Add Medium publishing domain skill

[changtimwu]

Adds agent-workspace/domain-skills/medium/publishing.md — the write path for Medium, complementing the existing read-oriented scraping.md (APIs) and article-hydration.md (DOM extraction).

Why

There is no public API for publishing to Medium (the legacy API stopped issuing integration tokens), so a story has to be composed by driving the editor. The mechanics are non-obvious and cost a lot of exploration to work out.

What it captures

• URLs: /new-story → /p/<id>/edit → /p/<id>/submission → /@handle/<slug>-<id>, plus the drafts list + delete path.
• Editor structure: the classic .js-postField contenteditable and the .graf--* block-type table (graf--title, graf--h3/h4, graf--p, graf--li, graf--pre, graf--blockquote).
• The key mechanic: inject content with a synthetic paste ClipboardEvent carrying text/html — Medium converts HTML → graf blocks. Includes the verified HTML→graf mapping (incl. inline <code> surviving as monospace).
• Title handling: the first <h1> of a fresh-editor paste becomes graf--title; or JS-place the caret in the title block and type (clicking the empty title block won't focus it).
• Multi-line code: newlines inside one <pre> collapse (also <br> and <pre><code>), so emit one <pre> per line.
• Tags: commit each via JS .focus() + a char-less trusted Enter — press_key("Enter") doesn't commit and comma is rejected.
• Traps: no API; new-draft creation throttles (editing an existing draft still saves); execCommand('delete') clearing corrupts the save model; beforeunload freezes navigation; Cmd+A won't register via CDP; retina DPR.

No run narration, pixel coordinates, or secrets — just the durable site map.

🤖 Generated with Claude Code

---

Summary by cubic

Adds a Medium publishing domain skill that documents how to compose and publish stories by driving the classic editor (no public publish API). Complements the read skills and shares the reliable write flow and pitfalls.

• New Features
  • Adds agent-workspace/domain-skills/medium/publishing.md.
  • Maps the publish flow: /new-story → /p/<id>/edit → /p/<id>/submission → canonical URL.
  • Details HTML-based synthetic paste to create graf blocks, including title handling and inline code.
  • Covers multi-line code (one <pre> per line) and committing tags with a focused Enter.
  • Notes traps: draft throttling, execCommand('delete') save issues, beforeunload dialogs, Cmd+A via CDP, and DPR tips.

^{Written for commit ad39448. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 1 file

_{Re-trigger cubic}