Remove the text overlay on the hero portrait

Details

The portrait carried a glass tag ("AI Researcher · NeuroSymbolic · LLMs ·
Robotics") across the lower third of the photo (over the face). The hero
title, lede, and proof bar already convey all of that, so drop the overlay and
let the headshot stand clean. Removes the markup, the now-dead .v3-portrait-tag
CSS, and its no-backdrop-filter fallback reference.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HShRpQUmDUttxD5F89ziDu

Files changed (3)