[HoungDev]

What changed

• add a lightweight animated terminal demo near the top of the README
• show real title, tag, and non-mutating image rename preview workflows
• add accessible alt text, a text transcript, concise before/after examples, and a focused Why Creator Toolkit section
• add a reproducible Pillow renderer that captures current CLI output using disposable sample files
• include the renderer and demo assets in the source distribution
• rebuild the demo in the Linux quality job and audit the optional demo dependency

Why

Prospective users can now understand the toolkit's core value within the first screen of the README. Contributors can reproduce the asset from documented commands instead of editing an opaque binary by hand.

Validation

• ruff check .
• ruff format --check .
• pytest --basetemp .test-tmp-readme-demo-suite — 48 passed, 93.79% coverage
• fresh environment install with .[demo], renderer execution, and pip check
• deterministic GIF rebuild — 900×506, 3 frames, 44,507 bytes
• dependency audit — no known vulnerabilities after upgrading the temporary environment's pip toolchain
• wheel and source distribution build plus twine check
• source distribution verified for the GIF, transcript, and renderer
• workflow YAML parse, README local-link/alt-text checks, and personal-path scan

Closes #6