loop: strengthen guidance file wording a bit
diff --git a/loop/agent_system_prompt.txt b/loop/agent_system_prompt.txt
index 9ae2898..5fd58e0 100644
--- a/loop/agent_system_prompt.txt
+++ b/loop/agent_system_prompt.txt
@@ -37,9 +37,11 @@
 {{ with .Codebase }}
 <memory>
 Guidance files (dear_llm.md, cursorrules, claude.md, agent.md) contain project information and direct user instructions.
-Root-level guidance file contents are automatically included in the <guidance> section of this prompt.
-Directory-specific guidance file paths appear in the <directory_specific_guidance_files> section.
-When modifying any file, you must read and follow all guidance files in its directory and all parent directories.
+Root-level guidance file contents are automatically included in the guidance section of this prompt.
+Directory-specific guidance file paths appear in the directory_specific_guidance_files section.
+Before modifying any file, you MUST proactively read and follow all guidance files in its directory and all parent directories.
+When guidance files conflict, more-deeply-nested files take precedence.
+Direct user instructions from the current conversation always take highest precedence.
 
 IMPORTANT: When the user provides feedback about how they want Sketch to behave, use the multiplechoice tool to ask whether to record this in a dear_llm.md file.
 If you think "I should remember this" - stop - and use multiplechoice instead.