java: generated javadoc under target/ is indexed as a JavaScript project, so a Maven repo gets a second language graph #1545

Symptom

A Maven project whose target/ holds generated javadoc (mvn javadoc:javadoc writes target/site/apidocs/script.js) is indexed as a Java + JavaScript repository. The JavaScript files under target/ get their own graph and every query also asks it. The Java walker skips target/. Measured on 0.1.3 at 0df257c; the MCP axiomcode_index tool reports graph up to date (java, javascript).

$ axiomcode index
building java + javascript graphs for . … (java 1 · typescript 0 · python 0 · javascript 1 · csharp 0 files)
$ axiomcode impact createElem
══ javascript graph ══   (.axiomcode/lang/javascript)
    [resolved] loadScripts   target/site/apidocs/script.js:3   -- calls it

Control: the same tree without target/ prints building java graph ... (java 1 · ... javascript 0 ...).

Reproduction

pom.xml (groupId example, no dependencies), src/main/java/app/WidgetValidator.java (any class), and target/site/apidocs/script.js:

var moduleSearchIndex;
function loadScripts(doc, tag) {
    createElem(doc, tag, 'search.js');
}
function createElem(doc, tag, path) {
    var script = doc.createElement(tag);
    script.src = path;
}

Root cause

parser/src/constants/javascript-constants.ts:125-128 (JS_SKIP_DIRECTORIES) has no target, while the Java walk's EXCLUDED_DIRS (parser/src/constants/consts.ts:11-24) does. plugins/axiomcode/skills/axiomcode/scripts/axiomcode-build:55 (count) does not prune target either, so lines 67-70 add javascript to LANGS from one file under it.

Expected

In a Maven project, files under the build output directory target/ do not add a language graph, as the control shows.