feat(Production): Complete production deployment infrastructure

- Add comprehensive health check system with multiple endpoints
- Add Prometheus metrics endpoint
- Add production logging configurations (5 strategies)
- Add complete deployment documentation suite:
  * QUICKSTART.md - 30-minute deployment guide
  * DEPLOYMENT_CHECKLIST.md - Printable verification checklist
  * DEPLOYMENT_WORKFLOW.md - Complete deployment lifecycle
  * PRODUCTION_DEPLOYMENT.md - Comprehensive technical reference
  * production-logging.md - Logging configuration guide
  * ANSIBLE_DEPLOYMENT.md - Infrastructure as Code automation
  * README.md - Navigation hub
  * DEPLOYMENT_SUMMARY.md - Executive summary
- Add deployment scripts and automation
- Add DEPLOYMENT_PLAN.md - Concrete plan for immediate deployment
- Update README with production-ready features

All production infrastructure is now complete and ready for deployment.

tests/Unit/Framework/FeatureFlags/FeatureFlagManagerTest.php

@@ -0,0 +1,181 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Unit\Framework\FeatureFlags;
+
+use App\Framework\FeatureFlags\FeatureFlag;
+use App\Framework\FeatureFlags\FeatureFlagContext;
+use App\Framework\FeatureFlags\FeatureFlagManager;
+use App\Framework\FeatureFlags\FeatureFlagRepository;
+use App\Framework\FeatureFlags\FeatureFlagStatus;
+use App\Framework\Core\ValueObjects\Timestamp;
+
+describe('FeatureFlagManager', function () {
+    beforeEach(function () {
+        // Create in-memory repository for testing
+        $this->repository = new class implements FeatureFlagRepository {
+            private array $flags = [];
+
+            public function find(string $name): ?FeatureFlag
+            {
+                return $this->flags[$name] ?? null;
+            }
+
+            public function findAll(): array
+            {
+                return array_values($this->flags);
+            }
+
+            public function save(FeatureFlag $flag): void
+            {
+                $this->flags[$flag->name] = $flag;
+            }
+
+            public function delete(string $name): void
+            {
+                unset($this->flags[$name]);
+            }
+
+            public function exists(string $name): bool
+            {
+                return isset($this->flags[$name]);
+            }
+        };
+
+        $this->manager = new FeatureFlagManager($this->repository);
+    });
+
+    it('enables a feature flag', function () {
+        $this->manager->enable('test-feature', 'Test description');
+
+        expect($this->manager->isEnabled('test-feature'))->toBeTrue();
+        expect($this->manager->exists('test-feature'))->toBeTrue();
+    });
+
+    it('disables a feature flag', function () {
+        $this->manager->enable('test-feature');
+        $this->manager->disable('test-feature');
+
+        expect($this->manager->isDisabled('test-feature'))->toBeTrue();
+    });
+
+    it('returns false for non-existent flag', function () {
+        expect($this->manager->isEnabled('non-existent'))->toBeFalse();
+    });
+
+    it('sets conditional feature flag', function () {
+        $this->manager->setConditional('user-feature', ['user_id' => [1, 2, 3]]);
+
+        $matchingContext = (new FeatureFlagContext())->withUserId('2');
+        $nonMatchingContext = (new FeatureFlagContext())->withUserId('99');
+
+        expect($this->manager->isEnabled('user-feature', $matchingContext))->toBeTrue();
+        expect($this->manager->isEnabled('user-feature', $nonMatchingContext))->toBeFalse();
+    });
+
+    it('sets percentage rollout', function () {
+        $this->manager->setPercentageRollout('rollout-feature', 50);
+
+        $flag = $this->manager->getFlag('rollout-feature');
+        expect($flag)->not->toBeNull();
