KarpelesLab / slirp / 23948285904

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Add mass connection stress tests: 1K, 10K, 100K concurrent TCP

New test file vtcp/nettest/mass_test.go stress-tests the TCP stack with
thousands of simultaneous connections, each transferring random data.

Results (i9-14900K, zero-delay direct delivery):
  1K conns:   14ms,  284 MB/s,   69K conns/s (4KB/conn)
  10K conns:  49ms,  842 MB/s,  205K conns/s (4KB/conn)
  100K conns: 130ms, 787 MB/s,  768K conns/s (1KB/conn)

Zero failures across all tests. All data integrity verified.

Implementation:
- directPair() creates two vtcp.Conn with synchronous delivery using
  atomic.Pointer for safe writer references during concurrent setup
- SetupForHandshake() allows manual SYN-SENT state for test handshakes
- Per-connection buffer sizes reduced (64KB) to handle many connections
- Semaphore limits concurrent goroutines to 1000
- 10K/100K tests skip in -short mode

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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