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

.trellis/spec/backend/error-handling.md

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+# Error Handling
+
+> How errors are handled in this project.
+
+---
+
+## Overview
+
+<!--
+Document your project's error handling conventions here.
+
+Questions to answer:
+- What error types do you define?
+- How are errors propagated?
+- How are errors logged?
+- How are errors returned to clients?
+-->
+
+(To be filled by the team)
+
+---
+
+## Error Types
+
+<!-- Custom error classes/types -->
+
+(To be filled by the team)
+
+---
+
+## Error Handling Patterns
+
+<!-- Try-catch patterns, error propagation -->
+
+(To be filled by the team)
+
+---
+
+## API Error Responses
+
+<!-- Standard error response format -->
+
+(To be filled by the team)
+
+---
+
+## Common Mistakes
+
+<!-- Error handling mistakes your team has made -->
+
+(To be filled by the team)