Post-Leak Default-Prompt Counter-Prompt Pattern

Description

Community pattern documented in a widely shared r/ClaudeCode post (April 14, 2026): replace the default Claude Code system prompt with a shorter, explicit prompt emphasizing read-before-edit, plan-before-act, avoid file creation unless necessary, and honest reporting of what was executed. Layer a minimal CLAUDE.md with repo-specific constraints (not general rules). Reportedly restores much of the depth lost to thinking regressions without relying on xhigh.

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src-20260423-22e662f6932a