PINK Phases 1-4: E-anchored capital, atomic snapshot, sizer feedback, kernel hardening

Phase 1: account.py anchor_to_exchange, capital_source provenance, settle
includes fees in capital delta.
Phase 2: atomic snapshot swap, CH provenance DDL (08_provenance.sql),
naive-UTC timestamps, ch_writer wait_for_async_insert=1 for all tables,
head-of-line stuck-row logging at WARNING per 100 attempts.
Phase 3: sizer feedback uses slot realized_pnl (not capital delta),
FILL_SETTLED repairs slot-level PnL for price-less exit legs.
Phase 4: resolve_slot returns Option<usize>, UNRESOLVED_SLOT diagnostic.
bars_held clamped to max(0, ...) at row-build time.

prod/clickhouse/pink/08_provenance.sql

@@ -0,0 +1,17 @@
+-- Phase 2: provenance columns (E-anchored capital, PnL source)
+-- Apply BEFORE deploying code that emits these fields.
+-- ALTER TABLE ... ADD COLUMN IF NOT EXISTS is idempotent.
+
+ALTER TABLE dolphin_pink.account_events
+    ADD COLUMN IF NOT EXISTS `capital_source` LowCardinality(String) DEFAULT '',
+    ADD COLUMN IF NOT EXISTS `account_event_seq` UInt64 DEFAULT 0;
+
+ALTER TABLE dolphin_pink.status_snapshots
+    ADD COLUMN IF NOT EXISTS `capital_source` LowCardinality(String) DEFAULT '',
+    ADD COLUMN IF NOT EXISTS `account_event_seq` UInt64 DEFAULT 0;
+
+ALTER TABLE dolphin_pink.trade_events
+    ADD COLUMN IF NOT EXISTS `pnl_source` LowCardinality(String) DEFAULT '';
+
+ALTER TABLE dolphin_pink.trade_exit_legs
+    ADD COLUMN IF NOT EXISTS `pnl_source` LowCardinality(String) DEFAULT '';