fix: remove cursor pointer from demo gif

[NotYuSheng]

Summary

Removes the stray cursor "pointer" from demo/demo.gif.

Two sources of the visible cursor:

1. Initial flash — the hide escape (\x1b[?25l) was emitted at t=0.2s, so the default cursor block showed for the first ~0.2s.
2. Looping end-pointer — the end-of-cast cursor restore (\x1b[?25h, added in docs: hero demo GIF header with gradient wordmark title card #39) made the cursor reappear on the final frame, flashing on every GIF loop.

Fix

• Emit \x1b[?25l at t=0.0 (cursor hidden from the very first frame).
• Drop the \x1b[?25h restore.

The restore only benefited playing the raw demo/demo.cast in a terminal — but that file is an untracked build artifact, and the committed GIF is what users see. agg has no hide-cursor flag, so this is handled in the cast timeline.

Regenerated demo/demo.gif with the fix. ingest/banner.py is untouched.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: fa612a63-034b-454b-8df3-dee9be192b26

📥 Commits

Reviewing files that changed from the base of the PR and between 70c8e41 and 1f6a395.

⛔ Files ignored due to path filters (1)

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

📒 Files selected for processing (1)

• demo/build_final.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/demo-gif-cursor

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[gemini-code-assist]

Code Review

This pull request updates the demo build script demo/build_final.py to hide the cursor starting from the very first frame by setting its delay to 0.0, and removes the cursor restoration command. There are no review comments, so I have no feedback to provide.

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