Clean launch rough edges: artifacts, optional imports, docs extras, smoke script

[bordeauxred]

Why

Small repository rough edges become support burden when more users arrive.

What

• Decide whether tracked generated analysis artifacts are intentional. If not, remove them and add ignore rules.
• Add a docs extra so docs builds are reproducible.
• Add release tooling dependencies or document how to build/check artifacts.
• Add a public smoke script that runs the no-key demo, tests, package build, wheel install, and package audit.
• Avoid eager imports of heavy optional benchmark adapters from the package namespace.
• Make README snippets complete or explicitly label them pseudo-code.

Acceptance

• Public repo has no accidental generated artifacts.
• Docs/release checks are reproducible from documented commands.
• import clawloop remains cheap and does not require optional benchmark dependencies.

[bordeauxred]

Codex review (2026-04-19) — confirmed and amended:

• .codeboarding/ is in fact tracked (802KB analysis.json + ignore file). Remove it and add .codeboarding/ to .gitignore. This is the most reader-visible item in the bundle.
• Fold CITATION.cff into this issue as well — it's a 5-minute add that enables the GitHub "Cite this repository" widget.
• For "tighten optional imports": specifically verify python -c "import clawloop" does not import litellm, httpx, OpenTelemetry, SkyRL, or any benchmark adapter eagerly. The artifact CI job in Ship installed no-key math demo and verify it from the wheel #31 should assert this.