Replace mutable tag refs (@v4, @v5, @v1, @main) with 40-char commit
SHAs and a trailing `# vX.Y.Z` comment, per GitHub's hardening guidance.
Covers .github/workflows/, .docs/marketing/demo-recording/, and the
skill-evals fixture repos. Embedded YAML inside heredocs is also pinned.
No packages/ code changes, so no changeset.
- Rename package from 'machinen' to 'agent-ci' across all source, tests, scripts, configs, and docs
- Rename CLI binary from 'machinen' to 'agent-ci'
- Rename .machinen → .agent-ci, .env.machinen → .env.agent-ci, MACHINEN_* → AGENT_CI_*
- Rename --runner flag to --name/-n (--runner still accepted for compat)
- agent-ci-dev script now builds DTU before running CLI
- Extract YAML compatibility tables to cli/compatibility.md
- Expand CLI usage docs with per-command flag tables
- Document DOCKER_HOST support for remote Docker
Peter Pistorius