Initial commit: SCIP indexer for Clojure

Features:
- Generate SCIP index from clojure-lsp dump
- Namespace definitions and usages
- Var definitions and usages
- Namespace alias definitions and usage references
- External symbol documentation for hover

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

build.clj

@@ -0,0 +1,14 @@
+(ns build
+  (:require [clojure.tools.build.api :as b]))
+
+(def class-dir "classes")
+(def java-src "java-src")
+
+(defn compile-java [_]
+  (b/javac {:src-dirs [java-src]
+            :class-dir class-dir
+            :basis (b/create-basis {:project "deps.edn"})
+            :javac-opts ["--release" "11"]}))
+
+(defn clean [_]
+  (b/delete {:path class-dir}))