Update README.md

README.md

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-# Carmignac — Data Repair Pipeline
+## Carmignac — Data Repair Pipeline
 
 Registrar Account ID repair for AUM and Flows data.  
 Carmignac × ENSAE Data Challenge 2025.
 
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-## Problem
+### Problem
 
 AUM and Flows tables must satisfy the stock-flow identity for every `(account, ISIN, month)`:
 
@@ -17,7 +17,7 @@ In practice this identity is violated because Registrar Account IDs change over
 
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-## Files
+### Files
 
 | File | Role |
 |------|------|
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-## Usage
+### Usage
 
 Run in order:
 
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-## Outputs
+### Outputs
 
 | File | Content |
 |------|---------|
@@ -75,7 +75,7 @@ python carmignac_analysis.py \
 
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-## Key parameters
+### Key parameters
 
 | Parameter | Value | Role |
 |-----------|-------|------|