[FEATURE] Reduce context consumption from system reminders

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

System reminders are injected into every message exchange and consume significant context, especially during rapid back-and-forth conversations (like test result logging).

Issues observed:

File modification reminders repeat full file contents even when unchanged
Reminders like TodoWrite nudges appear even when irrelevant to current workflow
No user control to disable/configure reminder types

Proposed Solution

Suggestions:

Don't repeat unchanged file contents in modification reminders
Allow users to disable specific reminder categories (via settings)
Dedupe/batch reminders that would otherwise repeat
Impact: In one session, context usage was ~15% per user message during a simple test logging workflow, primarily due to repeated system reminder processing.

Alternative Solutions

_No response_

Priority

High - Significant impact on productivity

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

_No response_