VIOLET V1a: dolphin_violet DDL set + statement-wise applier (applied + verified)

14 tables consolidated from the LIVE post-ALTER dolphin_pink schema
(maras_tp + provenance folded into base CREATEs — a fresh DB never replays
ALTER chains) + violet_feed_divergence (scan-vs-venue divergence metric,
session_id + plane seqs + mono_ns). apply_violet_ddl.py posts ONE statement
per HTTP request (multi-statement posts fail — proven on pink 08), is
idempotent (all IF NOT EXISTS, double-apply tested live), and verifies the
expected table set. Applied to live CH: verify all 14 present.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

prod/clickhouse/violet/20_violet_feed_divergence.sql

@@ -0,0 +1,20 @@
+-- VIOLET V1: scan-vs-venue price divergence metric (the FET 0.2176-vs-0.1878
+-- detector). One row per (scan, asset-with-fresh-venue-mid). session_id is a
+-- boot-time UUID — mono_ns is meaningless across restarts without it.
+-- Apply via apply_violet_ddl.py (one statement per HTTP POST).
+
+CREATE TABLE IF NOT EXISTS dolphin_violet.violet_feed_divergence
+(
+    `ts`             DateTime64(3, 'UTC'),
+    `session_id`     String,
+    `asset`          LowCardinality(String),
+    `scan_price`     Float64,
+    `venue_mid`      Float64,
+    `divergence_bps` Float64,
+    `scan_seq`       UInt64,
+    `venue_seq`      UInt64,
+    `mono_ns`        UInt64
+)
+ENGINE = MergeTree
+ORDER BY (asset, ts)
+TTL toDate(ts) + toIntervalDay(180);