diff --git a/app/tests/Feature/Imitation/ScenarioD_DeliveryDaysTest.php b/app/tests/Feature/Imitation/ScenarioD_DeliveryDaysTest.php
new file mode 100644
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+++ b/app/tests/Feature/Imitation/ScenarioD_DeliveryDaysTest.php
@@ -0,0 +1,265 @@
+<?php
+
+declare(strict_types=1);
+
+use App\Models\Deal;
+use App\Models\Project;
+use App\Models\SupplierProject;
+use App\Models\Tenant;
+use App\Services\DaData\DaDataPhoneClient;
+use App\Services\LeadRouter;
+use Carbon\Carbon;
+use Database\Seeders\PricingTierSeeder;
+use Illuminate\Foundation\Testing\DatabaseTransactions;
+use Illuminate\Support\Facades\DB;
+use Random\Engine\Mt19937;
+use Random\Randomizer;
+use Tests\Concerns\SharesSupplierPdo;
+use Tests\Support\Imitation\ConditionLevers;
+use Tests\Support\Imitation\FakeDaDataPhoneClient;
+use Tests\Support\Imitation\LeadInjector;
+use Tests\Support\Imitation\SnapshotForge;
+
+uses(DatabaseTransactions::class, SharesSupplierPdo::class);
+
+/**
+ * Scenario D — delivery_days_mask filter verification.
+ *
+ * VERIFICATION test against existing production routing code.
+ * Proves (or disproves) that the delivery_days_mask filter correctly excludes
+ * projects from the snapshot when today's weekday bit is NOT set.
+ * NOT TDD — no prod code is modified.  Differences vs plan → FINDINGS.
+ *
+ * Weekday-bit convention (confirmed from SnapshotProjectRoutingJob + SnapshotRebuildCommand):
+ *   weekdayBit = 1 << (date->isoWeekday() - 1)
+ *   isoWeekday(): Monday=1, Tuesday=2, ..., Sunday=7
+ *   → Monday  = 1<<0 = 1
+ *   → Tuesday = 1<<1 = 2
+ *   → ...
+ *   → Sunday  = 1<<6 = 64
+ *   → Full week mask = 127  (bits 0-6 all set)
+ *
+ * SnapshotForge::activeDate() mirrors LeadRouter::activeSnapshotDate():
+ *   - Before 21:00 MSK → today's date
+ *   - From  21:00 MSK → tomorrow's date
+ * snapshot:rebuild filters by that date's isoWeekday bit.
+ *
+ * Setup:
+ *   - One shared SupplierProject (B1 site signal).
+ *   - Two tenants / projects on that supplier.
+ *   - ACTIVE client:   delivery_days_mask = 127 (all days — includes any day).
+ *   - INACTIVE client: delivery_days_mask = full-week MINUS today's bit (excludes active date).
+ *   - Both tenants have ample balance and no freeze.
+ *   - SnapshotForge::rebuild() called AFTER masks are set.
+ *   - One lead injected.
+ *
+ * Expected (per plan §6.2 D):
+ *   - ACTIVE client receives the deal.
+ *   - INACTIVE client receives ZERO deals (not in snapshot → invisible to LeadRouter).
+ *
+ * Subject code: Москва = 82 (порядковый, НЕ ГИБДД).
+ *
+ * Task 8 — Phase 1 Portal Client Imitation, Scenario D.
+ * Spec: docs/superpowers/specs/2026-06-03-portal-client-imitation-phase1-design.md §6.2 D
+ * Plan: docs/superpowers/plans/2026-06-03-portal-client-imitation-phase1.md §Task 8
+ */
+
+// ── SUBJECT CODE ──────────────────────────────────────────────────────────────
+/** App\Support\RussianRegions::CODE_TO_NAME[82] = 'Москва' */
+const D_MOSCOW_CODE = 82;
+
+// ── SUPPLIER SIGNAL ───────────────────────────────────────────────────────────
+const D_SUPPLIER_DOMAIN   = 'scenario-d-delivery-days.ru';
+const D_SUPPLIER_PLATFORM = 'B1';
+
+// ── DETERMINISTIC SEED ────────────────────────────────────────────────────────
+const D_SEED = 19;
+
+// ── PHONE NUMBERS ─────────────────────────────────────────────────────────────
+/** Phone resolving to Москва via FakeDaDataPhoneClient. */
+const D_PHONE_1 = '79270000099';
+
+beforeEach(function (): void {
+    // Pricing tiers — required by LedgerService::chargeForDelivery.
+    $this->seed(PricingTierSeeder::class);
+
+    // Global RLS bypass for seeding phase (tenant context = 0).
+    DB::statement("SELECT set_config('app.current_tenant_id', '0', true)");
+
+    // DaData config — FakeDaDataPhoneClient bypasses HTTP entirely.
