Phase 7: netfox + godot-jolt stack upgrade

Stack installed:
- netfox v1.35.3 (core + extras + noray + internals)
- godot-jolt v0.16.0-stable

Architecture:
- Server: ENet transport (works headless, no netfox deps)
- Client/Editor: netfox rollback (RollbackSynchronizer, TickInterpolator)

New/modified:
- docs/migration-netfox-plan.md — migration architecture
- scripts/network/network_manager.gd — netfox-aware ENet fallback
- scripts/network/player.gd — clean base player
- client/characters/player_netfox.gd — rollback player w/ WeaponManager
- client/characters/input/player_net_input.gd — BaseNetInput subclass
- client/characters/character/fps_character_controller.gd — netfox input feed
- client/weapons/ — weapon data, registry, TacticalWeaponHitscan, WeaponManager
- client/scripts/round_replicator.gd — client-side round state bridge
- server/scripts/round_manager.gd — improved state machine
- server/scripts/plugin_api/plugin_manager.gd — refined plugin system
- config: enemy_tag, ally_tag for meatball targeting

Removed: old C++ SimulationServer GDExtension (replaced by netfox rollback)

server/server-browser-api/venv/lib/python3.11/site-packages/aiosqlite/context.py

@@ -0,0 +1,56 @@
+# Copyright Amethyst Reese
+# Licensed under the MIT license
+
+
+from collections.abc import Coroutine, Generator
+from contextlib import AbstractAsyncContextManager
+from functools import wraps
+from typing import Any, Callable, TypeVar
+
+from .cursor import Cursor
+
+_T = TypeVar("_T")
+
+
+class Result(AbstractAsyncContextManager[_T], Coroutine[Any, Any, _T]):
+    __slots__ = ("_coro", "_obj")
+
+    def __init__(self, coro: Coroutine[Any, Any, _T]):
+        self._coro = coro
+        self._obj: _T
+
+    def send(self, value) -> None:
+        return self._coro.send(value)
+
+    def throw(self, typ, val=None, tb=None) -> None:
+        if val is None:
+            return self._coro.throw(typ)
+
+        if tb is None:
+            return self._coro.throw(typ, val)
+
+        return self._coro.throw(typ, val, tb)
+
+    def close(self) -> None:
+        return self._coro.close()
+
+    def __await__(self) -> Generator[Any, None, _T]:
+        return self._coro.__await__()
+
+    async def __aenter__(self) -> _T:
+        self._obj = await self._coro
+        return self._obj
+
+    async def __aexit__(self, exc_type, exc, tb) -> None:
+        if isinstance(self._obj, Cursor):
+            await self._obj.close()
+
+
+def contextmanager(
+    method: Callable[..., Coroutine[Any, Any, _T]],
+) -> Callable[..., Result[_T]]:
+    @wraps(method)
+    def wrapper(self, *args, **kwargs) -> Result[_T]:
+        return Result(method(self, *args, **kwargs))
+
+    return wrapper