Add comprehensive connection resilience implementation plan (#4599)

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Added detailed multi-week implementation plan to CONNECTION_ARCHITECTURE.md with specific code implementations and prioritized roadmap for improving client-server connection reliability.

## Implementation Plan Overview

**Priority 1 (Week 1):** Critical fixes and diagnostics
- Fix Shardok security vulnerability (remove unauthenticated public access)
- Add comprehensive connection logging with structured metrics
- Reduce HTTP/2 keepalive to 15s for NAT traversal

**Priority 2 (Week 2):** State consistency and recovery
- Implement state resync mechanism with sequence numbers
- Add exponential backoff for reconnection attempts
- Create health monitoring UI for connection status visibility

**Priority 3 (Week 3):** Architecture improvements
- Consolidate heartbeat mechanisms (application-level + HTTP/2)
- Add circuit breaker pattern for cascading failure prevention
- Implement server-side metrics and monitoring

**Priority 4 (Week 4+):** Advanced features
- Adaptive keepalive parameters based on network conditions
- WebSocket fallback for environments with HTTP/2 issues
- Client-side prediction for improved UX during disconnections

## Includes
- Specific code implementations in C#, Scala, nginx, Python
- Complete testing strategy (unit, integration, load, manual)
- Success criteria with quantifiable metrics
- Monitoring & observability recommendations
- Security, performance, and rollback considerations

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude <noreply@anthropic.com>

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admin

2025-11-30 19:24:06 -08:00

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co-authored by Claude

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