docs: hero demo GIF header with gradient wordmark title card

[NotYuSheng]

Summary

Adds a hero GIF header to the README, built from a richer title-card demo with a gradient wordmark, tagline, version line, and a "made by" credit. The wordmark gradient is rendered vertically (top-down).

Commits

• docs: hero GIF header; drop tagline from banner art
• docs: richer title-card demo GIF (gradient wordmark, tagline, versions, made-by)
• docs: vertical (top-down) gradient on the demo wordmark

Notes

• Docs/demo only — no changes to ingestion, training, or library code.
• Tracks the final demo/demo.gif; the intermediate demo/demo.cast recording is left untracked as a local build artifact.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 98a65e08-73c5-4fc0-afa3-9805addcfb01

📥 Commits

Reviewing files that changed from the base of the PR and between ab217fc and 1de5998.

⛔ Files ignored due to path filters (1)

• demo/demo.gif is excluded by !**/*.gif

📒 Files selected for processing (2)

• demo/build_final.py
• ingest/banner.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/demo-gif-header

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[gemini-code-assist]

Code Review

This pull request refactors the banner and demo GIF generation. It separates the lean CLI startup banner from a richer, multi-colored title card used for the README GIF, and simplifies the GIF rendering logic. The feedback recommends correcting a comment that mislabels the vertical gradient as horizontal, and restoring the terminal cursor at the end of the cast since it is hidden at the beginning.

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