chore(tests): remove unused fixtures divergent_repo and fake_bun_binary

Dead code — neither fixture nor _git helper was referenced by any test.
Also drop now-unused os/stat imports and duplicate pytest import.

tests/conftest.py

@@ -2,8 +2,6 @@
 
 import json
 import logging
-import os
-import stat
 import subprocess
 import sys
 import time
@@ -25,8 +23,6 @@ for _mod in (
     if _mod not in sys.modules:
         sys.modules[_mod] = unittest.mock.MagicMock()
 
-import pytest
-
 logger = logging.getLogger(__name__)
 
 COORDINATOR_URL = "http://localhost:8210"
@@ -159,70 +155,3 @@ def gpu_settings():
     )
 
 
-def _git(args: list[str], cwd: Path) -> None:
-    subprocess.run(["git"] + args, cwd=cwd, check=True, capture_output=True)
-
-
-@pytest.fixture
-def divergent_repo(tmp_path: Path) -> Path:
-    """Repo whose local branch and origin/main have diverged on bun.lock.
-
-    Layout after setup:
-      local main  — initial commit + local-only commit (edits bun.lock)
-      origin/main — initial commit + remote-only commit (edits bun.lock differently)
-    Fetching makes local 1 ahead, 1 behind with a guaranteed bun.lock conflict on rebase.
-    """
-    bare = tmp_path / "remote.git"
-    local = tmp_path / "local"
-
-    subprocess.run(["git", "init", "--bare", str(bare)], check=True, capture_output=True)
-
-    local.mkdir()
-    _git(["init"], local)
-    _git(["config", "user.email", "test@test.com"], local)
-    _git(["config", "user.name", "Test User"], local)
-    _git(["remote", "add", "origin", str(bare)], local)
-
-    # Shared base commit
-    (local / "bun.lock").write_text("# lockfile v0\n[[packages]]\n")
-    (local / "package.json").write_text('{"name":"test","version":"1.0.0"}\n')
-    _git(["add", "."], local)
-    _git(["commit", "-m", "Initial commit"], local)
-    _git(["push", "-u", "origin", "master"], local)
-
-    # Remote diverges: adds a dep
-    other = tmp_path / "other"
-    subprocess.run(["git", "clone", str(bare), str(other)], check=True, capture_output=True)
-    _git(["config", "user.email", "test@test.com"], other)
-    _git(["config", "user.name", "Test User"], other)
-    (other / "bun.lock").write_text("# lockfile v0\n[[packages]]\nremote-dep = '1.0.0'\n")
-    _git(["add", "bun.lock"], other)
-    _git(["commit", "-m", "remote: add remote-dep"], other)
-    _git(["push", "origin", "master"], other)
-
-    # Local diverges: adds a different dep
-    (local / "bun.lock").write_text("# lockfile v0\n[[packages]]\nlocal-dep = '2.0.0'\n")
-    _git(["add", "bun.lock"], local)
-    _git(["commit", "-m", "local: add local-dep"], local)
-
-    # Fetch so origin/master is known locally (but do NOT pull — we want divergence)
-    _git(["fetch", "origin"], local)
-
-    return local
-
-
-@pytest.fixture
-def fake_bun_binary(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> Path:
-    """Install a stub `bun` script on PATH that exits 0 and writes a clean lockfile."""
-    bin_dir = tmp_path / "stub-bin"
-    bin_dir.mkdir()
-    bun = bin_dir / "bun"
-    bun.write_text(
-        "#!/bin/sh\n"
-        # Write a clean lockfile to the cwd so git add succeeds
-        "printf '# lockfile v0\\n[[packages]]\\n' > bun.lock\n"
-        "exit 0\n"
-    )
-    bun.chmod(bun.stat().st_mode | stat.S_IEXEC | stat.S_IXGRP | stat.S_IXOTH)
-    monkeypatch.setenv("PATH", f"{bin_dir}:{os.environ['PATH']}")
-    return bun