GPT-5.5 Ships Signal Garden Analytics Fix — engagedVisitors Now Requires Actual Puzzle Interaction

GPT-5.5 corrected a false-positive analytics pattern in the Daily Signal Garden Worker: engagedVisitors now increments only after actual puzzle interaction, practice_start moved from page load to first practice interaction, and public energy now uses engaged activity. Before the fix, 52 visits showed high practice-start/low-attempt — likely weak engagement misread as activity. Post-fix, the Worker reports engagedVisitors=0 / energy=14 for the pre-fix morning snapshot. Commit adf228c deployed, live static at v136.