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/Performance/GarbageCollectionMonitorTest.php

@@ -0,0 +1,296 @@
+<?php
+
+declare(strict_types=1);
+
+use App\Framework\Performance\GarbageCollectionMonitor;
+use App\Framework\Performance\ValueObjects\GcStatus;
+use App\Framework\Performance\ValueObjects\GcResult;
+
+describe('GarbageCollectionMonitor', function () {
+    beforeEach(function () {
+        $this->monitor = new GarbageCollectionMonitor();
+    });
+
+    it('returns current GC status', function () {
+        $status = $this->monitor->getStatus();
+
+        expect($status)->toBeInstanceOf(GcStatus::class);
+        expect($status->runs)->toBeInt();
+        expect($status->collected)->toBeInt();
+        expect($status->threshold)->toBeGreaterThan(0);
+        expect($status->roots)->toBeInt();
+    });
+
+    it('gets number of GC runs', function () {
+        $runs = $this->monitor->getRuns();
+
+        expect($runs)->toBeInt();
+        expect($runs)->toBeGreaterThanOrEqual(0);
+    });
+
+    it('gets number of collected cycles', function () {
+        $collected = $this->monitor->getCollected();
+
+        expect($collected)->toBeInt();
+        expect($collected)->toBeGreaterThanOrEqual(0);
+    });
+
+    it('gets GC threshold', function () {
+        $threshold = $this->monitor->getThreshold();
+
+        expect($threshold)->toBeInt();
+        expect($threshold)->toBeGreaterThan(0);
+    });
+
+    it('checks if GC is running', function () {
+        $isRunning = $this->monitor->isRunning();
+
+        expect($isRunning)->toBeBool();
+    });
+
+    it('checks if GC is enabled', function () {
+        $isEnabled = $this->monitor->isEnabled();
+
+        expect($isEnabled)->toBeBool();
+    });
+
+    it('can force garbage collection', function () {
+        // Create some circular references to collect
+        $obj1 = new stdClass();
+        $obj2 = new stdClass();
+        $obj1->ref = $obj2;
+        $obj2->ref = $obj1;
+        unset($obj1, $obj2);
+
+        $result = $this->monitor->forceCollection();
+
+        expect($result)->toBeInstanceOf(GcResult::class);
+        expect($result->collected)->toBeInt();
+        expect($result->duration)->toBeInstanceOf(App\Framework\Core\ValueObjects\Duration::class);
+        expect($result->memoryFreed)->toBeInstanceOf(App\Framework\Core\ValueObjects\Byte::class);
+        expect($result->statusBefore)->toBeInstanceOf(GcStatus::class);
+        expect($result->statusAfter)->toBeInstanceOf(GcStatus::class);
+        expect($result->timestamp)->toBeInstanceOf(App\Framework\Core\ValueObjects\Timestamp::class);
+    });
+
+    it('provides efficiency metrics', function () {
+        $metrics = $this->monitor->getEfficiencyMetrics();
+
+        expect($metrics)->toHaveKeys([
+            'collection_rate',
+            'threshold_ratio',
+            'is_healthy',
+            'runs',
+            'collected',
+            'roots',
+            'threshold',
+        ]);
+
+        expect($metrics['collection_rate'])->toBeFloat();
+        expect($metrics['threshold_ratio'])->toBeFloat();
+        expect($metrics['is_healthy'])->toBeBool();
+    });
+
+    it('can take GC snapshot', function () {
+        $snapshot = $this->monitor->takeSnapshot('test_checkpoint');
+
+        expect($snapshot)->toHaveKeys(['label', 'timestamp', 'status', 'efficiency']);
+        expect($snapshot['label'])->toBe('test_checkpoint');
+        expect($snapshot['status'])->toBeArray();
+        expect($snapshot['efficiency'])->toBeArray();
+    });
+
+    it('can enable and disable GC', function () {
+        $this->monitor->disable();
+        expect(gc_enabled())->toBeFalse();
+
+        $this->monitor->enable();
+        expect(gc_enabled())->toBeTrue();
+    });
+});
+
+describe('GcStatus', function () {
