feat: Add comprehensive stress test suite (v0.21.0) - Production Ready! 🎉

**PRODUCTION READINESS MILESTONE ACHIEVED**

Phase 6 (Final): Stress Testing - Added 5 comprehensive stress tests to validate
system behavior under extreme conditions and sustained load.

**Stress Test Suite:**

1. **stress_test_long_running_session** (5 minutes)
   - Sustained operation with continuous activity
   - Memory leak detection with baseline comparison
   - Periodic health checks every 30 seconds
   - Validates: Long-term stability, memory management
   - Success criteria: <50% memory growth over 5 minutes

2. **stress_test_many_concurrent_clients** (50 concurrent sessions)
   - Creates 50 sessions simultaneously
   - Concurrent operations from all sessions
   - 500 total commands (10 per session)
   - Validates: Concurrent connection handling, lock contention
   - Success criteria: All sessions operational, no crashes

3. **stress_test_memory_leak_detection** (100 cycles)
   - Repetitive create/destroy cycles
   - Statistical memory analysis across cycles
   - Detects gradual leaks through trending
   - Validates: Proper resource cleanup
   - Success criteria: <20% memory growth trend

4. **stress_test_high_output_volume** (500,000 lines total)
   - 100,000 lines per session x 5 sessions
   - Tests scrollback buffer limits
   - Validates output handling at scale
   - Validates: Buffer management, performance under load
   - Success criteria: Server remains responsive

5. **stress_test_rapid_operations** (1000 rapid commands)
   - Rapid-fire list/send-keys operations
   - Measures throughput (ops/sec)
   - Validates: Command processing pipeline
   - Success criteria: Server remains responsive

**Test Infrastructure:**
- Memory monitoring (macOS/Linux ps/proc)
- Uptime tracking
- Performance metrics (throughput, latency)
- Automated health checks
- All tests marked #[ignore] for manual execution
- Run with: cargo test --test stress_tests --release -- --ignored

**Production Readiness - 6 Phase Journey Complete:**
✅ Phase 1: Fix vim/Emacs rendering bugs (v0.20.7)
✅ Phase 2: Error handling - eliminate unwrap() (v0.20.8)
✅ Phase 3: Fix all clippy warnings (v0.20.8)
✅ Phase 4: Complete all TODO items (v0.20.9)
✅ Phase 5: Comprehensive integration tests - 25 tests (v0.20.10)
✅ Phase 6: Stress testing - 5 comprehensive tests (v0.21.0)

**Overall Test Coverage:**
- Unit tests: 247 tests (existing)
- Integration tests: 25 tests (new in v0.20.10)
- Stress tests: 5 tests (new in v0.21.0)
- Total: 277 automated tests

Ferrix is now production-ready for beta testing and early adopters! 🚀

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

Co-Authored-By: Claude <noreply@anthropic.com>

Author: DavidLiedle

CHANGELOG.md

@@ -7,6 +7,23 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.21.0] - 2025-10-09
+
+### Added
+- **Stress Test Suite**: Added 5 comprehensive stress tests for production validation
+  - **stress_test_long_running_session**: 5-minute sustained operation with memory leak detection
+  - **stress_test_many_concurrent_clients**: 50 concurrent sessions with concurrent operations
+  - **stress_test_memory_leak_detection**: 100 create/destroy cycles to detect memory leaks
+  - **stress_test_high_output_volume**: 100,000 lines x 5 sessions to test scrollback handling
+  - **stress_test_rapid_operations**: 1000 rapid commands to verify throughput
+  - All tests include memory monitoring, health checks, and performance metrics
+  - Tests marked #[ignore] for manual execution (resource-intensive, long-running)
+
+### Changed
+- **Version Bump to 0.21.0**: Production readiness milestone achieved
+  - All 6 phases of production readiness plan completed
+  - Ready for beta testing and early adopters
+
 ## [0.20.10] - 2025-10-09
 
 ### Added

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "ferrix"
-version = "0.20.10"
+version = "0.21.0"
 edition = "2021"
 authors = ["David Liedle", "Claude <noreply@anthropic.com>"]
 description = "A modern terminal multiplexer built with Rust, inspired by tmux and GNU Screen"