Implement comprehensive WebSocket subscription stability fixes

- Resolved critical issues causing subscriptions to drop after 30-60 seconds due to unconsumed receiver channels.
- Introduced per-subscription consumer goroutines to ensure continuous event delivery and prevent channel overflow.
- Enhanced REQ parsing to handle both wrapped and unwrapped filter arrays, eliminating EOF errors.
- Updated publisher logic to correctly send events to receiver channels, ensuring proper event delivery to subscribers.
- Added extensive documentation and testing tools to verify subscription stability and performance.
- Bumped version to v0.26.2 to reflect these significant improvements.

QUICK_START.md

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+# Quick Start - Subscription Stability Testing
+
+## TL;DR
+
+Subscriptions were dropping. Now they're fixed. Here's how to verify:
+
+## 1. Build Everything
+
+```bash
+go build -o orly
+go build -o subscription-test ./cmd/subscription-test
+```
+
+## 2. Test It
+
+```bash
+# Terminal 1: Start relay
+./orly
+
+# Terminal 2: Run test
+./subscription-test -url ws://localhost:3334 -duration 60 -v
+```
+
+## 3. Expected Output
+
+```
+✓ Connected
+✓ Received EOSE - subscription is active
+
+Waiting for real-time events...
+
+[EVENT #1] id=abc123... kind=1 created=1234567890
+[EVENT #2] id=def456... kind=1 created=1234567891
+...
+
+[STATUS] Elapsed: 30s/60s | Events: 15 | Last event: 2s ago
+[STATUS] Elapsed: 60s/60s | Events: 30 | Last event: 1s ago
+
+✓ TEST PASSED - Subscription remained stable
+```
+
+## What Changed?
+
+**Before:** Subscriptions dropped after ~30-60 seconds
+**After:** Subscriptions stay active indefinitely
+
+## Key Files Modified
+
+- `app/listener.go` - Added subscription tracking
+- `app/handle-req.go` - Consumer goroutines per subscription
+- `app/handle-close.go` - Proper cleanup
+- `app/handle-websocket.go` - Cancel all subs on disconnect
+
+## Why Did It Break?
+
+Receiver channels were created but never consumed → filled up → publisher timeout → subscription removed
+
+## How Is It Fixed?
+
+Each subscription now has a goroutine that continuously reads from its channel and forwards events to the client (khatru pattern).
+
+## More Info
+
+- **Technical details:** [SUBSCRIPTION_STABILITY_FIXES.md](SUBSCRIPTION_STABILITY_FIXES.md)
+- **Full testing guide:** [TESTING_GUIDE.md](TESTING_GUIDE.md)
+- **Complete summary:** [SUMMARY.md](SUMMARY.md)
+
+## Questions?
+
+```bash
+./subscription-test -h     # Test tool help
+export ORLY_LOG_LEVEL=debug  # Enable debug logs
+```
+
+That's it! 🎉