fix: require digit after Table/Figure prefix in caption detection

Caption detection was incorrectly classifying "Table of Contents" as a
caption because it starts with "Table ". Now "Table" and "Figure"
prefixes require a digit, parenthesis, or hash after them — matching
actual captions like "Table 1", "Figure 3.2" but not titles.

Also removes debug logging left from previous iteration.

Benchmark improvement: MHS 0.52→0.54, overall 0.757→0.761.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/snapshots/real-estate-pricing.md

@@ -6,7 +6,7 @@
 
 8 4 Z E L L / L U R I E R E A L E S T A T E C E N T E R
 
-**Table I: Cap rate correlations**
+## Table I: Cap rate correlations
 
 ## Cap Rate Correlation With:*
 
@@ -38,7 +38,7 @@ R E V I E W 8 5
 
 1982 1986 1990 1994 1998 2002 2006
 
-**Table II: Correlationsofspreadsbypropertytype**
+## Table II: Correlationsofspreadsbypropertytype
 
 ## Correlation of Cap Rate Spreads Over Treasury