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.

.claude/settings.local.json

@@ -4,7 +4,18 @@
       "Skill(skill-creator)",
       "Bash(cat:*)",
       "Bash(python3:*)",
-      "Bash(find:*)"
+      "Bash(find:*)",
+      "Skill(nostr-websocket)",
+      "Bash(go build:*)",
+      "Bash(chmod:*)",
+      "Bash(journalctl:*)",
+      "Bash(timeout 5 bash -c 'echo [\"\"REQ\"\",\"\"test123\"\",{\"\"kinds\"\":[1],\"\"limit\"\":1}] | websocat ws://localhost:3334':*)",
+      "Bash(pkill:*)",
+      "Bash(timeout 5 bash:*)",
+      "Bash(md5sum:*)",
+      "Bash(timeout 3 bash -c 'echo [\\\"\"REQ\\\"\",\\\"\"test456\\\"\",{\\\"\"kinds\\\"\":[1],\\\"\"limit\\\"\":10}] | websocat ws://localhost:3334')",
+      "Bash(printf:*)",
+      "Bash(websocat:*)"
     ],
     "deny": [],
     "ask": []