+        expect($flag->conditions)->toHaveKey('percentage');
+        expect($flag->conditions['percentage'])->toBe(50);
+    });
+
+    it('validates percentage range', function () {
+        expect(fn () => $this->manager->setPercentageRollout('invalid', 150))
+            ->toThrow(\InvalidArgumentException::class);
+
+        expect(fn () => $this->manager->setPercentageRollout('invalid', -10))
+            ->toThrow(\InvalidArgumentException::class);
+    });
+
+    it('sets user-specific flag', function () {
+        $this->manager->setForUsers('user-only', [1, 2, 3]);
+
+        $flag = $this->manager->getFlag('user-only');
+        expect($flag->conditions)->toHaveKey('user_id');
+        expect($flag->conditions['user_id'])->toBe([1, 2, 3]);
+    });
+
+    it('sets environment-specific flag', function () {
+        $this->manager->setForEnvironment('env-feature', 'production');
+
+        $prodContext = (new FeatureFlagContext())->withEnvironment('production');
+        $devContext = (new FeatureFlagContext())->withEnvironment('development');
+
+        expect($this->manager->isEnabled('env-feature', $prodContext))->toBeTrue();
+        expect($this->manager->isEnabled('env-feature', $devContext))->toBeFalse();
+    });
+
+    it('sets expiration', function () {
+        $this->manager->enable('temp-feature');
+
+        $expiry = Timestamp::fromTimestamp(time() + 3600);
+        $this->manager->setExpiration('temp-feature', $expiry);
+
+        $flag = $this->manager->getFlag('temp-feature');
+        expect($flag->expiresAt)->toBe($expiry);
+    });
+
+    it('throws exception when setting expiration on non-existent flag', function () {
+        $expiry = Timestamp::fromTimestamp(time() + 3600);
+
+        expect(fn () => $this->manager->setExpiration('non-existent', $expiry))
+            ->toThrow(\InvalidArgumentException::class);
+    });
+
+    it('deletes a feature flag', function () {
+        $this->manager->enable('delete-me');
+        expect($this->manager->exists('delete-me'))->toBeTrue();
+
+        $this->manager->deleteFlag('delete-me');
+        expect($this->manager->exists('delete-me'))->toBeFalse();
+    });
+
+    it('gets all feature flags', function () {
+        $this->manager->enable('flag1');
+        $this->manager->enable('flag2');
+        $this->manager->disable('flag3');
+
+        $allFlags = $this->manager->getAllFlags();
+
+        expect($allFlags)->toHaveCount(3);
+    });
+
+    it('generates status summary', function () {
+        $this->manager->enable('enabled1');
+        $this->manager->enable('enabled2');
+        $this->manager->disable('disabled1');
+        $this->manager->setConditional('conditional1', ['user_id' => [1]]);
+
+        $summary = $this->manager->getStatusSummary();
+
+        expect($summary['total'])->toBe(4);
+        expect($summary['enabled'])->toBe(2);
+        expect($summary['disabled'])->toBe(1);
+        expect($summary['conditional'])->toBe(1);
+    });
+
+    it('uses default context when none provided', function () {
+        $defaultContext = (new FeatureFlagContext())->withUserId('5');
+        $manager = new FeatureFlagManager($this->repository, $defaultContext);
+
+        $manager->setConditional('user-feature', ['user_id' => [5, 6, 7]]);
+
+        // Should use default context
+        expect($manager->isEnabled('user-feature'))->toBeTrue();
+    });
+
+    it('counts expired flags in summary', function () {
+        $this->manager->enable('expired-feature');
+
+        $pastExpiry = Timestamp::fromTimestamp(time() - 3600);
+        $this->manager->setExpiration('expired-feature', $pastExpiry);
+
+        $summary = $this->manager->getStatusSummary();
+
+        expect($summary['expired'])->toBe(1);
+    });
+});

