qr_code_batches + qr_codes tables. State machine via
spatie/laravel-model-states (unassigned → allocated → active → used,
plus expired/voided). Serial format PH-{area}-{YYMM}-{batch}-{code}-
{checksum} with 2-char SHA-256-derived checksum. BatchGenerator
bulk-inserts in chunks. QrAllocator allocates free codes to verified
households (prefers area-targeted batch, falls back to any). Real
HouseholdVerified listener replaces the placeholder. QrBalanceLow
event for Module 11.
Admin: batch CRUD, mark-printed, void code, lifecycle search, PDF
print sheet (24/A4 via dompdf + endroid/qr-code + picqer/barcode).
Resident: list own codes, balance with low_balance flag, activate
allocated codes.
Removed explicit Event::listen for HouseholdVerified — Laravel 11
auto-discovers it via handle() type-hint, and double-registering was
causing double-dispatch.
130 feature tests passing.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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