VIOLET V3.4b/V3e: journal the full-sizing breakdown (DDL + row guard)

ShadowDecision already carries the V3.4 5-factor breakdown (base_leverage,
dc_lev_mult, regime_size_mult, market_ob_mult, esof_size_mult), but the journal
row and CH DDL dropped it — so a DARK soak would record decisions WITHOUT the
factor decomposition that V3.4 exists to expose. Thread it through:

- 22_violet_decisions.sql: 5 additive Nullable(Float64) breakdown columns. NULL
  on the legacy base-only path; populated once the launcher feeds live factor
  planes. Note added: on a pre-existing table use ALTER ... ADD COLUMN instead of
  the CREATE IF NOT EXISTS (no live table yet — VIOLET is DARK, never soaked).
- shadow_journal.py: DecisionRow gains the 5 Optional[float] fields (ge=0.0,
  finite-guarded); journal() populates them via getattr(..., None) so the
  base-only path and duck-typed reject tests stay NULL/rejected rather than
  raising on attribute access.
- test_violet_shadow_journal.py: breakdown round-trips on the full path; NULL on
  base-only; a negative multiplier is rejected at the row guard. The existing
  DecisionRow-fields == DDL-columns parity test still holds with the new columns.

violet-only; no shared-file edits; no soak. 29 violet tests green
(7 journal + 22 engine/DDL-apply).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

prod/clickhouse/violet/22_violet_decisions.sql

@@ -19,7 +19,16 @@ CREATE TABLE IF NOT EXISTS dolphin_violet.violet_decisions
     `target_exposure`     Float64,
     `ars_score`           Float64,
     `bucket_idx`          UInt8,
-    `actuated`            UInt8
+    `actuated`            UInt8,
+    -- V3.4 full-sizing breakdown: conviction = base × dc × regime(ACB) × ob × esof,
+    -- capped @9. NULL on the legacy base-only path (no live SizingFactors); populated
+    -- when the launcher feeds live factor planes. Additive columns — on a pre-existing
+    -- table apply the matching `ALTER TABLE ... ADD COLUMN IF NOT EXISTS` instead.
+    `base_leverage`       Nullable(Float64),
+    `dc_lev_mult`         Nullable(Float64),
+    `regime_size_mult`    Nullable(Float64),
+    `market_ob_mult`      Nullable(Float64),
+    `esof_size_mult`      Nullable(Float64)
 )
 ENGINE = MergeTree
 ORDER BY (asset, ts)