Tier 1 (cre demo): in-memory SQLite + tempfile .env rotator. Walks
through inventory -> before -> 4-step rotation -> after -> audit chain
verify. Narrates every step event live with green/red glyphs. Runs in
under 1 second on commodity hardware, no external deps.
Tier 2 (docker/docker-compose.yml): postgres:16, localstack
(secretsmanager), hashicorp/vault dev mode, plus a fake-GitHub Flask
app that mocks /user, POST/DELETE /user/personal-access-tokens.
config/demo-full.cr.example documents env vars for the full stack.
Also fixed env_file rotator newline preservation (lines(chomp: true)
+ explicit \n join) so the rotated file is properly delimited.
a19e8669d2