TaskCreate/TaskUpdate system reminders are too frequent and add context noise

Problem

When using Claude Code with the task tools (TaskCreate, TaskUpdate), the system injects periodic reminders like:

"The task tools haven't been used recently. If you're working on tasks that would benefit from tracking progress, consider using TaskCreate..."

These fire very frequently — often every 2-3 tool calls — even when the current work doesn't warrant task tracking (e.g., single-file edits, quick lookups, conversational exchanges).

Impact

• Context pollution: Each reminder consumes tokens in the context window, reducing space for actual work
• Noise for plugin authors: Plugins that use hooks (SessionStart, PreToolUse, PostToolUse) already manage their own task workflows. The system reminders compete with plugin-driven task management
• Breaks flow: When doing rapid file edits, seeing "task tools haven't been used recently" after every edit is distracting

Suggested fix

• Option A: Make the reminder frequency configurable (e.g., settings.json → taskReminderInterval: "never" | "low" | "default")
• Option B: Only show the reminder once per session, not repeatedly
• Option C: Suppress reminders when a plugin has registered task-related hooks (indicating it handles task management)

Environment

• Claude Code CLI
• Using plugins with PostToolUse hooks that manage task state independently
• High-frequency tool use sessions (50+ tool calls)

cc @bcherny