Port zmx to Windows with ConPTY and Named Pipes

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Goal

Port zmx to Windows as one cross-platform codebase using ConPTY and Named Pipes while
preserving the real zmx CLI, wire protocol, labels, attach behavior, VT reconstruction,
and GraphCode's non-leader mouse-input behavior.

TDD gates

• Rebase the GraphCode mouse behavior onto current upstream
• Add platform interfaces without behavior changes
• Real zmx run under ConPTY
• Long-lived bidirectional attach
• Detach without killing the child
• Reconnect with libghostty-vt reconstruction
• Resize, Unicode, control events, labels, send, get, set, kill
• Defined and tested same-session multi-attach policy
• Client/daemon crash and stale-session cleanup
• Real coding-agent CLI compatibility

A custom proof protocol or raw-output snapshot does not satisfy this issue.

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Rebase fleet started from upstream bea5fe3 under branch zmx/rebase-graphcode-patch. Required RED/GREEN tests will preserve GraphCode non-leader mouse behavior without beginning the Windows backend.

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Accepted GraphCode mouse-input rebase published on branch zmx/rebase-graphcode-patch at 378384057aeb956978754ff87fc1f701ac70b276. RED/GREEN coverage expanded to 129 tests across SGR/X10, mixed mouse+keyboard, leadership takeover, SS3, Kitty CSI-u, ESC continuation, focus/reply suppression, and carry overflow.

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Accepted Windows IPC provider published on zmx/windows-ipc at bba8b237506a361bd4a3f1fea5f0b442ec446741. WSL 146/146, Windows 43/43, release 82/82; CLI parity, secure rendezvous/leases, concurrency/backpressure, worker lifecycle, packaging, and POSIX preservation reviewed clean. ConPTY integration resumes from this SHA.

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Accepted integrated Windows zmx branch published at 8e5df0b15e9df6fc53ff86fb494ee06236678a8c (zmx/windows-conpty). Final gates: Windows 63/63, WSL 162/162, build 17/17, release 82/82, run/attach/CLI/history/task/backpressure/Unicode/resize/crash/large-write/security parity, CMD injection regression, and startup failure cleanup reviewed clean.

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Accepted Windows attach branch published at 858727af10cdf43d66cb3733cff58dc90ec4b3dd (zmx/windows-attach). Final gates: Windows 92/92, WSL 162/162, release 95/95, BATS 44/44; VT reconstruction, detach/reconnect, multi-attach leadership/input/resize, classifier/protocol filtering, backpressure, crash and cleanup reviewed clean.

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Accepted coding-agent matrix branch published at 4e85e672d702336581dae0dd2b7b4aa7145cc7ef (zmx/windows-agent-tests). Copilot CLI 1.0.81-0: 13 pass, 0 fail, 41 honest auth/availability skips; generic ConPTY probes and strict cleanup pass. WSL 162/162, build 17/17, release 95/95, BATS 45 pass/3 explicit skips. Claude/Codex absent with diagnostics.