diff --git a/graphify/extract.py b/graphify/extract.py
index 1d396a69..5caaaa3a 100644
--- a/graphify/extract.py
+++ b/graphify/extract.py
@@ -85,6 +85,16 @@ def _file_stem(path: Path) -> str:
     return path.stem
 
 
+def _file_node_id(rel_path: Path) -> str:
+    """File-level node ID matching the skill.md spec: ``{parent_dir}_{stem}`` —
+    one parent directory level, no extension. ``rel_path`` MUST be relative to
+    the project root so top-level files collapse to a bare stem (``setup.py`` ->
+    ``setup``) instead of picking up the root directory name. This must equal the
+    ID semantic subagents generate, or AST and semantic extraction split a file
+    into two disconnected ghost nodes (#1033)."""
+    return _make_id(_file_stem(rel_path))
+
+
 _TSCONFIG_ALIAS_CACHE: dict[str, dict[str, str]] = {}
 _WORKSPACE_PACKAGE_CACHE: dict[str, dict[str, Path]] = {}
 _JS_CACHE_BYPASS_SUFFIXES = {".js", ".jsx", ".mjs", ".ts", ".tsx", ".vue", ".svelte"}
@@ -10370,15 +10380,22 @@ def extract(
 
     _augment_symbol_resolution_edges(paths, all_nodes, all_edges, root)
 
-    # Remap file node IDs from absolute-path-derived to project-relative so
-    # graph.json edge endpoints are stable across machines (#502)
+    # Remap file node IDs from absolute-path-derived to the canonical
+    # {parent_dir}_{stem} spec form so (a) graph.json edge endpoints are stable
+    # across machines (#502) and (b) AST file nodes match the IDs semantic
+    # subagents generate (#1033). Resolve before relativizing so paths passed in
+    # relative form still anchor to the (resolved) root.
     id_remap: dict[str, str] = {}
     for path in paths:
         old_id = _make_id(str(path))
         try:
-            new_id = _make_id(str(path.relative_to(root)))
+            rel = path.relative_to(root)
         except ValueError:
-            continue
+            try:
+                rel = path.resolve().relative_to(root)
+            except ValueError:
+                continue
+        new_id = _file_node_id(rel)
         if old_id != new_id:
             id_remap[old_id] = new_id
     if id_remap:
@@ -10462,7 +10479,7 @@ def extract(
             sf_rel = sf_path.relative_to(root) if sf_path.is_absolute() else sf_path
         except ValueError:
             sf_rel = sf_path
-        nid_to_file_nid[n["id"]] = _make_id(str(sf_rel))
+        nid_to_file_nid[n["id"]] = _file_node_id(sf_rel)
 
     existing_pairs = {(e["source"], e["target"]) for e in all_edges}
     for rc in all_raw_calls:
diff --git a/graphify/symbol_resolution.py b/graphify/symbol_resolution.py
index 7bc68093..39cc60f0 100644
--- a/graphify/symbol_resolution.py
+++ b/graphify/symbol_resolution.py
@@ -365,14 +365,24 @@ def _bash_make_id(*parts: str) -> str:
     return cleaned.strip("_").casefold()
 
 
+def _bash_file_stem(rel_path: Path) -> str:
+    """Exact copy of extract._file_stem — kept here to avoid an import cycle."""
+    parent = rel_path.parent.name
+    if parent and parent not in (".", ""):
+        return f"{parent}.{rel_path.stem}"
+    return rel_path.stem
+
+
 def _file_node_id_for_path(path: Path, root: Path) -> str:
-    # Resolve both sides so callers that pass relative or non-canonical roots
-    # get the same canonical relative path that extract()'s id_remap produces.
-    # _bash_make_id is an exact copy of extract._make_id, so IDs match.
+    # Produce the canonical {parent_dir}_{stem} file-node ID that extract()'s
+    # id_remap generates (#1033), so bash `source` edges land on the real file
+    # node instead of an orphan. _bash_make_id / _bash_file_stem are exact copies
+    # of extract._make_id / extract._file_stem, so IDs match.
     try:
-        return _bash_make_id(str(path.resolve().relative_to(root.resolve())))
+        rel = path.resolve().relative_to(root.resolve())
     except ValueError:
         return _bash_make_id(str(path))  # path outside root: hash absolute path as fallback
+    return _bash_make_id(_bash_file_stem(rel))
 
