Creates or replaces the caller's organization knowledge file — a single free-form text/markdown blob describing the org (who they are, what workflows they run, their goals). Idempotent full replacement: content becomes the entire file. Read it back with GET /api/v1/user/knowledge.

Max size: 256 KB (UTF-8). To clear the file, send an empty string.

{
  "content": "# Floqer\n\nGTM automation platform. Our team runs enrichment + outreach workflows: enrich inbound signups, find work emails via waterfall, and sync qualified leads to HubSpot. Goal: cut manual research time and keep the CRM enriched."
}