chore: say what the measurement opt-in does for Codex

The plan said the opt-in distinguishes the result by tool, which is the
report's job. The opt-in turns the measurement on, after consent, for the
work done with Claude Code and with Codex.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019tw8HkVy69fuukqR971Roz

Author: blafourcade

aidd_docs/release-video/scenes.json

@@ -362,7 +362,7 @@
       {
         "surface": "aidd-telemetry:00-init",
         "theme": "Télémétrie",
-        "text": "activer la mesure et distinguer le résultat par outil, Claude Code ou Codex."
+        "text": "activer la mesure, avec votre accord, du travail fait avec Claude Code et Codex."
       },
       {
         "surface": "aidd-dev:01-plan",