Humanize READMEs and guides for clearer, professional tone

Align with project-template docs/writing-docs.md: plain openings, no
emoji decoration, archive scratch plans where they cluttered live docs.

docs/06_free_testing_data.md

@@ -6,7 +6,7 @@ Great question! Here are multiple strategies for testing the full pipeline **wit
 
 ---
 
-## Strategy 1: Mock/Fixture Data (Current Approach ✅)
+## Strategy 1: Mock/Fixture Data (Current Approach )
 
 **What we already have:**
 - `tests/conftest.py` creates in-memory SQLite DB with sample officials, securities, trades
@@ -99,7 +99,7 @@ def test_etl_with_real_data():
 
 ---
 
-## Strategy 4: Hybrid Testing (Recommended 🌟)
+## Strategy 4: Hybrid Testing (Recommended )
 
 **Combine all strategies**:
 
@@ -164,7 +164,7 @@ def test_etl_with_real_data():
 
 | Source | Free Tier | Paid Tier | Best For |
 |--------|-----------|-----------|----------|
-| **yfinance** | Unlimited | N/A | Prices (already working ✅) |
+| **yfinance** | Unlimited | N/A | Prices (already working ) |
 | **House Stock Watcher** | Unlimited scraping | N/A | Free trades (best option) |
 | **Quiver Free** | 500 calls/mo | $30/mo (5k calls) | Testing, not production |
 | **FMP Free** | 250 calls/day | $15/mo | Alternative for trades |
@@ -222,5 +222,5 @@ class HouseWatcherClient:
         }
 ```
 
-Let me know if you want me to implement this scraper now for PR2! 🚀
+Let me know if you want me to implement this scraper now for PR2!