On Windows, a black console (conhost) window flashed briefly when CodeGraph
ran as a background MCP server. Several child spawns were missing
`windowsHide: true`, so Windows created a visible console for the child:
- scripts/npm-shim.js — launching the bundled runtime (every server start /
daemon-idle reconnect) and the self-heal `tar` extraction of a missing
platform bundle.
- src/reasoning/login.ts — the detached `cmd /c start` browser open.
- src/upgrade/index.ts — package-manager spawn (console-attached, so no flash
in practice, but set for uniformity: every child spawn now hides).
The daemon spawn (#411) and all git execFileSync sites already set it; this
closes the remaining gaps. Adds an all-platforms source guard to
__tests__/npm-shim.test.ts asserting every spawn in the shim sets windowsHide.
Closes#1092
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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