feat(pubsub): Add queue-based message retrieval and comprehensive integration tests

- Add PubSubQueue property to BaseClient for queue-based message access
- Enhance PubSubMessageHandler.GetQueue() to prevent mixing callback/queue modes
- Add 11 comprehensive integration tests for queue-based PubSub functionality
- Rename PubSubFFICallbackIntegrationTests to PubSubCallbackIntegrationTests
- Update unit tests to validate callback/queue mode separation
- Add testresults/ and reports/ to .gitignore
- Remove obsolete design documentation files

Tests cover:
- Standalone and cluster client queue retrieval
- Pattern subscriptions with queue mode
- Message ordering preservation
- Async operations with cancellation
- High volume message handling
- Multiple channel subscriptions
- Unicode and special character handling
- Error handling for mixed callback/queue modes

All 1,797 tests passing with 67.7% line coverage.

Signed-off-by: Joe Brinkman <[email protected]>

Author: jbrinkman

.gitignore

@@ -151,3 +151,7 @@ $RECYCLE.BIN/
 _NCrunch*
 
 glide-logs/
+
+# Test results and coverage reports
+testresults/
+reports/

PUBSUB_REFACTORING.md

@@ -0,0 +1,19 @@
+#!/bin/zsh
+# Streams all commands from Valkey and logs them to a file with timestamps in ./log directory.
+
+LOGDIR="./log"
+LOGFILE="$LOGDIR/valkey-monitor.log"
+
+# Ensure directory exists
+if [ ! -d "$LOGDIR" ]; then
+    mkdir -p "$LOGDIR"
+fi
+# Ensure log file exists
+if [ ! -f "$LOGFILE" ]; then
+    touch "$LOGFILE"
+fi
+
+# Run MONITOR and prepend timestamps using date
+valkey-cli MONITOR | while read -r line; do
+    echo "$(date '+[%Y-%m-%d %H:%M:%S]') $line"
+done >> "$LOGFILE"