[gobby-cli-#1008] fix: exclude docs directory from codewiki is_core_file filter

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

Author: joshwilhelmi

crates/gcode/src/commands/codewiki/paths.rs

@@ -127,6 +127,7 @@ pub(crate) fn is_core_file(file: &str) -> bool {
                 | "target"
                 | "node_modules"
                 | "tmp"
+                | "docs"
         )
     })
 }

crates/gcode/src/commands/codewiki/tests/graph.rs

@@ -157,7 +157,7 @@ fn core_file_filter_excludes_hidden_metadata_paths() {
         assert!(!is_core_file(file), "{file} should be filtered out");
     }
 
-    assert!(is_core_file("docs/guides/codewiki.md"));
+    assert!(is_core_file("crates/gcode/src/main.rs"));
 }
 
 #[test]
@@ -173,6 +173,19 @@ fn core_file_filter_excludes_tmp_directories() {
     assert!(is_core_file("crates/gcode/src/main.rs"));
 }
 
+#[test]
+fn core_file_filter_excludes_docs_directories() {
+    for file in [
+        "docs/evidence/wiki-parity-2026-06/wp3-compile-source.json",
+        "docs/guides/codewiki.md",
+        "docs/README.md",
+    ] {
+        assert!(!is_core_file(file), "{file} should be filtered out");
+    }
+
+    assert!(is_core_file("crates/gcode/src/main.rs"));
+}
+
 #[test]
 fn import_targets_match_exact_path_or_module_components() {
     let files = vec![