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_gitea_client.py

@@ -20,11 +20,11 @@ def _client() -> GiteaClient:
     )
 
 
-def _resp(body, status: int = 200) -> MagicMock:
+def _resp(body: object, status: int = 200) -> MagicMock:
     resp = MagicMock()
     resp.read.return_value = json.dumps(body).encode() if body is not None else b""
     resp.status = status
-    resp.__enter__ = lambda s: s
+    resp.__enter__ = lambda s: s  # type: ignore
     resp.__exit__ = MagicMock(return_value=False)
     return resp