Gate finding (C11 r3 quality, Low): 5769ff4aa9 removed the only writer of
runtime_capabilities["answer_in_reasoning"] (the agent_init seed); every
remaining writer stores resolve_native_compaction_capabilities(), which
yields only native_compaction. The reader was an unconfigurable second
trust source that could override the live config read, reachable only
from a test seam. The test now opts in the way users do, through a
custom_providers capabilities block on its base_url.
Also import _entries_for_route from hermes_cli.config like its neighbour.