feat(cli): install in one command, and call the CLI ludic

Getting started meant cloning the repository, bootstrapping a compiler and
learning a task runner called `x`. That is a contributor's workflow handed to
everyone who wants to try the language.

Installing is now one command:

    curl -fsSL https://workshopsoft.pages.workshopsoft.io/ludic/install.sh | sh

install.sh puts a complete toolchain — compiler, CLI, engine runtime, bundled
ludic.* packages, formatter, language server — in ~/.ludic and adds it to PATH.
Prebuilt artifacts are checksum-verified; where a platform has none, or the
release predates this layout, it bootstraps from the compiler's own IR seed with
clang. The docs site publishes the script beside the pages that quote it, so the
page and the script can never come from different releases.

`x` becomes `ludic`, and the surface splits by audience. A user of the language
sees `new`, `run`, `build`, `test`, `add`, `fmt`, `lsp`, `doctor`, `upgrade`;
`ludic new` scaffolds a project that builds and plays as it stands. Everything
the toolchain repo needs moved under `ludic dev` — build, test, reseed,
bootstrap-cfree, docs-gen, release — unchanged apart from the namespace. Those
tasks read arguments one position further along, so dispatch_dev sets a shift
and commands use arg_n()/arg_total() rather than each knowing its own depth.

Release artifacts become complete install roots (bin/ beside runtime/, packages/
and VERSION) rather than bare binaries, which is what the installer unpacks.
`ludic dev test` asserts the whole shape: it stages an install, puts it on PATH
with no LUDIC_HOME, and runs new -> build -> test through it.

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

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

@@ -17,7 +17,7 @@ import java.io.File
 
 /**
  * Where to find the toolchain. Both paths may be left blank, in which case the
- * plugin looks under the project root for what `bin/x tools` produces —
+ * plugin looks under the project root for what `bin/ludic dev tools` produces —
  * which is the case for anyone working in the Ludic repository itself.
  */
 @Service(Service.Level.PROJECT)
@@ -60,13 +60,23 @@ internal fun findExecutable(root: String?, configured: String, names: List<Strin
 
 /** Fall back to PATH, so a system-wide install works with no configuration. */
 private fun searchPath(names: List<String>): String? {
-    val path = System.getenv("PATH") ?: return null
-    for (dir in path.split(File.pathSeparator)) {
-        for (name in names) {
-            val f = File(dir, name)
-            if (f.isFile && f.canExecute()) return f.absolutePath
+    val path = System.getenv("PATH")
+    if (path != null) {
+        for (dir in path.split(File.pathSeparator)) {
+            for (name in names) {
+                val f = File(dir, name)
+                if (f.isFile && f.canExecute()) return f.absolutePath
+            }
         }
     }
+    // The install root, last: an IDE launched from the desktop does not inherit
+    // the PATH the installer wrote to the shell profile, so a working ~/.ludic
+    // install would otherwise look missing.
+    val home = System.getenv("LUDIC_HOME") ?: (System.getProperty("user.home") + "/.ludic")
+    for (name in names) {
+        val f = File(File(home, "bin"), name)
+        if (f.isFile && f.canExecute()) return f.absolutePath
+    }
     return null
 }
 
@@ -108,9 +118,10 @@ class LudicConnectionProvider(private val project: Project) : ProcessStreamConne
                 append(if (root != null) File(File(root, d), "ludic-lsp").path else "<no project root>/$d/ludic-lsp")
                 append('\n')
             }
-            append("  and on PATH.\n")
+            append("  on PATH, and in ~/.ludic/bin.\n")
         }
-        append("\nBuild it with `bin/x tools` from the repository root, ")
+        append("\nInstall the toolchain (curl -fsSL https://workshopsoft.pages.workshopsoft.io/ludic/install.sh | sh), ")
+        append("build it with `bin/ludic dev tools` from a checkout, ")
         append("or set the path in Settings | Languages & Frameworks | Ludic. ")
         append("Syntax highlighting works without it; completion and diagnostics do not.")
     }

tools/editors/jetbrains/src/main/resources/META-INF/plugin.xml

@@ -67,7 +67,7 @@
             name="Ludic"
             factoryClass="io.ludic.ide.LudicLanguageServerFactory">
             <description><![CDATA[
-            The Ludic language server. Built by <code>bin/x tools</code>.
+            The Ludic language server. Built by <code>bin/ludic dev tools</code>.
             ]]></description>
         </server>
         <languageMapping language="Ludic" serverId="ludic"/>