Narrow the LockPresent predicate from bare "locked" (too broad) to
"stale lock" and "already locked" — the two phrases restic actually
emits. Replace TestRunCheckParsesLock with table-driven
TestRunCheckLockSniff covering both trigger phrases and a benign
"locked-file" line that must not set LockPresent. Add
TestRunStatsZeroSnapshots to pin that RunStats accepts zero-snapshot
JSON without error.
steve
e93eb2a060