fix(stats): correct lessons count — 1,100+ (actual 1,128), not 1,200+

Git-Session-Id: c6a2c38f-ace9-49e3-abfd-b09488fa10bd

Author: TimeToBuildBob

_data/stats.yml

@@ -4,7 +4,7 @@
 
 sessions: "29,300+"
 prs_merged: "5,700+"
-lessons: "1,200+"
+lessons: "1,100+"
 
 # Absolute dates — months are computed at build time (Liquid) and client-side (JS)
 # Do NOT store relative values like "5+ months" here — they drift.