Consume fpagent's fprint-device-status {available, device, captureAgentId}
in the /fingerprint wizard. Availability is tracked tri-state so an agent
that does not report it leaves capture working as before; the header tag
shows offline / no-scanner / ready, the capture panel warns, and capture is
disabled until a supported reader is attached.
Adds a vm-sandbox test for the wizard logic and the OpenSpec change
fpagent-device-availability, archived with the fingerprint-wizard spec.
- Landing shows the tool tiles only when signed in and a sign-in card
otherwise; the login callback now returns to /.
- New public /help page: intro plus a per-tool Carbon accordion.
- Nav restructured to Home, {services}, divider, Help, Sign In/Out in
both the header and the side nav; the header right keeps only the
identity chip. Side-nav logo enlarged, border removed, spacing
equalised. Sign-out modal no longer flashes before it is defined.
- Per-deploy asset versioning (?v=) with immutable asset caching and
no-store HTML; help step lists show their numbers again.
- Tests updated and extended (48 total).
adebisi-fa