fix(egress): break circular import with manifest via TYPE_CHECKING

manifest → agent_provider → egress → manifest created a cycle that
caused ImportError on any module import. With from __future__ import
annotations already present, Bottle is only needed at type-check time
(annotations are lazy strings under PEP 563).

Assisted-by: Claude Code

bot_bottle/egress.py

@@ -27,9 +27,12 @@ from __future__ import annotations
 from abc import ABC, abstractmethod
 from dataclasses import dataclass
 from pathlib import Path
+from typing import TYPE_CHECKING
 
 from .log import die
-from .manifest import Bottle
+
+if TYPE_CHECKING:
+    from .manifest import Bottle
 
 CODEX_HOST_CREDENTIAL_TOKEN_REF = "BOT_BOTTLE_CODEX_HOST_ACCESS_TOKEN"