Clean production code: -O2, read CRC32 from ExtRAM, remove all debug

.trellis/spec/frontend/hook-guidelines.md

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+# Hook Guidelines
+
+> How hooks are used in this project.
+
+---
+
+## Overview
+
+<!--
+Document your project's hook conventions here.
+
+Questions to answer:
+- What custom hooks do you have?
+- How do you handle data fetching?
+- What are the naming conventions?
+- How do you share stateful logic?
+-->
+
+(To be filled by the team)
+
+---
+
+## Custom Hook Patterns
+
+<!-- How to create and structure custom hooks -->
+
+(To be filled by the team)
+
+---
+
+## Data Fetching
+
+<!-- How data fetching is handled (React Query, SWR, etc.) -->
+
+(To be filled by the team)
+
+---
+
+## Naming Conventions
+
+<!-- Hook naming rules (use*, etc.) -->
+
+(To be filled by the team)
+
+---
+
+## Common Mistakes
+
+<!-- Hook-related mistakes your team has made -->
+
+(To be filled by the team)