v5.14.3

• (enhancement) improved --auto-calibrate with lightweight semantic response diffing for soft-404 detection
• (enhancement) added visible-text, semantic phrase, semantic term, DOM-token and text-density calibration signals
• (enhancement) improved dynamic body normalization for emails, path-like fragments and long encoded tokens
• (enhancement) semantic calibration remains opt-in through the existing --auto-calibrate flow and does not change default scan behaviour
• (tests) added regression coverage for semantic soft-404 matching and calibration helper edge cases
• (tests) full unittest suite passes after integration
• (tests) coverage gate passes at 99%