v0.7.2 — rich-UX demo + asciicast embed

Changed

• aicertify demo rewritten for the canonical rich-UX flow. The previous demo runner produced plain print() output; it now mirrors examples/quickstart.py exactly — uses the high-level application.create() + app.evaluate() API and wraps each step in print_banner, spinner, MessageGroup, and success markers from aicertify.utils.logging_config. Visually identical to the canonical SDK experience.
• CLI default verbosity now WARNING, not INFO. aicertify demo and aicertify evaluate no longer flood the terminal with INFO-level chatter from langfair, deepeval, the OPA policy loader, etc. Pass --verbose to opt back in (raises root logger to INFO and aicertify namespace to DEBUG).
• OPA policy_loader no longer warns on helper_functions/ — those .rego files are shared library code (reporting helpers, validation helpers), not policies, and were always meant to be skipped silently. Same for dot-prefixed config directories.

Added

• docs/demo.cast + docs/demo.gif — asciinema recording of aicertify demo running end-to-end, embedded near the top of the README so visitors see the rich UX before installing anything.