+    it('creates from gc_status array', function () {
+        $status = GcStatus::fromGcStatus(gc_status());
+
+        expect($status)->toBeInstanceOf(GcStatus::class);
+        expect($status->runs)->toBeInt();
+        expect($status->collected)->toBeInt();
+        expect($status->threshold)->toBeInt();
+        expect($status->roots)->toBeInt();
+    });
+
+    it('creates current GC status', function () {
+        $status = GcStatus::current();
+
+        expect($status)->toBeInstanceOf(GcStatus::class);
+    });
+
+    it('calculates collection efficiency', function () {
+        $status = new GcStatus(runs: 10, collected: 50, threshold: 10001, roots: 100);
+
+        $efficiency = $status->getCollectionEfficiency();
+
+        expect($efficiency)->toBe(5.0); // 50 / 10
+    });
+
+    it('returns zero efficiency when no runs', function () {
+        $status = new GcStatus(runs: 0, collected: 0, threshold: 10001, roots: 0);
+
+        expect($status->getCollectionEfficiency())->toBe(0.0);
+    });
+
+    it('calculates threshold utilization', function () {
+        $status = new GcStatus(runs: 10, collected: 50, threshold: 1000, roots: 900);
+
+        $utilization = $status->getThresholdUtilization();
+
+        expect($utilization)->toBe(0.9); // 900 / 1000
+    });
+
+    it('checks if near threshold', function () {
+        $nearThreshold = new GcStatus(runs: 10, collected: 50, threshold: 1000, roots: 950);
+        $notNearThreshold = new GcStatus(runs: 10, collected: 50, threshold: 1000, roots: 500);
+
+        expect($nearThreshold->isNearThreshold(0.9))->toBeTrue();
+        expect($notNearThreshold->isNearThreshold(0.9))->toBeFalse();
+    });
+
+    it('determines if GC is healthy', function () {
+        $healthy = new GcStatus(runs: 10, collected: 50, threshold: 10000, roots: 100);
+        $unhealthy = new GcStatus(runs: 0, collected: 0, threshold: 1000, roots: 950);
+
+        expect($healthy->isHealthy())->toBeTrue();
+        expect($unhealthy->isHealthy())->toBeFalse();
+    });
+
+    it('converts to array', function () {
+        $status = new GcStatus(runs: 10, collected: 50, threshold: 10001, roots: 100);
+
+        $array = $status->toArray();
+
+        expect($array)->toHaveKeys([
+            'runs',
+            'collected',
+            'threshold',
+            'roots',
+            'running',
+            'collection_efficiency',
+            'threshold_utilization',
+            'is_healthy',
+        ]);
+    });
+});
+
+describe('GcResult', function () {
+    it('determines if GC was effective', function () {
+        $effective = new GcResult(
+            collected: 10,
+            duration: App\Framework\Core\ValueObjects\Duration::fromMilliseconds(5.0),
+            memoryFreed: App\Framework\Core\ValueObjects\Byte::fromBytes(1024),
+            statusBefore: new GcStatus(runs: 1, collected: 0, threshold: 10001, roots: 100),
+            statusAfter: new GcStatus(runs: 2, collected: 10, threshold: 10001, roots: 90),
+            timestamp: App\Framework\Core\ValueObjects\Timestamp::now()
+        );
+
+        $ineffective = new GcResult(
+            collected: 0,
+            duration: App\Framework\Core\ValueObjects\Duration::fromMilliseconds(5.0),
+            memoryFreed: App\Framework\Core\ValueObjects\Byte::fromBytes(0),
+            statusBefore: new GcStatus(runs: 1, collected: 0, threshold: 10001, roots: 100),
+            statusAfter: new GcStatus(runs: 2, collected: 0, threshold: 10001, roots: 100),
+            timestamp: App\Framework\Core\ValueObjects\Timestamp::now()
+        );
+
+        expect($effective->wasEffective())->toBeTrue();
+        expect($ineffective->wasEffective())->toBeFalse();
+    });
+
+    it('gets GC overhead in milliseconds', function () {
+        $result = new GcResult(
