The production updater runs inline maintenance. Boot bootstrap uses the
shared step registries directly. Neither calls the standalone runner.
Remove its re-exec path and unused flags, but retain the scope CLI,
logging setup, step implementations, and boot registries.
The scope test rejects runner flags before any step runs. Seven tests
of the removed interface are replaced by this refusal contract. The
existing scope and boot behavior tests remain. Regenerate the import
record through its owner. Only the runner's two dependencies disappear.
Verification: 358 tests passed, 0 failed, 15 host skips. Ruff passed.
No installed-state update, full suite, push, or release.
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