The NotFound arm of emit_chart now queries the recorded campaign runs:
records with a persisted trace_name whose stored campaign document
carries name == ARG. A unique match re-dispatches the existing charting
path onto the resolved handle; several matches refuse listing the
candidate handles in append order (refuse-don't-guess — re-running a
named invocation legitimately yields {campaign8}-0, -1, ...); zero
matches keep the not-found message verbatim. The exact trace-store
handle always wins; the name never becomes a store key (C18 untouched).
Guide §3 and the glossary tap entry document the name alternative.
closes#238
Brummel
18f8e72946