Audit items #15, #16, #20, #22.
#15 — AuthController::me and UserResource form/table now read tier via
PlanFeatures::for($user)->tier() instead of Plan::resolveForUser($user)
->name. Tiers.md: PlanFeatures is the single entitlement gate.
#16 — Moved SQLite GREATEST/LEAST PHP-backed function registration from
AppServiceProvider::boot to tests/TestCase::setUp. Production app boot no
longer checks the DB driver name.
#20 — FetchOilPrices: added Log::warning on EIA fallback and Log::error
on both-providers-failed so primary-source reliability can be trended
beyond the cron output buffer.
#22 — FuelPriceService::flattenEnabledFlags is now an instance method,
matching the rest of the class. No external callers.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
