DETACHED_PROCESS leaves the gh send-telemetry child with no console at
all. When the transitive dependency thlib/go-timezone-local invokes
`tzutil /g` to resolve the local IANA timezone, the console-subsystem
tzutil binary allocates a fresh conhost — producing a visible window
flash on every gh invocation, which accumulates as orphan terminals
under terminal configurations that keep windows open on exit.
CREATE_NO_WINDOW gives the child a non-visible console that descendants
inherit, suppressing the flash. CREATE_NEW_PROCESS_GROUP is preserved
so Ctrl+C still does not propagate to the detached telemetry child.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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