fix: resolve pyright type errors

- Fix launch.py provision callable signature to accept Bottle not str
- Rename _prompt_path to prompt_path to make it public (not protected)
- Fix PromptMode type handling in bottle.py files
- Update WorkspaceSpec protocol to use read-only properties for compatibility with frozen BottleSpec
- Fix pty_resize signal handler type annotation
- Update local_registry.py contextmanager return type to Generator (not Iterator)

These changes fix ~130 pyright errors related to type safety.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

bot_bottle/workspace.py

@@ -13,8 +13,15 @@ DEFAULT_WORKSPACE_MODE = "755"
 
 
 class WorkspaceSpec(Protocol):
-    copy_cwd: bool
-    user_cwd: str
+    @property
+    def copy_cwd(self) -> bool:
+        """Whether to copy the current working directory."""
+        ...
+
+    @property
+    def user_cwd(self) -> str:
+        """The user's current working directory."""
+        ...
 
 
 @dataclass(frozen=True)