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Sequel to the 2026-05-22 tablet redesign (Phases 1-5). Adds a tile-grid lock screen + 4-digit PIN per tech + 5-min auto-lock + audit propagation so multiple techs sharing one tablet get correctly-attributed actions. Key design choices: - 4-digit PIN (industry norm), PBKDF2-SHA256 with 200k iterations - Per-user lockout after 5 failures (not per-tablet) - Single Odoo session + tablet_tech_id kwarg for audit (no JS reload on every tech switch) - Manager-side reset only (no SMS/email infra) - Server-side step timer keeps running on lock (auto-pause cron is the upper-bound safety net) Three sub-phases (6.1 backend / 6.2 frontend lock / 6.3 audit kwarg propagation), each independently deployable. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>