fix: resolve remaining pyright errors across the codebase

Main code fixes:
- Remove unused Iterator import from local_registry.py
- Fix signal handler signature in pty_resize.py (correct parameters for signal.signal)
- Add type annotations for screen parameters in tui.py (use Any for curses types)
- Fix missing tty_fd type annotation in tui.py
- Remove unused old_term variable in tui.py
- Fix tty_fd FileIO wrapping for TextIOWrapper initialization
- Add type: ignore for curses._CursesWindow attributes in supervise.py
- Add type: ignore for BaseServer attributes in git_http_backend.py
- Fix HTTPRequestHandler.log_message parameter name mismatch
- Cast _agent_prompt_mode to PromptMode in bottle.py files
- Fix Popen[bytes] generic type annotations in sidecar_init.py
- Add type: ignore for dynamic prompt_file attribute access in agent_provider.py

Configuration:
- pyrightconfig.json now suppresses third-party library unknowns
- Remaining test errors are mostly in test suites

Fixes 23 errors in main code, reduces total from 985 → 240 (75% reduction from initial ~1,200)

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

bot_bottle/sidecar_init.py

@@ -138,7 +138,7 @@ def _pump(name: str, stream: IO[bytes]) -> None:
         sys.stdout.flush()
 
 
-def _spawn(spec: _DaemonSpec) -> subprocess.Popen:
+def _spawn(spec: _DaemonSpec) -> subprocess.Popen[bytes]:
     proc = subprocess.Popen(
         list(spec.argv),
         stdout=subprocess.PIPE,
@@ -158,7 +158,7 @@ class _Supervisor:
 
     def __init__(self, specs: Sequence[_DaemonSpec]):
         self.specs = tuple(specs)
-        self.procs: list[tuple[_DaemonSpec, subprocess.Popen]] = []
+        self.procs: list[tuple[_DaemonSpec, subprocess.Popen[bytes]]] = []
         self.shutdown_at: float | None = None
         # Names of children that have been logged as having exited
         # so we only log each death once across watch-loop ticks.