docs(demo): add asciicast recording + GIF, embed in README

Adds a real recording of `aicertify demo` running end-to-end:

- `docs/demo.cast` — asciinema v2 cast (60 KB, 135 frames). Replayable
  with `asciinema play docs/demo.cast` for byte-exact byte-stream
  reproduction. Recorded against the rich-UX runner from the preceding
  commit, with OPENAI_API_KEY unset, so it shows what a fresh-install
  user actually experiences.

- `docs/demo.gif` — agg-rendered GIF (316 KB, 68 frames at 2× speed,
  monokai theme). Embedded in README right after the Quick Start so
  README visitors see the rich UX before they install anything: ASCII
  banner, spinners with emojis, MessageGroup panel, success markers,
  and the final report path. Renders inline in any markdown viewer
  including GitHub mobile.

CHANGELOG records both this artifact set and the rich-UX rewrite from
the preceding commit under [Unreleased].

Author: kmadan

CHANGELOG.md

@@ -7,6 +7,16 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+
+- **`aicertify demo` rewritten for the canonical rich-UX flow.** The previous demo runner produced plain `print()` output; it now mirrors [`examples/quickstart.py`](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.
+
 ## [0.7.1] — 2026-05-14
 
 ### Added

README.md

@@ -70,6 +70,10 @@ aicertify demo
 
 `aicertify demo` loads a bundled sample contract, evaluates it against the EU AI Act policy set via OPA, and writes `aicertify_demo_report.md` to the current directory. Open the report — that's what your audit deliverable looks like.
 
+<p align="center">
+  <img src="docs/demo.gif" alt="aicertify demo recording — banner, spinners, evaluation progress, generated report path" width="85%" />
+</p>
+
 For richer evaluations (LangFair fairness metrics, DeepEval content-safety scoring, PDF reports), see [`examples/quickstart.py`](examples/quickstart.py) and the [forkable example bots](examples/) — each ships an `input_contract.json`, a `policy_config.yaml`, and a `run.py`.
 
 ### For development