tests/Unit/Framework/FeatureFlags/FeatureFlagTest.php

@@ -0,0 +1,150 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Unit\Framework\FeatureFlags;
+
+use App\Framework\FeatureFlags\FeatureFlag;
+use App\Framework\FeatureFlags\FeatureFlagContext;
+use App\Framework\FeatureFlags\FeatureFlagStatus;
+use App\Framework\Core\ValueObjects\Timestamp;
+
+describe('FeatureFlag', function () {
+    it('creates enabled feature flag', function () {
+        $flag = new FeatureFlag(
+            name: 'test-feature',
+            status: FeatureFlagStatus::ENABLED,
+            description: 'Test feature'
+        );
+
+        expect($flag->isEnabled())->toBeTrue();
+        expect($flag->name)->toBe('test-feature');
+        expect($flag->description)->toBe('Test feature');
+    });
+
+    it('creates disabled feature flag', function () {
+        $flag = new FeatureFlag(
+            name: 'test-feature',
+            status: FeatureFlagStatus::DISABLED
+        );
+
+        expect($flag->isEnabled())->toBeFalse();
+    });
+
+    it('checks expiration', function () {
+        $pastTime = Timestamp::fromTimestamp(time() - 3600);
+
+        $flag = new FeatureFlag(
+            name: 'expired-feature',
+            status: FeatureFlagStatus::ENABLED,
+            expiresAt: $pastTime
+        );
+
+        expect($flag->isEnabled())->toBeFalse();
+    });
+
+    it('enables flag for matching context', function () {
+        $flag = new FeatureFlag(
+            name: 'user-feature',
+            status: FeatureFlagStatus::CONDITIONAL,
+            conditions: ['user_id' => [1, 2, 3]]
+        );
+
+        $context = (new FeatureFlagContext())->withUserId('2');
+
+        expect($flag->isEnabledForContext($context))->toBeTrue();
+    });
+
+    it('disables flag for non-matching context', function () {
+        $flag = new FeatureFlag(
+            name: 'user-feature',
+            status: FeatureFlagStatus::CONDITIONAL,
+            conditions: ['user_id' => [1, 2, 3]]
+        );
+
+        $context = (new FeatureFlagContext())->withUserId('99');
+
+        expect($flag->isEnabledForContext($context))->toBeFalse();
+    });
+
+    it('handles percentage rollout', function () {
+        $flag = new FeatureFlag(
+            name: 'rollout-feature',
+            status: FeatureFlagStatus::CONDITIONAL,
+            conditions: ['percentage' => 50]
+        );
+
+        // Test with multiple user IDs to verify distribution
+        $enabledCount = 0;
+        for ($userId = 1; $userId <= 100; $userId++) {
+            $context = (new FeatureFlagContext())->withUserId((string) $userId);
+            if ($flag->isEnabledForContext($context)) {
+                $enabledCount++;
+            }
+        }
+
+        // Should be approximately 50% (allow some variance)
+        expect($enabledCount)->toBeGreaterThan(30);
+        expect($enabledCount)->toBeLessThan(70);
+    });
+
+    it('creates immutable copy with new status', function () {
+        $original = new FeatureFlag(
+            name: 'test-feature',
+            status: FeatureFlagStatus::DISABLED
+        );
+
+        $updated = $original->withStatus(FeatureFlagStatus::ENABLED);
+
+        expect($original->status)->toBe(FeatureFlagStatus::DISABLED);
+        expect($updated->status)->toBe(FeatureFlagStatus::ENABLED);
+        expect($original)->not->toBe($updated);
+    });
+
+    it('creates immutable copy with new conditions', function () {
+        $original = new FeatureFlag(
+            name: 'test-feature',
+            status: FeatureFlagStatus::CONDITIONAL
+        );
+
+        $updated = $original->withConditions(['user_id' => [1, 2]]);
+
+        expect($original->conditions)->toBeEmpty();
+        expect($updated->conditions)->toBe(['user_id' => [1, 2]]);
+    });
+
+    it('creates immutable copy with expiration', function () {
+        $original = new FeatureFlag(
+            name: 'test-feature',
+            status: FeatureFlagStatus::ENABLED
+        );
+
+        $expiry = Timestamp::fromTimestamp(time() + 3600);
+        $updated = $original->withExpiration($expiry);
+
+        expect($original->expiresAt)->toBeNull();
+        expect($updated->expiresAt)->toBe($expiry);
+    });
+
+    it('handles multiple conditions', function () {
+        $flag = new FeatureFlag(
+            name: 'multi-condition',
+            status: FeatureFlagStatus::CONDITIONAL,
+            conditions: [
+                'environment' => 'production',
+                'user_id' => [1, 2, 3]
+            ]
+        );
+
+        $matchingContext = (new FeatureFlagContext())
+            ->withEnvironment('production')
+            ->withUserId('2');
+
+        $nonMatchingContext = (new FeatureFlagContext())
+            ->withEnvironment('development')
+            ->withUserId('2');
+
+        expect($flag->isEnabledForContext($matchingContext))->toBeTrue();
+        expect($flag->isEnabledForContext($nonMatchingContext))->toBeFalse();
+    });
+});