test(harness): isolate imports and stabilize browser and DNS fixtures

tests/test_fenced_inline_args.py

@@ -5,41 +5,7 @@ with the args on the same line as the tag; the parser must execute those. The
 relaxed tag pattern must NOT prefix-match longer fence tags: ```python3 is a
 language hint, not a "python" tool call with content "3\n...".
 """
-import sys
-from unittest.mock import MagicMock
-
-# This module needs the real agent-tool stack; importing it pulls in heavy
-# DB/auth deps, so we stub those just long enough to import, then restore them.
-# We deliberately do NOT pop src.tool_execution: popping and re-importing it
-# rebinds the `src` package's `tool_execution` attribute, so a later
-# `import src.tool_execution as te` resolves to a different module object than
-# the one its functions live in - which silently breaks tests that monkeypatch
-# it (e.g. test_edit_file's admin gate) and breaks request-scoped ContextVars.
-_ABSENT = object()
-_AGENT_MODULES = ["src.agent_tools", "src.tool_parsing", "src.tool_schemas"]
-_STUBBED = [
-    "sqlalchemy", "sqlalchemy.orm", "sqlalchemy.ext", "sqlalchemy.ext.declarative",
-    "sqlalchemy.ext.hybrid", "sqlalchemy.sql", "sqlalchemy.sql.expression",
-    "src.database", "core.models", "core.database", "core.auth",
-]
-_saved_stubs = {name: sys.modules.get(name, _ABSENT) for name in _STUBBED}
-
-for _mod in _AGENT_MODULES:
-    sys.modules.pop(_mod, None)
-for _mod in _STUBBED:
-    if _mod not in sys.modules:
-        sys.modules[_mod] = MagicMock()
-
-import src.agent_tools  # noqa: E402, F401
-from src.tool_parsing import parse_tool_blocks, strip_tool_blocks  # noqa: E402
-
-# Drop the stubs we installed so they do not leak into later tests.
-for _name, _original in _saved_stubs.items():
-    if _original is _ABSENT:
-        sys.modules.pop(_name, None)
-    else:
-        sys.modules[_name] = _original
-
+from src.tool_parsing import parse_tool_blocks, strip_tool_blocks
 
 def test_inline_args_on_tag_line_parse():
     # The original bug: ```list_email_accounts {}  (args on the tag line)