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_cli_resume_headless.py

@@ -8,6 +8,7 @@ core (`assume_yes` + `headless_prompt_text`) as `start --headless`.
 from __future__ import annotations
 
 import unittest
+from typing import Any
 from unittest.mock import MagicMock, patch
 
 import bot_bottle.cli.resume as resume_mod
@@ -40,9 +41,9 @@ class ResumeHeadlessTest(unittest.TestCase):
         ).start()
         self.addCleanup(patch.stopall)
 
-    def _launch_kwargs(self) -> dict:
+    def _launch_kwargs(self) -> dict[str, Any]:
         self._launch.assert_called_once()
-        return self._launch.call_args.kwargs
+        return dict(self._launch.call_args.kwargs)
 
     def test_headless_passes_assume_yes_and_prompt(self):
         rc = resume_mod.cmd_resume(