fix(tests): resolve pyright strict errors in forge test helpers

CI runs `pyright .` over the whole repo including tests; the earlier
run only checked the source paths. The test helpers used `**over`
dict-splat into typed constructors, which pyright strict rejects.

- forge_state: build a typed ForgeState base and dataclasses.replace(**over)
- provenance: explicit typed keyword params instead of a **over dict
- resume: _launch_kwargs returns dict[str, Any] (copy call_args.kwargs)
- forge_base: assert PermissionError in __mro__ (avoids always-true issubclass)
- client: annotate _resp body param; type: ignore the mock __enter__ lambda

pyright . now 0 errors; 47 tests still pass; pylint 9.97/10.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WL77TgFxKbs3cidGMG9dz7

tests/unit/test_contrib_forge_base.py

@@ -88,7 +88,7 @@ class TestScopedForgeWrites(unittest.TestCase):
 
     def test_scope_error_is_permission_error(self):
         # Sidecars can catch the stdlib base type.
-        self.assertTrue(issubclass(ForgeScopeError, PermissionError))
+        self.assertIn(PermissionError, ForgeScopeError.__mro__)
 
 
 if __name__ == "__main__":