Ship a demo/ project so someone can try throughline in 60 seconds

[jsirish]

What

There's no way to try throughline without wiring it into a real repo you care about. New users
have to install the plugin, trust it, and generate their own capture history before they see what
a populated HANDOFF.md or a live capture buffer actually looks like.

Prior art

adrrr/persistent-handoff ships demo/setup.sh plus demo/homelab/ — a small fictional repo
(a docker-compose homelab project) with a real, populated .claude/handoff.md already in it, a
project-scoped hook wired via demo/homelab/.claude/settings.json, and a README telling you
exactly what to type:

git clone https://github.com/adrrr/persistent-handoff && cd persistent-handoff
./demo/setup.sh && cd demo/homelab
claude --model claude-sonnet-5 --setting-sources project,local --strict-mcp-config \
  --tools Read,Glob,Grep,Skill,Write

Then: tell the agent a decision was made and a restart is coming, watch the skill rewrite the
handoff, /exit, restart, ask "where were we?", and see the answer come from the hook.

Fix shape

Add a demo/ directory with:

• A small fictional project plausible enough to make the capture buffer and HANDOFF.md read as
  real (not lorem-ipsum) — something with a few files, a git history, maybe a failing test or a
  known bug to "investigate."
• A setup.sh that wires the throughline hooks scoped to that project only.
• A populated example buffer and HANDOFF.md so someone can see the artifacts immediately, before
  generating their own.
• A short walkthrough in demo/README.md (or linked from the main README) of what to type to see
  capture → distill → resume in action.

This also becomes the fixture for #'s recording.