v0.6.5

Changed

• Polished the public README, documentation home page, onboarding route, and
  Python facade API reference with clearer use-case, operator-value,
  evidence-boundary, release-posture, and reader-routing guidance.
• Added an executive overview page for buyer, operator, and technical
  evaluation paths across domainpacks, dynamics, supervision, evidence, and
  frontier tracks.
• Bumped release metadata and regenerated the public capability inventory for
  the release-preparation pass.