred types,
  type definition, signature help with parameters, docs from docs/language
- `import "dir"` resolves a barrel `dir/index.ludic`
- package.ludic `entry`, `script` and `hook before|after <command>`; `ludic <script>`,
  `ludic script`, `ludic scripts`
- `ludic test --verbose` and `--test NAME`; the test runner filters by name

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

tools/editors/jetbrains/build.gradle.kts

@@ -1,3 +1,4 @@
+import java.time.Duration
 import org.jetbrains.intellij.platform.gradle.TestFrameworkType
 import org.jetbrains.intellij.platform.gradle.IntelliJPlatformType
 
@@ -9,6 +10,8 @@ plugins {
     id("org.jetbrains.intellij.platform") version "2.18.1"
 }
 
+val localIde = providers.gradleProperty("localIde")
+
 group = providers.gradleProperty("pluginGroup").get()
 version = providers.gradleProperty("pluginVersion").get()
 
@@ -65,6 +68,9 @@ intellijPlatform {
             create(IntelliJPlatformType.IntellijIdeaCommunity, providers.gradleProperty("platformVersion").get()) {
                 useInstaller = false
             }
+            // -PlocalIde=/path/to/IDE.app also checks against an installed IDE,
+            // e.g. the newer one a developer actually uses
+            localIde.orNull?.let { local(it) }
         }
     }
 
@@ -87,8 +93,32 @@ tasks.named<JavaExec>("runIde") {
     args = listOf(repoRoot.absolutePath)
 }
 
+// `./gradlew runLocalIde -PlocalIde=/Applications/IntelliJ IDEA.app [-PopenProject=dir]`:
+// the same sandbox as runIde, booted from an installed IDE instead of the
+// downloaded one, so the plugin can be tried on exactly that build.
+val runLocalIde by intellijPlatformTesting.runIde.registering {
+    localPath = localIde.map { file(it) }
+    task {
+        args = listOf(providers.gradleProperty("openProject").getOrElse(repoRoot.absolutePath))
+    }
+    plugins {
+        plugin("com.redhat.devtools.lsp4ij", providers.gradleProperty("lsp4ijVersion").get())
+    }
+}
+
+
+// The palette Color.* resolves against, straight from the docs it is generated
+// into (`ludic-dev docs-palette`), so the swatches cannot drift from the compiler.
+tasks.named<ProcessResources>("processResources") {
+    from(File(repoRoot, "docs/language/colors/palette.json"))
+}
+
 tasks.test {
     useJUnit()
+    // a platform test that waits on a modal dialog or an event that never
+    // comes blocks forever; fail the run instead of hanging it
+    timeout.set(Duration.ofMinutes(10))
+    systemProperty("idea.test.timeout", "120")
     testLogging {
         events("passed", "failed", "skipped")
         showStandardStreams = false