[setup] Register Jaah with HeyGen's MCP server

**User-only setup task.** Only a person can do the steps below (HeyGen must whitelist Jaah's domains). Runner: do NOT attempt the vendor-side steps and do not open a PR. Ask the operator once through AskUserQuestion (header `Human act`) to do the steps; when they say it is done, run **Runner validation** on dev and settle `no_pr` / `no_code_needed`, citing the observed result (never a secret value). If validation fails, name the step that looks wrong and ask once more. A person must do this: HeyGen's MCP server admits only clients HeyGen has approved, and asking for that needs a human at HeyGen. Once done, members connect HeyGen with one **Connect HeyGen** button. ## Steps 1. Sign in to HeyGen with the account that should own Jaah's access (a shared company account, never a personal one), and open: https://developers.heygen.com/mcp/overview 2. Follow the overview's domain whitelisting section to request access for a client not yet whitelisted: send HeyGen the request it asks for, naming the client Jaah. 3. Ask HeyGen to whitelist both console domains listed in the next step; Jaah registers itself (Dynamic Client Registration) once they are. 4. Give HeyGen both redirect URIs exactly as written: `https://app.dev.jaah.ai/api/credentials/connect/callback` (dev) and `https://app.jaah.ai/api/credentials/connect/callback` (prod), and both console origins: `https://app.dev.jaah.ai` and `https://app.jaah.ai`. 5. Never paste a client ID or secret into this task, a comment, a chat or an email. Reply here only with what you did. ## Runner validation On dev, create a HeyGen secret: **Connect HeyGen** ends on **Connected** and **Test** lists the server's tools. Read only the result, never the secret. ## Out of scope No code change. Do not edit the vendor spec, the catalog engine or any other credential. ## Done means - The operator confirmed HeyGen whitelisted both domains. - On dev, Connect HeyGen ends on **Connected** and **Test** lists the HeyGen MCP server's tools — cited from what you observed.