+    config([
+        'services.dadata.enabled'      => true,
+        'services.dadata.api_key'      => 'fake-key',
+        'services.dadata.secret'       => 'fake-secret',
+        'services.dadata.daily_cap_rub' => 1_000_000,
+    ]);
+
+    // Bind deterministic LeadRouter (small cap — only 2 projects, so no real lottery needed,
+    // but we seed for reproducibility).
+    app()->instance(LeadRouter::class, new LeadRouter(new Randomizer(new Mt19937(D_SEED))));
+});
+
+it('only delivers to the active-today client; the excluded-day client gets zero deals', function (): void {
+    // ── DETERMINE ACTIVE DATE AND ITS WEEKDAY BIT ────────────────────────────
+    //
+    // SnapshotForge::activeDate() mirrors LeadRouter::activeSnapshotDate().
+    // SnapshotRebuildCommand: weekdayBit = 1 << (date->isoWeekday() - 1).
+    // isoWeekday(): Monday=1 .. Sunday=7.
+    //
+    // We MUST compute the bit from the active-snapshot date (not wall-clock today),
+    // because after 21:00 MSK the active date flips to tomorrow.
+    $activeDate   = SnapshotForge::activeDate();                        // 'YYYY-MM-DD'
+    $activeDateObj = Carbon::parse($activeDate, 'Europe/Moscow');
+    $todayBit      = 1 << ($activeDateObj->isoWeekday() - 1);          // e.g. Wednesday=4
+
+    // ACTIVE mask: full week (includes every day, including today).
+    $activeMask = 127;  // 0b1111111
+
+    // INACTIVE mask: full week MINUS today's bit → excludes the active snapshot date.
+    // snapshot:rebuild WHERE (delivery_days_mask & weekdayBit) <> 0 will skip this project.
+    $inactiveMask = 127 & ~$todayBit;  // clears the bit for the active date's weekday
+
+    // Sanity: active mask passes the filter, inactive mask does not.
+    expect(($activeMask   & $todayBit) !== 0)->toBeTrue();
+    expect(($inactiveMask & $todayBit))->toBe(0);
+
+    // ── ARRANGE: SHARED SUPPLIER PROJECT ─────────────────────────────────────
+    $supplier = SupplierProject::factory()->create([
+        'platform'    => D_SUPPLIER_PLATFORM,
+        'signal_type' => 'site',
+        'unique_key'  => D_SUPPLIER_DOMAIN,
+    ]);
+
+    // ── ARRANGE: ACTIVE TENANT / PROJECT ─────────────────────────────────────
+    $tenantActive = Tenant::factory()->create([
+        'balance_rub'          => '9999.00',
+        'frozen_by_balance_at' => null,
+    ]);
+
+    $projectActive = Project::factory()->create([
+        'tenant_id'                   => $tenantActive->id,
+        'is_active'                   => true,
+        'signal_type'                 => 'site',
+        'signal_identifier'           => D_SUPPLIER_DOMAIN,
+        'daily_limit_target'          => 10,
+        'effective_daily_limit_today' => null,
+        'delivered_today'             => 0,
+        'delivered_in_month'          => 0,
+        'delivery_days_mask'          => $activeMask,    // all days — included today
+        'preflight_blocked_at'        => null,
+        'regions'                     => [D_MOSCOW_CODE],
+    ]);
+
+    linkProjectToSupplier($projectActive, $supplier);
+
+    // ── ARRANGE: INACTIVE TENANT / PROJECT ───────────────────────────────────
+    $tenantInactive = Tenant::factory()->create([
+        'balance_rub'          => '9999.00',
+        'frozen_by_balance_at' => null,
+    ]);
+
+    $projectInactive = Project::factory()->create([
+        'tenant_id'                   => $tenantInactive->id,
+        'is_active'                   => true,
+        'signal_type'                 => 'site',
+        'signal_identifier'           => D_SUPPLIER_DOMAIN,
+        'daily_limit_target'          => 10,
+        'effective_daily_limit_today' => null,
+        'delivered_today'             => 0,
+        'delivered_in_month'          => 0,
+        'delivery_days_mask'          => $inactiveMask, // today's bit cleared — excluded from snapshot
+        'preflight_blocked_at'        => null,
+        'regions'                     => [D_MOSCOW_CODE],
+    ]);
+
+    linkProjectToSupplier($projectInactive, $supplier);
+
+    // ── REBUILD SNAPSHOT AFTER MASKS ARE SET ─────────────────────────────────
+    // SnapshotRebuildCommand: WHERE (delivery_days_mask & weekdayBit) <> 0
+    // → projectActive  IS inserted (bit set)
+    // → projectInactive NOT inserted (bit cleared)
+    SnapshotForge::rebuild();
+
+    // Verify snapshot state directly: active project is in snapshot, inactive is not.