 
 def resolve_bash_source_edges(
diff --git a/tests/test_file_node_id_spec.py b/tests/test_file_node_id_spec.py
new file mode 100644
index 00000000..42505667
--- /dev/null
+++ b/tests/test_file_node_id_spec.py
@@ -0,0 +1,112 @@
+"""Regression tests for issue #1033: AST file-level node IDs must match the
+skill.md `{parent_dir}_{stem}` spec (one parent level, no extension) so AST and
+semantic extraction produce the SAME node for a file instead of two disconnected
+ghosts.
+
+skill.md spec (line ~390):
+    stem = {parent_dir}_{filename_without_ext}, lowercased, non-alphanumeric -> _
+    examples:
+        src/auth/session.py + ValidateToken -> auth_session_validatetoken
+        match/script/pipeline_step.py (file node) -> script_pipeline_step
+        setup.py (top-level) -> setup
+"""
+from pathlib import Path
+
+from graphify.extract import extract
+
+
+def _file_nodes(extraction: dict) -> list[dict]:
+    # File-level nodes carry a label equal to the file's basename.
+    return [
+        n for n in extraction["nodes"]
+        if n.get("source_file", "").endswith(n.get("label", "\0"))
+        and n.get("file_type") == "code"
+    ]
+
+
+def test_file_node_id_uses_parent_dir_and_stem_no_extension(tmp_path):
+    """match/script/pipeline_step.py -> file node id 'script_pipeline_step'."""
+    sub = tmp_path / "match" / "script"
+    sub.mkdir(parents=True)
+    f = sub / "pipeline_step.py"
+    f.write_text("def run():\n    pass\n")
+
+    extraction = extract([f], cache_root=tmp_path)
+    ids = {n["id"] for n in extraction["nodes"]}
+
+    assert "script_pipeline_step" in ids, (
+        f"expected spec-format file id 'script_pipeline_step', got {sorted(ids)}"
+    )
+    # The old buggy full-path-with-extension id must be gone.
+    assert "match_script_pipeline_step_py" not in ids
+    assert not any(i.endswith("_py") for i in ids if "pipeline_step" in i)
+
+
+def test_top_level_file_node_id_is_bare_stem(tmp_path):
+    """A file directly at the project root collapses to just its stem."""
+    f = tmp_path / "setup.py"
+    f.write_text("def configure():\n    pass\n")
+
+    extraction = extract([f], cache_root=tmp_path)
+    ids = {n["id"] for n in extraction["nodes"]}
+
+    assert "setup" in ids, f"expected bare stem 'setup', got {sorted(ids)}"
+    assert "setup_py" not in ids
+
+
+def test_symbol_and_file_ids_share_the_same_stem(tmp_path):
+    """Symbol ids already use {parent}_{stem}_{name}; the file node must share
+    that stem prefix so 'contains' edges connect file -> symbol."""
+    sub = tmp_path / "match" / "script"
+    sub.mkdir(parents=True)
+    f = sub / "pipeline_step.py"
+    f.write_text("def run():\n    pass\n\nclass Stage:\n    pass\n")
+
+    extraction = extract([f], cache_root=tmp_path)
+    ids = {n["id"] for n in extraction["nodes"]}
+
+    assert "script_pipeline_step" in ids          # file node
+    assert "script_pipeline_step_stage" in ids     # class symbol shares stem
+
+    # The file -> class 'contains' edge must reference the real file node id.
+    contains = [
+        e for e in extraction["edges"]
+        if e["relation"] == "contains" and e["target"] == "script_pipeline_step_stage"
+    ]
+    assert contains, "no 'contains' edge to the class symbol"
+    assert contains[0]["source"] == "script_pipeline_step", (
+        f"contains edge source {contains[0]['source']!r} does not match file node"
+    )
+
+
+def test_cross_file_import_edges_stay_connected(tmp_path):
+    """Changing the file-id format must not orphan import edges: the import
+    target must resolve to the imported file's (new-format) node id."""
+    pkg = tmp_path / "pkg"
+    pkg.mkdir()
+    (pkg / "models.py").write_text("class User:\n    pass\n")
+    (pkg / "auth.py").write_text(
+        "from models import User\n\n"
+        "class Session:\n"
+        "    def check(self):\n"
+        "        return User()\n"
+    )
+
+    files = [pkg / "models.py", pkg / "auth.py"]
+    extraction = extract(files, cache_root=tmp_path)
+    ids = {n["id"] for n in extraction["nodes"]}
+
+    assert "pkg_models" in ids
+    assert "pkg_auth" in ids
+
+    # Every edge endpoint that looks like a file node must point at a real node
+    # (no dangling '*_py' ghosts left behind by the old format).
+    node_ids = ids
+    for e in extraction["edges"]:
+        for endpoint in (e["source"], e["target"]):
+            assert not endpoint.endswith("_py"), (
+                f"edge endpoint {endpoint!r} kept the old extension-suffixed format"
+            )
+        # imports_from edges between files must land on a known node.
+        if e["relation"] == "imports_from" and e["source"] == "pkg_auth":
+            assert e["target"] in node_ids or "models" in e["target"]
diff --git a/tests/test_js_import_resolution.py b/tests/test_js_import_resolution.py
index 414cf8d8..e2efbcee 100644
--- a/tests/test_js_import_resolution.py
+++ b/tests/test_js_import_resolution.py
@@ -3,7 +3,7 @@ from __future__ import annotations
 import json
 from pathlib import Path
 
-from graphify.extract import _file_stem, _make_id, extract
+from graphify.extract import _file_node_id, _file_stem, _make_id, extract
 
 
 def _write(path: Path, text: str) -> Path:
@@ -17,7 +17,7 @@ def _extract_for(paths: list[Path], root: Path):
 
 
 def _has_edge(result: dict, source: str, target: str, relation: str = "imports_from") -> bool:
-    expected = (_make_id(source), _make_id(target), relation)
+    expected = (_file_node_id(Path(source)), _file_node_id(Path(target)), relation)
     actual = {
         (edge["source"], edge["target"], edge["relation"])
         for edge in result["edges"]
@@ -32,7 +32,7 @@ def _has_symbol_edge(
     symbol: str,
     relation: str = "imports",
 ) -> bool:
-    expected = (_make_id(source), _make_id(_file_stem(Path(target_file)), symbol), relation)
+    expected = (_file_node_id(Path(source)), _make_id(_file_stem(Path(target_file)), symbol), relation)
     actual = {
         (edge["source"], edge["target"], edge["relation"])
         for edge in result["edges"]