+            collected: 5,
+            duration: App\Framework\Core\ValueObjects\Duration::fromMilliseconds(12.5),
+            memoryFreed: App\Framework\Core\ValueObjects\Byte::fromBytes(2048),
+            statusBefore: new GcStatus(runs: 1, collected: 0, threshold: 10001, roots: 100),
+            statusAfter: new GcStatus(runs: 2, collected: 5, threshold: 10001, roots: 95),
+            timestamp: App\Framework\Core\ValueObjects\Timestamp::now()
+        );
+
+        expect($result->getOverheadMs())->toBeFloat();
+        expect($result->getOverheadMs())->toBeGreaterThan(0);
+    });
+
+    it('gets memory freed in megabytes', function () {
+        $result = new GcResult(
+            collected: 5,
+            duration: App\Framework\Core\ValueObjects\Duration::fromMilliseconds(5.0),
+            memoryFreed: App\Framework\Core\ValueObjects\Byte::fromBytes(1048576), // 1 MB
+            statusBefore: new GcStatus(runs: 1, collected: 0, threshold: 10001, roots: 100),
+            statusAfter: new GcStatus(runs: 2, collected: 5, threshold: 10001, roots: 95),
+            timestamp: App\Framework\Core\ValueObjects\Timestamp::now()
+        );
+
+        expect($result->getMemoryFreedMB())->toBe(1.0);
+    });
+
+    it('calculates efficiency score', function () {
+        $result = new GcResult(
+            collected: 5,
+            duration: App\Framework\Core\ValueObjects\Duration::fromMilliseconds(5.0),
+            memoryFreed: App\Framework\Core\ValueObjects\Byte::fromBytes(1048576),
+            statusBefore: new GcStatus(runs: 1, collected: 0, threshold: 10001, roots: 100),
+            statusAfter: new GcStatus(runs: 2, collected: 5, threshold: 10001, roots: 95),
+            timestamp: App\Framework\Core\ValueObjects\Timestamp::now()
+        );
+
+        $score = $result->getEfficiencyScore();
+
+        expect($score)->toBeFloat();
+        expect($score)->toBeGreaterThanOrEqual(0);
+        expect($score)->toBeLessThanOrEqual(100);
+    });
+
+    it('gets status changes', function () {
+        $result = new GcResult(
+            collected: 5,
+            duration: App\Framework\Core\ValueObjects\Duration::fromMilliseconds(5.0),
+            memoryFreed: App\Framework\Core\ValueObjects\Byte::fromBytes(1024),
+            statusBefore: new GcStatus(runs: 1, collected: 10, threshold: 10001, roots: 100),
+            statusAfter: new GcStatus(runs: 2, collected: 15, threshold: 10001, roots: 95),
+            timestamp: App\Framework\Core\ValueObjects\Timestamp::now()
+        );
+
+        $changes = $result->getStatusChanges();
+
+        expect($changes)->toHaveKeys(['runs_delta', 'collected_delta', 'roots_delta']);
+        expect($changes['runs_delta'])->toBe(1);
+        expect($changes['collected_delta'])->toBe(5);
+        expect($changes['roots_delta'])->toBe(-5);
+    });
+
+    it('converts to array', function () {
+        $result = new GcResult(
+            collected: 5,
+            duration: App\Framework\Core\ValueObjects\Duration::fromMilliseconds(5.0),
+            memoryFreed: App\Framework\Core\ValueObjects\Byte::fromBytes(1024),
+            statusBefore: new GcStatus(runs: 1, collected: 0, threshold: 10001, roots: 100),
+            statusAfter: new GcStatus(runs: 2, collected: 5, threshold: 10001, roots: 95),
+            timestamp: App\Framework\Core\ValueObjects\Timestamp::now()
+        );
+
+        $array = $result->toArray();
+
+        expect($array)->toHaveKeys([
+            'collected',
+            'duration_ms',
+            'memory_freed_bytes',
+            'memory_freed_mb',
+            'timestamp',
+            'was_effective',
+            'efficiency_score',
+            'status_before',
+            'status_after',
+            'status_changes',
+        ]);
+    });
+});