fix: pass project root to ServiceDetector so filesystem walk runs during enrich

EnrichCommand called the 3-arg overload of ServiceDetector.detect(), which
set projectRoot=null and skipped the filesystem walk entirely.  Multi-module
projects (e.g. .NET eShop with 20+ .csproj files) only received the single
root-fallback SERVICE node because their build files were never parsed into
CodeNodes by any detector.

Passing `root` as the 4th argument enables the filesystem scan, so all
modules are discovered regardless of whether a detector created a node for
their build file.

Added ServiceDetectorTest#filesystemWalkFindsModulesNotPresentAsNodes to
verify this path with a simulated .NET monorepo (3 .csproj files, no
matching CodeNodes).

Co-Authored-By: Paperclip <noreply@paperclip.ing>

Author: aksOps

src/main/java/io/github/randomcodespace/iq/cli/EnrichCommand.java

@@ -145,7 +145,7 @@ private int enrichFromCache(AnalysisCache cache, Path root, NumberFormat nf, Ins
         CliOutput.step("\uD83C\uDFD7\uFE0F", "Detecting service boundaries...");
         var serviceDetector = new io.github.randomcodespace.iq.analyzer.ServiceDetector();
         String projectName = root.getFileName().toString();
-        var serviceResult = serviceDetector.detect(enrichedNodes, enrichedEdges, projectName);
+        var serviceResult = serviceDetector.detect(enrichedNodes, enrichedEdges, projectName, root);
         if (!serviceResult.serviceNodes().isEmpty()) {
             // Add service nodes and edges to the builder
             builder.addNodes(serviceResult.serviceNodes());

src/test/java/io/github/randomcodespace/iq/analyzer/ServiceDetectorTest.java

@@ -523,6 +523,38 @@ void deterministicWithContentExtraction(@TempDir Path tempDir) throws IOExceptio
         }
     }
 
+    @Test
+    void filesystemWalkFindsModulesNotPresentAsNodes(@TempDir Path tempDir) throws IOException {
+        // Simulate a .NET monorepo: .csproj files exist on disk but NO detector created CodeNodes for them
+        Files.createDirectories(tempDir.resolve("src/Basket.API"));
+        Files.writeString(tempDir.resolve("src/Basket.API/Basket.API.csproj"),
+                "<Project Sdk=\"Microsoft.NET.Sdk.Web\" />", StandardCharsets.UTF_8);
+
+        Files.createDirectories(tempDir.resolve("src/Catalog.API"));
+        Files.writeString(tempDir.resolve("src/Catalog.API/Catalog.API.csproj"),
+                "<Project Sdk=\"Microsoft.NET.Sdk.Web\" />", StandardCharsets.UTF_8);
+
+        Files.createDirectories(tempDir.resolve("src/Ordering.API"));
+        Files.writeString(tempDir.resolve("src/Ordering.API/Ordering.API.csproj"),
+                "<Project Sdk=\"Microsoft.NET.Sdk.Web\" />", StandardCharsets.UTF_8);
+
+        // No nodes have build file paths — they are only on the filesystem
+        List<CodeNode> nodes = new ArrayList<>();
+        nodes.add(makeNode("cls:BasketCtrl", NodeKind.CLASS, "BasketController",
+                "src/Basket.API/Controllers/BasketController.cs"));
+        nodes.add(makeNode("cls:CatalogCtrl", NodeKind.CLASS, "CatalogController",
+                "src/Catalog.API/Controllers/CatalogController.cs"));
+
+        var result = detector.detect(nodes, List.of(), "eShop", tempDir);
+
+        // Should detect 3 services via filesystem walk (not from node paths)
+        assertEquals(3, result.serviceNodes().size());
+        var names = result.serviceNodes().stream().map(CodeNode::getLabel).sorted().toList();
+        assertEquals(List.of("Basket.API", "Catalog.API", "Ordering.API"), names);
+        result.serviceNodes().forEach(svc ->
+                assertEquals("dotnet", svc.getProperties().get("build_tool")));
+    }
+
     private static CodeNode makeNode(String id, NodeKind kind, String label, String filePath) {
         CodeNode node = new CodeNode(id, kind, label);
         node.setFilePath(filePath);