fix(windows): add windowsHide to all spawn sites to prevent periodic console flash

[grim-susemi]

문제

Windows에서 주기적으로 senpi 이름의 콘솔 창이 깜빡이는 현상 보고.

원인

child_process.spawn에 windowsHide: true가 빠진 모든 spawn 지점에서 Windows가 conhost 창을 순간적으로 생성한다. 기존 코드에서는 hooks/command-runner.ts, core/tools/bash.ts 등 일부에만 windowsHide가 적용되어 있고, 아래 지점들은 누락되어 있었다:

• packages/coding-agent/src/cli.ts — 메인 진입 재-spawn
• packages/coding-agent/src/core/exec.ts — 범용 execCommand
• packages/coding-agent/src/core/tools/find.ts, grep.ts — fd/rg 헬퍼
• packages/coding-agent/src/modes/app-server/daemon.ts — app-server 데몬
• packages/coding-agent/src/modes/rpc/rpc-client.ts — RPC child
• packages/coding-agent/src/utils/open-browser.ts — 브라우저 런처
• packages/coding-agent/src/self-update-bootstrap.ts — npm 업데이트 스텝
• packages/coding-agent/src/modes/interactive/external-editor.ts — 외부 에디터
• packages/coding-agent/src/beta/omo-local-update-worker.ts — detached worker (detached:true 와 함께여도 windowsHide 필요)

주기성 자체는 정상 동작일 수 있다 (예: app-server 데몬 health-check / LSP 데몬 ensure, senpi update 백그라운드 worker 등) — 기능은 유지하되 창을 숨긴다.

수정

누락된 모든 spawn 호출에 windowsHide: true 추가. detached: true가 있는 곳도 Windows에서는 windowsHide가 별도로 필요하다.

검증

• 로컬 패치 후 senpi --help 정상
• grep -rn windowsHide packages/coding-agent/src 로 전체 커버리지 확인
• 재현: Windows에서 백그라운드 동작 시 콘솔 플래시 제거

영향

Windows 전용 동작만 변경, 다른 플랫폼 영향 없음.

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Summary by cubic

Prevents periodic console flashes on Windows by hiding all child processes. Previously some spawns briefly opened a conhost window; now every spawn site sets windowsHide:true and the central wrappers enforce it on win32.

• Central enforcement: utils/child-process.ts forces windowsHide:true for spawnProcess/spawnProcessSync on win32 unless a caller passes windowsHide:false (propagated through cross-spawn).
• Site coverage: adds windowsHide:true to remaining direct spawn/spawnSync/execFile calls across the CLI re-spawn, core exec/package manager, git probes, app-server daemon, RPC client, browser launcher, self-update flows, external editor, interactive helpers (tmux, gh, trash), extensions (Cursor OAuth probes, MCP diagnostics), and utilities (wl-copy, xattr/setfattr, which, --version probes); detached spawns now also hide on Windows.
• Types: Cursor OAuth VersionProbeOptions accepts windowsHide.
• Behavior unchanged off Windows.
• No migration. To intentionally show a console on Windows, pass windowsHide:false when calling spawnProcess/spawnProcessSync or in direct spawn/execFile options.

^{Written for commit 5628f5b. Summary will update on new commits.}