Add icholy-ttygif devcontainer feature

[Copilot]

Adds a new community devcontainer feature that installs ttygif — a tool that converts ttyrec terminal recordings into animated GIFs.

Changes

• src/icholy-ttygif/devcontainer-feature.json — feature manifest; exposes a version option (default: latest)
• src/icholy-ttygif/install.sh — builds from the GitHub release source tarball (archive/refs/tags/{tag}.tar.gz) using make install PREFIX=/usr/local; installs apt dependencies gcc, make, imagemagick, ttyrec, x11-apps; locates the extracted directory via find to handle tags with or without a v prefix
• src/icholy-ttygif/NOTES.md — documents project link, install method, and the X11 runtime requirement (xwd/WINDOWID)
• test/icholy-ttygif/test.sh — verifies ttygif --version emits a semver string; uses WINDOWID=1 dummy value to bypass the mandatory X11 window-id check that fires before argument parsing
• README.md — adds feature row in alphabetical order between helix-editor.com and jj-vcs.dev

Notes

ttygif has no pre-compiled binary releases — only a source tarball. The only upstream release is 1.4.0 (2016); latest resolves to it via the releases API. At runtime, ttygif requires a live X server (WINDOWID env var); it can be installed in headless containers but needs Xvfb or similar to actually generate GIFs.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add feature icholy-ttygif</issue_title>
<issue_description>Files:

src/(FeatureName)/devcontainer-feature.json
src/(FeatureName)/NOTES.md
src/(FeatureName)/install.sh (make sure to set executable bit)
test/(FeatureName)/test.sh
.github/workflows/test.yaml
README.md

Releases:

https://github.com/icholy/ttygif/releases

Test the installation process extensively before submitting
Watch for files in releases, naming structure, etc.
Test CLI output extensively before writing the test file.

For NOTES.md:
Link to the project that is installed by the feature
Short description of what it does
Installation method
Other notes

Update README.md (in repo root). Add the feature, keep the alphabetical order</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add feature icholy-ttygif #45

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[sebst]

test fail

[Copilot]

test fail

Fixed in aa140ce. The failure was ttygif.c:34:10: fatal error: stdio.h: No such file or directory on ubuntu:latest and debian:latest — gcc alone doesn't include the C standard library headers. Replaced gcc make with build-essential which provides libc6-dev (and stdio.h).