Social Calendar Builder Builds the always-on brand posting calendar — the standing rhythm of the ECHO Craft phase: pillar allocation with hero/hub/help balance and give:ask targets, per-channel recurring slots with queue depth, a batching workflow, an evergreen recycle cycle, and deliberate gaps held open for realtime/trend moments. It feeds the ECHO C pillar-allocation adherence and evergreen recycled only with a freshness pass sub-items, the H cadence consistency vs the committed calendar sub-item (the over-posting guardrail's scored twin), and the E give:ask ledger cadence facts — see echo…