v0.5.1

Install-hardening point release: fixes the most likely first-contact failure modes found in a systematic failure sweep — overnight bundling on large datasets, unattended-session auto-start, honored hardware-command failures, same-day rerun protection, a safer field-sweep confirmation, an uploader that refuses rehearsal bundles and diagnoses TLS/clock problems, and louder, more actionable packer errors on every vendor path. No schema or protocol changes; v0.5.0 bundles remain fully valid.