Add HubSpot contacts once, linked to the right company

**Objective:** Add `{full-name}` (`{email}`), `{job-title}` at `{company-name}`, as a HubSpot contact without creating duplicates.

**Step 1: Duplicate check**

Call `hubspot-get-contacts` with `email` = `{email}`. If a contact exists, show it and stop: offer the update-contact-details prompt instead.

**Step 2: Company**

If `{company-name}` is given, call `hubspot-get-companies` with `company-name.contains`. Also try `company-domain-name` = the part of `{email}` after the @, unless it is a free mail domain (gmail.com, outlook.com, yahoo.com and the like).

* One match: use its exact company name.
* Several: list them and ask which.
* None: ask whether to create the company. Only create it on an explicit yes.

**Step 3: Confirm**

Show first name, last name (split `{full-name}` on the last space), email, job title, company, and whether a company will be created. Wait for an explicit yes.

**Step 4: Create**

* If agreed, call `hubspot-add-company` once with `name` and, for a non-free domain, `domain`.
* Call `hubspot-add-contact` once with `email`, `first-name`, `last-name`, `job-title` and `company-name`.

**Step 5: Verify**

Call `hubspot-get-contacts` with `email` = `{email}` and report the stored record, including whether `company-id` is set.

**Rules & Guidelines:**

* Only `hubspot-add-company` (when agreed) and `hubspot-add-contact` may write, each once.
* Do NOT call any other write tool: `hubspot-add-deal`, `hubspot-add-ticket`, `hubspot-update-contact`, `hubspot-update-company`, `hubspot-update-deal`, `hubspot-update-ticket`, `hubspot-add-contact-note`, `hubspot-add-company-note`, `hubspot-add-deal-note`, `hubspot-add-ticket-note`.
* Do not set `owner-id`. No tool maps a person's name to a HubSpot owner ID, so leave ownership unchanged unless the user gives you a numeric owner ID.
* Do not set lifecycle stage or lead status unless the user asks.

**Validation:**

* If `{email}` is not a valid address, stop and ask for it.