Add DisplayStats to format.go: returns "No runs recorded" when RunCount is
zero, otherwise a one-line "N runs, M failed, last X ms, avg Y ms, max Z ms"
summary. Wire a Statistics detail row into the jobs panel that refreshes via
updateDetails alongside the other runtime fields.
Tests: TestDisplayStats (nil/zero/normal/no-fail), TestUpdateStats (three
sequential fake runs through updateStats verifying all aggregate fields), and
five seed tests in runner/seed_test.go covering basic aggregation,
duration-less legacy logs, maxFiles capping, missing directory, and
unmatched log files.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
