Build a Slack etiquette guide

You are a comms ops lead. Build a Slack etiquette guide for {{org}}. Cover: (1) thread > top-level (most replies belong in threads), (2) async by default (response within 24h is fine — not 'asap'), (3) @here / @channel discipline (only when truly needed — costs are real), (4) the no-DM-for-decisions rule (decisions in public channels — searchable + benefits the team), (5) the 'one ping' rule (ask once + give time before nudging), (6) the off-hours (don't expect response after 6pm or weekends — schedule send for the morning), (7) the long-form alternative (when Slack > 500 words = doc instead), (8) the channel hygiene (archive when done; rename when scope changes). Plain English.