AgentCache 0.2.1
fix(harness): cpu_pct KeyError(1) that aborted larger-repo agentcache campaigns; per-repo errors now report Type: message + traceback instead of an opaque "1".
feat(harness): run/experiment histories now timestamped — runs.db completed_at, experiment completed_at, and per-pass started_at/completed_at.
Validation: Fresh human-interaction Docker experiment (fd.git + ripgrep.git, 2 passes, hook-pre-warmed human commit, fresh container per pass): both repos green, warm agentcache 12.6x (fd) and 15.3x (ripgrep) less bytes than naive. 49 tests pass.