v0.9.7

Headline: a fast, scriptable device health check (oxvif::health) — point
it at a camera and get a Pass/Warn/Fail/Skip conformance report with a Profile
S/T/G assessment, a readable alternative to the official ONVIF Device Test Tool.
Also adds the firmware-upgrade / system-restore upload-URI flow and corrects
two write-path XML bugs.

Added

• Health check — oxvif::health (opt-in, behind the health feature; pure
  library code over OnvifSession, no extra dependencies).
  • HealthCheck::new(url).with_credentials(..).run().await returns a
    HealthReport of per-check CheckResults (status + category + timing) plus
    a ProfileAssessment (S/T/G verdict). Display renders a readable summary.
  • Checks run concurrently and are read-only by default; opt into write/clock
    probes via the builder.
  • New examples/healthcheck.rs (--features health).
• Device firmware / restore (upload-URI flow) — start_firmware_upgrade()
  → FirmwareUpgradeStart and start_system_restore() → SystemRestoreStart.
  Each returns the upload URI + timing; the caller HTTP-POSTs the image/backup
  (the SOAP transport deliberately doesn't carry the binary payload).
• PartialEq derived on the video-encoder configuration types
  (VideoEncoderConfiguration, VideoEncoderConfigurationOptions, and related)
  so downstream code can diff configs without hand-written comparisons.

Fixed

• SetVideoEncoderConfiguration and PTZ SetConfiguration produced malformed
  request XML that some cameras rejected — corrected the element nesting/order.

Docs

• Recorded a read-path audit under docs/audit-2026-05.md.