fix(cmind): handle list meta.path in GraphQueryEngine search - #105

Summary

search_rpg crashes with 'list' object has no attribute 'lower' on any graph that has been through run_update_rpg.

RPGService.enrich_from_code (called with align_only=True from run_update_rpg) still runs _enrich_group_paths and _enrich_l1_paths. When a feature group spans more than one file, or a functional area spans more than one directory, those steps store meta.path as a sorted list. The rest of the package already accepts that shape (paths = p if isinstance(p, list) else [p] in service.py and models.py). GraphQueryEngine was the reader that still assumed a string.

Two consequences in _search_rpg_tree:

• ":" in meta_path on a list is a membership test, not a substring test, so the path is left as a list.
• file_part.lower() then raises AttributeError.

The same list also crashes _normalize_path via .startswith when _dep_graph_code_dir is set. Search, node detail, and tree listing all go through that helper.

scope="code" was unaffected. scope="all" (the default) was not, because it also searches the feature tree.

Fix

• Match the query against every entry of a list path, using the same isinstance(..., list) idiom as the writers.
• Normalise a list path entry by entry in _normalize_path, so the legacy code-dir prefix is stripped from each one. A list stays a list in the result.

Reproduction

from rpg.graph_query import GraphQueryEngine

rpg = {"root": {"id": "repo", "name": "brain", "node_type": "repo", "meta": {"path": "."},
    "children": [{"id": "area", "name": "Inference Serving", "node_type": "functional_area",
        "meta": {"path": ["services/inference", "api/inference"]}, "children": []}]}}
engine = GraphQueryEngine(rpg, {"nodes": {}, "edges": []})
engine.search("inference", scope="feature")
# AttributeError: 'list' object has no attribute 'lower'

Tests

CoderMind/tests/test_graph_query_meta_path.py fails on main with the .lower() and .startswith errors, and passes with this change. test_path_format.py is unchanged and still passes.

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