Per-agent enum option (medium|high|xhigh, default medium) rendered into
the HYPERHIVE_EFFORT_LEVEL env var. The harness resolves effort as
operator-override-file -> this env -> medium and passes it to
claude --effort at turn launch (harness read+apply tracked separately).
Same declarative-default + runtime-override shape as hyperhive.model.
Umbrella: operator-controlled claude effort.
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