+    $snapshotActiveExists = DB::connection('pgsql_supplier')
+        ->table('project_routing_snapshots')
+        ->where('snapshot_date', $activeDate)
+        ->where('project_id', $projectActive->id)
+        ->exists();
+
+    $snapshotInactiveExists = DB::connection('pgsql_supplier')
+        ->table('project_routing_snapshots')
+        ->where('snapshot_date', $activeDate)
+        ->where('project_id', $projectInactive->id)
+        ->exists();
+
+    expect($snapshotActiveExists)->toBeTrue(
+        "FINDING: projectActive (mask={$activeMask}, bit={$todayBit}) " .
+        "was expected in the snapshot for {$activeDate} but is absent. " .
+        "SnapshotRebuildCommand may have a bug in delivery_days_mask filtering."
+    );
+
+    expect($snapshotInactiveExists)->toBeFalse(
+        "FINDING: projectInactive (mask={$inactiveMask}, bit={$todayBit}) " .
+        "was expected to be ABSENT from the snapshot for {$activeDate} but was INSERTED. " .
+        "This means the delivery_days_mask filter is not working — the inactive project " .
+        "will receive leads it should not receive."
+    );
+
+    // ── ARRANGE: FAKE DADATA CLIENT ──────────────────────────────────────────
+    $fake = (new FakeDaDataPhoneClient())->stub(D_PHONE_1, qc: 0, region: 'Москва', provider: 'МТС');
+    app()->instance(DaDataPhoneClient::class, $fake);
+
+    // ── ACT: INJECT ONE LEAD ─────────────────────────────────────────────────
+    (new LeadInjector())->site(
+        domain:   D_SUPPLIER_DOMAIN,
+        phone:    D_PHONE_1,
+        tag:      'Москва',
+        platform: D_SUPPLIER_PLATFORM,
+        vid:      88_000_000_001,
+    );
+
+    // ── ASSERT: DEALS DISTRIBUTION ───────────────────────────────────────────
+
+    // Active client MUST receive exactly 1 deal.
+    $activeDeals = DB::connection('pgsql_supplier')
+        ->table('deals')
+        ->where('tenant_id', $tenantActive->id)
+        ->count();
+
+    // Inactive client MUST receive 0 deals (not in snapshot).
+    $inactiveDeals = DB::connection('pgsql_supplier')
+        ->table('deals')
+        ->where('tenant_id', $tenantInactive->id)
+        ->count();
+
+    // Diagnostic output.
+    fwrite(STDOUT, PHP_EOL . '=== SCENARIO D: DELIVERY DAYS FILTER REPORT ===' . PHP_EOL);
+    fwrite(STDOUT, sprintf('Active date:      %s (isoWeekday=%d)%s',
+        $activeDate, $activeDateObj->isoWeekday(), PHP_EOL));
+    fwrite(STDOUT, sprintf('Today bit:        %d (0b%s)%s',
+        $todayBit, str_pad(decbin($todayBit), 7, '0', STR_PAD_LEFT), PHP_EOL));
+    fwrite(STDOUT, sprintf('Active mask:      %d (0b%s) → snapshot: %s%s',
+        $activeMask, str_pad(decbin($activeMask), 7, '0', STR_PAD_LEFT),
+        $snapshotActiveExists ? 'INCLUDED' : 'MISSING', PHP_EOL));
+    fwrite(STDOUT, sprintf('Inactive mask:    %d (0b%s) → snapshot: %s%s',
+        $inactiveMask, str_pad(decbin($inactiveMask), 7, '0', STR_PAD_LEFT),
+        $snapshotInactiveExists ? 'PRESENT (BUG!)' : 'ABSENT (correct)', PHP_EOL));
+    fwrite(STDOUT, sprintf('Active client deals:   %d (expected: 1)%s', $activeDeals, PHP_EOL));
+    fwrite(STDOUT, sprintf('Inactive client deals: %d (expected: 0)%s', $inactiveDeals, PHP_EOL));
+    fwrite(STDOUT, '=== END SCENARIO D ===' . PHP_EOL . PHP_EOL);
+
+    expect($activeDeals)->toBe(1,
+        "FINDING: Active client (mask={$activeMask}, project_id={$projectActive->id}) " .
+        "expected 1 deal but got {$activeDeals}. " .
+        "Check LeadRouter eligibility query or LedgerService::chargeForDelivery."
+    );
+
+    expect($inactiveDeals)->toBe(0,
+        "FINDING: Inactive client (mask={$inactiveMask}, today_bit={$todayBit}, " .
+        "project_id={$projectInactive->id}) expected 0 deals but got {$inactiveDeals}. " .
+        "The delivery_days_mask filter in SnapshotRebuildCommand is NOT excluding this project. " .
+        "This is a correctness bug: clients with today's bit cleared MUST be absent from the snapshot."
+    );
+
+})->group('imitation');