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Introduces `crewai/hooks/dispatch.py` as a single engine behind every interception point: a hook receives a typed context, may mutate or replace its `payload`, or raise `HookAborted(reason, source)` to stop the operation. The full `InterceptionPoint` catalog is frozen from day zero, with global and contextvar-scoped registries, an `@on` decorator, a no-op fast path, and a `HookDispatchedEvent` for telemetry. The four existing `before/after_llm_call` and `before/after_tool_call` hooks become adapters over the dispatcher, so the legacy dialect and `return False` semantics keep working unchanged while gaining the new contract.