10 endpoints in shopfloor_controller (log_chemistry, start_bake, end_bake,
start_wo, stop_wo, bump_qty_done, bump_qty_scrapped, log_thickness_reading,
quality_hold, mark_gate) and 3 in manager_controller (assign_worker,
assign_tank, take_over) now accept a `tablet_tech_id` kwarg. Each rebinds
env via env_for_tablet_tech() so writes carry the correct uid even when
the OS session belongs to the persistent tablet user.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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