Tell the skill never to paste a bare link

[elvinaspredkelis]

The bundled agent skill now carries the paste contract explicitly rather than by implication.

• Never a bare link, anywhere. Use paste.markdown or paste.url from the envelope, pick between them with the served paste.destinations table rather than a rule of the agent's own, and reach for krowk push --destination github where the destination is known. A bare link in a comment is a link nobody can tell anything about.
• Caption what a person will read. --caption is what the block says about a file; --title names the work and stays on the run. The quick reference now shows both, plus the before/after pair.
• Claim before pasting anywhere durable. An unclaimed artifact expires within the day, so an inline image in a pull request comment, an issue or a doc becomes a broken image nobody can fix later. The skill tells the agent to surface the claim step — key and token — to the person and let them decide, and exempts chat, which outlives nothing.

A test in internal/skill pins those lines, and fails if the skill ever spells out an image embed of its own — the forms come from the envelope, and an example is an invitation to build one.

Source task: https://app.basecamp.com/5483893/buckets/48355687/todos/10217911884

[github-actions]

fatal: couldn't find remote ref feature/skill-never-bare-link

github run