domain-skills: add Dynadot DNS editing skill

[idigitalpro1]

Adds a domain skill for editing DNS records on dynadot.com.

Captures the durable shape of the site so the next agent doesn't pay the discovery tax:

• Auth wall — every DNS/account page is gated; the isolated harness profile only ever sees the public marketing SPA. Don't type credentials from a screenshot.
• Navigation map — public site is a Vue SPA; the Login control isn't a light-DOM text node; guessed login URLs (/account/sign_in, /login, etc.) all return the 200 SPA 404 shell, not redirects.
• js() helper gotchas — single-expression only; IIFEs and arrays-of-objects come back as None; empty arrays also surface as None; screenshots are DPR 2 while click_at_xy uses CSS pixels.
• Record-setting flow — Dynadot DNS vs Custom Nameservers, save, verify.
• Shell verification — dig/whois (no login needed).
• Trap log — including the 🟢 tab-title marker and the isolated-profile warning.

No secrets, coordinates, or task narration — just the map.

🤖 Generated with Claude Code

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Summary by cubic

Adds a Dynadot DNS editing skill with a durable site map and clear steps to update records. This reduces discovery time and avoids auth and harness pitfalls.

• New Features
  • Auth/session prerequisites for using a logged-in Chrome; do not type credentials.
  • Notes that no Dynadot API key is provided; prefer the API if a key exists.
  • Navigation map for the Vue SPA: guessed login URLs 404; how to reach DNS via the domain manager.
  • Harness js() quirks: single-expression only; arrays of objects and empty arrays return None; DPR 2 screenshots vs CSS-pixel clicks.
  • Record flow: choose Dynadot DNS vs Custom Nameservers, add/edit rows, save, verify.
  • Shell verification with dig/whois; trap log includes tab-title emoji and isolated-profile warning.

^{Written for commit 06aaa45. Summary will update on new commits.}

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