Implements hook that tracks whether explore/librarian agents have been used in a session.
When target tools (Grep, Glob, WebFetch, context7, websearch_exa, grep_app) are called
without prior agent usage, appends reminder message recommending parallel background_task calls.
State persists across tool calls and resets on session compaction, allowing fresh reminders
after context compaction - similar to directory-readme-injector pattern.
Files:
- src/hooks/agent-usage-reminder/: New hook implementation
- types.ts: AgentUsageState interface
- constants.ts: TARGET_TOOLS, AGENT_TOOLS, REMINDER_MESSAGE
- storage.ts: File-based state persistence with compaction handling
- index.ts: Hook implementation with tool.execute.after and event handlers
- src/config/schema.ts: Add 'agent-usage-reminder' to HookNameSchema
- src/hooks/index.ts: Export createAgentUsageReminderHook
- src/index.ts: Instantiate and register hook handlers
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