fix: improve demo recording pipeline and regenerate GIFs

[DanWahlin]

Summary

• TUI scrolling fix: Added periodic hidden nudges (space+backspace every 3s) in tape files to keep the copilot TUI scrolled to the input area during streaming responses
• VHS compatibility: Fixed multi-line prompt splitting and added missing framerate setting that was causing parse errors
• Timing tuning: Bumped responseWait values across demos so recordings complete before cutoff (default 40s, per-demo up to 120s)
• Pipeline cleanup: Removed scan:demos from pipeline to preserve curated config, removed unreliable full-review-demo (9 prompts, ~10min), added preview-gifs.js for quick visual validation
• Regenerated all 17 demo GIFs with improved settings

Test plan

• Spot-check GIFs in each chapter to verify demos show complete responses with input area visible
• Run node .github/scripts/preview-gifs.js to extract preview frames and visually verify
• Run npm run create:tapes to verify tape generation still works
• Confirm no sample project files were modified

🤖 Generated with Claude Code

[Copilot]

Pull request overview

This PR improves the demo recording pipeline for a GitHub Copilot CLI course by addressing TUI scrolling issues in VHS tape recordings, fixing multi-line prompt handling, tuning response wait times, removing an unreliable long-running demo, and adding a utility for quick visual validation of generated GIFs.

Changes:

• Replaced single Sleep wait blocks in tape files with periodic hidden space+backspace nudges (every 3s) to keep the copilot TUI scrolled to the input area during streaming responses, and bumped responseWait values so recordings complete fully
• Removed the full-review-demo (9 prompts, ~10min) from demos.json and cleaned up its tape file, GIF, and README reference; also removed scan:demos from the generate:demos pipeline
• Added preview-gifs.js utility for extracting preview frames from GIFs, fixed multi-line prompt splitting in create-tapes.js, and added missing framerate setting to scan-demos.js

Reviewed changes

Copilot reviewed 24 out of 43 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
.github/scripts/create-tapes.js	Added nudge generation logic, multi-line prompt splitting, and final nudge before exit
.github/scripts/demos.json	Bumped default responseWait to 40, per-demo waits up to 120, removed full-review-demo
.github/scripts/scan-demos.js	Added framerate: 15 to default settings
.github/scripts/preview-gifs.js	New utility to extract preview frames from demo GIFs
package.json	Removed scan:demos from generate:demos pipeline
07-putting-it-together/README.md	Removed full-review-demo details/GIF reference
07-putting-it-together/images/full-review-demo.tape	Deleted
07-putting-it-together/images/full-review-demo.gif	Deleted
.gitignore	Added demo-previews directory
**/images/*.tape (16 files)	Regenerated with nudge pattern and updated wait times

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[Copilot]

The framerate: 15 default added here diverges from the framerate: 10 used in demos.json (line 8). Similarly, responseWait: 25 and exitWait: 2 here don't match the updated demos.json values of responseWait: 40 and exitWait: 3. While scan:demos was removed from the generate:demos pipeline, it's still available as a standalone script (npm run scan:demos). Running it would overwrite demos.json with these stale defaults, undoing the curated settings. Consider updating the defaults here to match demos.json, or adding a comment noting these are intentionally different.

Suggested change

	framerate: 15,
	startupWait: 5,
	responseWait: 25,
	exitWait: 2
	framerate: 10,
	startupWait: 5,
	responseWait: 40,
	exitWait: 3