- V-B06 enum validation: the five VALID_* sets
(VALID_BRAND_CATEGORIES, VALID_VALUE_TRAJECTORIES, VALID_SCARCITY_CLASSES,
VALID_BRAND_TIERS, VALID_CURRENCY_DENOMINATIONS) were defined but never
referenced. brand_products.brand_category etc. are plain TEXT with no
CHECK constraints, so a typo like `brand_category = "terrior"` silently
imported. `validate_brands` now runs a V-B06 pass that asserts every
enum column is a member of its VALID_* set. V-B01..V-B05 + V-B06 all
reported together on import failure.
- Explicit transaction wrapper: the clear-then-reimport cycle (10 DELETEs
followed by 9 imports and structural validation) used to depend on
Python's implicit-deferred-transaction semantics and sys.exit() on
validation failure. A crash mid-import could leave the DB with some
tables empty and others intact. The body now runs inside
`conn.execute("BEGIN")` + try/except with an explicit `_ImportAborted`
for validation failures and a `BaseException` catch-all for
KeyboardInterrupt / programmer errors. All failure paths rollback
before exit; the commit only fires after structural validation
passes. Dry-run leaves the transaction open so the coverage check
below can still SELECT against in-memory state.
- system_fiscal docstring: previously cited the D-189 §6 derived
formula (`collection_efficiency = 1.0 - shadow_economy_intensity × 0.6`)
while the implementation hardcodes `collection_efficiency = 0.85` for
every system. The docstring now explicitly states these are Phase 2
placeholder values (with named constants PHASE2_CORP_TAX_RATE and
PHASE2_COLLECTION_EFFICIENCY) and calls out the shadow_economy.toml
pipeline as the Phase 3 follow-up.