Repeaters penalize (and can blacklist) nodes that burst traffic, so
every trace-transmitting surface now sends exactly one transmission
per human action: Enter on the live screen runs a single trace (the
screen still aggregates the session's medians), the scenario probe
measures each candidate path once, and the CLI drops --samples to
become a true one-shot. trace_runner.measure and the s-key sample
cycle go with it.
Also de-pollute the target picker's "Recently traced" section: the
repository now returns a short recency-ordered list instead of the
ever-growing all-time tally, and stored hex prefixes fold back to
their contact names so a node shows once.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>