Add regression tests for the member call defer fix

Covers the issue's own repro, a delegating wrapper that no longer
self loops and an unrelated same named sibling that no longer steals
the edge, plus three controls: a bare unqualified call still
resolves by name, this dot calls still bind through the caller's own
class, and a TypeScript typed receiver still resolves through its
declared type. A fourth control checks that a factory object's own
sibling methods still call each other, the one legitimate case that
keeps resolving locally instead of deferring.

tests/test_js_member_call_bare_name_fallback.py

@@ -0,0 +1,114 @@
+"""#4598: a JS/TS member call must not fall back to a same-file bare-name match.
+
+`receiver.name(...)` used to resolve to a function called `name` declared
+anywhere in the same file, ignoring the receiver entirely. Inside a
+delegating wrapper this fabricated an EXTRACTED `calls` self-loop; more
+generally it could bind to any unrelated same-named function in the file.
+"""
+from __future__ import annotations
+
+import warnings
+from pathlib import Path
+
+from graphify.extract import extract
+
+
+def _extract(tmp_path: Path, files: dict[str, str]) -> dict:
+    for name, src in files.items():
+        (tmp_path / name).write_text(src, encoding="utf-8")
+    with warnings.catch_warnings():
+        warnings.simplefilter("ignore")
+        return extract([tmp_path / n for n in files], cache_root=tmp_path, parallel=False)
+
+
+def _calls(r: dict) -> set[tuple[str, str]]:
+    label = {n["id"]: n["label"] for n in r["nodes"]}
+    return {
+        (label.get(e["source"]), label.get(e["target"]))
+        for e in r["edges"] if e["relation"] == "calls"
+    }
+
+
+def test_delegating_wrapper_does_not_self_loop(tmp_path):
+    r = _extract(tmp_path, {
+        "app.js": (
+            'import { createHistory } from "./history.js";\n'
+            "const history = createHistory();\n\n"
+            "export function appendFrame(entry) {\n"
+            "  return history.appendFrame(entry);\n"
+            "}\n\n"
+            "export function confirm(message) {\n"
+            "  return window.confirm(message);\n"
+            "}\n"
+        ),
+        "history.js": (
+            "export function createHistory() {\n"
+            "  return { appendFrame: (e) => e };\n"
+            "}\n"
+        ),
+    })
+    calls = _calls(r)
+    assert ("appendFrame()", "appendFrame()") not in calls
+    assert ("confirm()", "confirm()") not in calls
+    assert not [t for s, t in calls if s == t], calls
+
+
+def test_receiver_call_does_not_bind_to_an_unrelated_sibling(tmp_path):
+    # `addFrame` delegates to `history.appendFrame()`; a totally unrelated
+    # `appendFrame` function also lives in the file. The bare-name map used
+    # to bind the call to that sibling instead of leaving it unresolved.
+    r = _extract(tmp_path, {"app.js": (
+        "function appendFrame(entry) { return entry; }\n\n"
+        "function addFrame(history, entry) {\n"
+        "  return history.appendFrame(entry);\n"
+        "}\n"
+    )})
+    calls = _calls(r)
+    assert ("addFrame()", "appendFrame()") not in calls
+
+
+def test_bare_unqualified_call_is_unaffected(tmp_path):
+    # No receiver at all: resolving by name is correct and must keep working.
+    r = _extract(tmp_path, {"app.js": (
+        "function helper(x) { return x; }\n"
+        "function run(x) { return helper(x); }\n"
+    )})
+    assert ("run()", "helper()") in _calls(r)
+
+
+def test_this_method_call_is_unaffected(tmp_path):
+    # `this.m()` is self_receiver, resolved through the caller's own class,
+    # not the deferred member-call path this issue is about.
+    r = _extract(tmp_path, {"app.js": (
+        "class Wrapper {\n"
+        "  run(entry) { return this.appendFrame(entry); }\n"
+        "  appendFrame(entry) { return entry; }\n"
+        "}\n"
+    )})
+    assert (".run()", ".appendFrame()") in _calls(r)
+
+
+def test_ts_typed_receiver_still_resolves_through_its_own_type(tmp_path):
+    r = _extract(tmp_path, {
+        "greeter.ts": "export class Greeter {\n  greet(): void {}\n}\n",
+        "app.ts": (
+            'import { Greeter } from "./greeter";\n'
+            "export function run(g: Greeter) {\n  g.greet();\n}\n"
+        ),
+    })
+    assert ("run()", ".greet()") in _calls(r)
+
+
+def test_factory_object_sibling_call_is_unaffected(tmp_path):
+    # #1322/#3408's own pattern: methods assigned onto a local factory object
+    # calling each other through that same object must keep resolving --
+    # this is a genuine, already-scoped sibling call, not a guess.
+    r = _extract(tmp_path, {"store.js": (
+        "function makeStore() {\n"
+        "  const store = {};\n"
+        "  store.get = (k) => k;\n"
+        "  store.set = (k, v) => store.get(k);\n"
+        "  return store;\n"
+        "}\n"
+    )})
+    assert (".set()", ".get()") in _calls(r)