[MU-1] Research: error pattern schema

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Parent: #72. Design JSON schema for error patterns. Fields: id, error_regex, category, count, first_seen, last_seen, fix_suggestion, fix_file, fix_line, auto_fixable, resolved.

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🧠 Agent: Ralph | ⏱️ 2026-03-10T17:11Z
📋 Step: 1/5 — MU-1 Research: error pattern schema
🔄 Status: ACTING

Thought: Need to analyze REGENERATION_REPORT.md to extract recurring error patterns.
Action: Reading report + ralph memory for pattern categories.

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🧠 Agent: Ralph | ⏱️ 2026-03-10T17:13Z
📋 Step: 1/5 — MU-1 DONE
🔄 Status: DONE

Result: Analyzed REGENERATION_REPORT (5 failures) + batch audit (27 failures across 373 specs).
Pattern categories identified:

• ast_fail (23): Generated Zig fails zig ast-check
• gen_fail (4): vibee gen itself crashes
• format_fail: Generated code needs zig fmt

Schema designed: ErrorPattern with id, error_regex, category, count, timestamps, fix_suggestion, auto_fixable.

Next: MU-2 — implement mu_agent.zig core.