The rebase onto main split the evidence-describer config into two: an
LLMAgentConfig under agents.evidence-describer and a worker-tuning
EvidenceDescriberConfig (Interval, StaleAfter, MaxConcurrency) at the
top level. Bootstrap was only populating the LLM half, leaving Interval
at zero — which panics the probod boot with "non-positive interval for
NewTicker" when the evidence description worker starts. Add the missing
fields with the same defaults main uses.
Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>