e2e: ungate comfyui-05/-06/-07/-09/-10/-13 from @requires-os:linux #697

Current behavior

#629 asked to either ungate every Linux-only ComfyUI install/status scenario in comfyui.feature or document why full e2e coverage of that path is Linux-only by design. #637 did the first half: comfyui-01/-02/-03 now plant Windows-portable fixtures and dropped @requires-os:linux.

That PR's plant_ready_runtime change also made comfyui-05/-06/-07/-09/-10/-13 (the reinstall scenarios) stop needing a POSIX shell for their runtime Python — they already plant the same Windows-portable fake-python stand-in comfyui-01/-02/-03 use. They still carry @requires-os:linux because nobody has run their reinstall behavior on Windows yet, not because of a remaining shell dependency.

Expected behavior

Drop @requires-os:linux from comfyui-05/-06/-07/-09/-10/-13 and confirm them on the Windows e2e lane, closing the remaining part of #629's ask. (comfyui-04, -08, -11, -12 stay Linux-only for their own, separate reasons: a real PTY, or a sh -c/shell-shim dependency documented in comfyui.feature's header comments.)

Scope note

Split out of #637 to keep that PR scoped to the fixture fix #629 asked for; this is the remaining half.