feat(.ai): washing machine workflow skills

[marissahuysentruyt]

Description

⚠️ SECOND MERGE ⚠️
Can be merged in parallel to #6136 and #6139

Adds eight on-demand skills under .ai/skills/ that map Phase 1–8 of the washing machine 1st-gen → 2nd-gen component migration workflow. Each skill includes YAML frontmatter (name, description), a short mindset for the agent, when to use / when not to use (where applicable), example invocations, and a workflow pointer to the matching anchor in 01_washing-machine-workflow.md.

Skill	Phase
migration-prep	1 — Preparation
migration-setup	2 — Setup
migration-api	3 — API
migration-styling	4 — Styling
migration-a11y	5 — Accessibility
migration-testing	6 — Testing
migration-documentation	7 — Documentation
migration-review	8 — Review

NOTE: This work is based on marissahuysentruyt/feat-agnostic-folder-ai-stuff (tool-agnostic .ai/ layout, AGENTS.md, Cursor/Claude symlinks). After marissahuysentruyt/feat-agnostic-folder-ai-stuff merges, retarget to main or merge the stack in order.

Motivation and context

The washing machine doc already defines phases and quality gates. Dedicated per-phase skills give agents a single file to load with the right mindset and a direct link into the canonical workflow, reducing drift between “run phase N” requests and CONTRIBUTOR-DOCS steps.

Related issue(s)

swc-1887

Screenshots (if appropriate)

N/A.

Author's checklist

• I have read the CONTRIBUTING and PULL_REQUESTS documents.
• I have reviewed at the Accessibility Practices for this feature, see: Aria Practices
• I have added automated tests to cover my changes.
• I have included a well-written changeset if my change needs to be published.
• I have included updated documentation if my change required it.

Reviewer's checklist

• Includes a Github Issue with appropriate flag or Jira ticket number without a link
• Includes thoughtfully written changeset if changes suggested include patch, minor, or major features
• Automated tests cover all use cases and follow best practices for writing
• Validated on all supported browsers
• All VRTs are approved before the author can update Golden Hash

Manual review test cases

• Open 01_washing-machine-workflow.md in CONTRIBUTOR-DOCS and confirm each skill’s “Workflow” link matches the correct Phase # section (checking that the anchors are still valid).
• Skim mindset and "when to use" sections for consistency with the workflow doc (no contradictory phase ordering).
• Confirm skill name and description in frontmatter are clear for tool discovery (Claude/Cursor skill pickers).
• Feel free to try one or any of the skills in isolation if you're in the middle of a component migration.

Device review

• Did it pass in Desktop?
• Did it pass in (emulated) Mobile?
• Did it pass in (emulated) iPad?

Accessibility testing checklist

• Keyboard
  Documentation only.

• Screen reader
  Documentation only.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 48c892b

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[github-actions]

📚 Branch Preview Links

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🔍 First Generation Visual Regression Test Results

When a visual regression test fails (or has previously failed while working on this branch), its results can be found in the following URLs:

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Deployed to Azure Blob Storage: pr-6127

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[marissahuysentruyt]

TODO: add brief descriptions to the .ai/README for each new skill?

[caseyisonit]

love this

[marissahuysentruyt]

marking as blocked until #6128 gets merrrrged