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/Async/AsyncChannelTest.php

@@ -0,0 +1,194 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Unit\Framework\Async;
+
+use App\Framework\Async\AsyncChannel;
+use App\Framework\Async\ChannelClosedException;
+use App\Framework\Async\FiberManager;
+use App\Framework\DateTime\SystemClock;
+use App\Framework\DateTime\SystemTimer;
+use Fiber;
+
+describe('AsyncChannel', function () {
+    beforeEach(function () {
+        $clock = new SystemClock();
+        $timer = new SystemTimer();
+        $this->fiberManager = new FiberManager($clock, $timer);
+    });
+
+    it('creates unbuffered channel by default', function () {
+        $channel = new AsyncChannel();
+        
+        $stats = $channel->getStats();
+        expect($stats['capacity'])->toBe(0);
+        expect($stats['buffered_items'])->toBe(0);
+    });
+
+    it('creates buffered channel with capacity', function () {
+        $channel = new AsyncChannel(capacity: 10);
+        
+        $stats = $channel->getStats();
+        expect($stats['capacity'])->toBe(10);
+    });
+
+    it('supports producer-consumer pattern with buffered channel', function () {
+        $channel = new AsyncChannel(capacity: 5);
+        $received = [];
+
+        // Producer fiber
+        $producer = $this->fiberManager->asyncCooperative(function () use ($channel) {
+            for ($i = 1; $i <= 3; $i++) {
+                $channel->send("item-{$i}");
+            }
+            $channel->close();
+        });
+
+        // Consumer fiber
+        $consumer = $this->fiberManager->asyncCooperative(function () use ($channel, &$received) {
+            try {
+                while (true) {
+                    $item = $channel->receive();
+                    $received[] = $item;
+                }
+            } catch (ChannelClosedException) {
+                // Channel closed, stop consuming
+            }
+        });
+
+        // Start fibers
+        $producer->start();
+        $consumer->start();
+
+        // Process until both terminated
+        while (!$producer->isTerminated() || !$consumer->isTerminated()) {
+            if ($producer->isSuspended()) {
+                $producer->resume();
+            }
+            if ($consumer->isSuspended()) {
+                $consumer->resume();
+            }
+        }
+
+        expect($received)->toBe(['item-1', 'item-2', 'item-3']);
+    });
+
+    it('blocks producer when buffered channel is full', function () {
+        $channel = new AsyncChannel(capacity: 2);
+        $sent = 0;
+
+        $producer = new Fiber(function () use ($channel, &$sent) {
+            for ($i = 1; $i <= 5; $i++) {
+                $channel->send("item-{$i}");
+                $sent = $i;
+            }
+        });
+
+        $producer->start();
+
+        // Producer should have sent 2 items and then blocked
+        expect($sent)->toBe(2);
+        expect($channel->count())->toBe(2);
+
+        // Receive one item to free space
+        $item = $channel->receive();
+        expect($item)->toBe('item-1');
+
+        // Resume producer
+        if ($producer->isSuspended()) {
+            $producer->resume();
+        }
+
+        // Should have sent one more
+        expect($sent)->toBe(3);
+    });
+
+    it('throws exception when sending to closed channel', function () {
+        $channel = new AsyncChannel(capacity: 5);
+        $channel->close();
+
+        expect(fn() => $channel->send('test'))
+            ->toThrow(ChannelClosedException::class);
+    });
+
+    it('throws exception when receiving from closed empty channel', function () {
+        $channel = new AsyncChannel(capacity: 5);
+        $channel->close();
+
+        expect(fn() => $channel->receive())
+            ->toThrow(ChannelClosedException::class);
+    });
+
+    it('allows receiving remaining items after close', function () {
+        $channel = new AsyncChannel(capacity: 5);
+        
+        $channel->send('item-1');
+        $channel->send('item-2');
+        $channel->close();
+
+        // Can still receive buffered items
+        expect($channel->receive())->toBe('item-1');
+        expect($channel->receive())->toBe('item-2');
+
+        // Now throws
+        expect(fn() => $channel->receive())
+            ->toThrow(ChannelClosedException::class);
+    });
+
+    it('supports non-blocking try operations', function () {
+        $channel = new AsyncChannel(capacity: 2);
+
+        // trySend succeeds when space available
+        expect($channel->trySend('item-1'))->toBeTrue();
+        expect($channel->trySend('item-2'))->toBeTrue();
+        expect($channel->trySend('item-3'))->toBeFalse(); // Full
+
+        // tryReceive succeeds when items available
+        $result = $channel->tryReceive();
+        expect($result['success'])->toBeTrue();
+        expect($result['value'])->toBe('item-1');
+
+        $result = $channel->tryReceive();
+        expect($result['success'])->toBeTrue();
+        expect($result['value'])->toBe('item-2');
+
+        $result = $channel->tryReceive();
+        expect($result['success'])->toBeFalse(); // Empty
+    });
+
+    it('provides accurate channel statistics', function () {
+        $channel = new AsyncChannel(capacity: 10);
+
+        $channel->send('item-1');
+        $channel->send('item-2');
+        $channel->send('item-3');
+
+        $stats = $channel->getStats();
+
+        expect($stats['capacity'])->toBe(10);
+        expect($stats['buffered_items'])->toBe(3);
+        expect($stats['is_closed'])->toBeFalse();
+
+        $channel->close();
+
+        $stats = $channel->getStats();
+        expect($stats['is_closed'])->toBeTrue();
+    });
+
+    it('counts buffered items correctly', function () {
+        $channel = new AsyncChannel(capacity: 5);
+
+        expect($channel->count())->toBe(0);
+
+        $channel->send('a');
+        expect($channel->count())->toBe(1);
+
+        $channel->send('b');
+        $channel->send('c');
+        expect($channel->count())->toBe(3);
+
+        $channel->receive();
+        expect($channel->count())->toBe(2);
+    });
+});