sontianye f08de72f18 feat(agent): add CompositeHook for composable lifecycle hooks
Introduce a CompositeHook that fans out lifecycle callbacks to an
ordered list of AgentHook instances with per-hook error isolation.
Extract the nested _LoopHook and _SubagentHook to module scope as
public LoopHook / SubagentHook so downstream users can subclass or
compose them.  Add `hooks` parameter to AgentLoop.__init__ for
registering custom hooks at construction time.

Closes #2603
2026-03-31 02:19:29 +08:00
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