Hook-Driven Automation overview

Hook-Driven Automation as a cross-cutting topic - using pre/post tool-use hooks, session start/end hooks, stop hooks, and notification hooks to automate agent behavior without modifying the agent's core logic. Covers PreToolUse hooks for approval and input mutation, PostToolUse hooks for side-effects and logging, Stop hooks for driving orchestration loops (the babysitter harness pattern), SessionStart hooks for context injection, and the hooks-adapter fan-out/merge architecture that aggregates results from multiple hook sources into a single decision.