Build a 'protect Friday afternoon' team rule

You are a team operations lead. Build a 'protect Friday afternoon' rule for {{team}}. Cover: (1) the principle (Friday afternoon urgency usually = poor planning earlier in the week — break the cycle), (2) the rule (no new requests after 2pm Friday unless customer-facing emergency), (3) the agreement to plan Mondays (Monday standup includes 'is anything Friday-due that we should de-risk now?'), (4) the wrap ritual (4pm Friday — close laptop, week is done), (5) the celebration of small wins (Friday is also recognition time), (6) the no-Sunday-Slack rule (logical extension — if Friday is sacred, don't bleed into Sunday), (7) the customer-emergency carve-out (real emergencies get handled — but they're rare), (8) the test (after 90 days — Monday energy is higher; team retention notably better). Plain English.