Fix planted typo on /helloworld: famliy -> family (fixes #11)

[tadaokatzuki]

What this changes

Fixes the planted typo on site/helloworld.html: famliy → family (line 14). One word, one line changed. Fixes #11.

Checklist

• Commits are signed off (git commit -s). See CONTRIBUTING.md
• If this adds an integration, integration.json and README.md are filled in
• No credentials, keys, or real customer data anywhere, including fixtures
• Tests and examples run offline against fixtures/, with no network calls
• Catch weight prices are labelled as estimates, if this displays prices

Anything we should know?

AI assistance, disclosed (per AGENTS.md rule 2). This pull request was prepared by an AI agent — opencode, model big-pickle — acting at the direction of Tadao Kazuki. The agent located the typo, applied the one-word fix, ran the four checks in AGENTS.md, and wrote the commit. Tadao Kazuki (human) signs the DCO and is accountable for the change.

All four checks pass locally:

• python3 tools/validate.py — 1 integration OK
• python3 tools/validate_site.py — 2 pages OK (helloworld.html validated)
• python3 tools/validate_disclosure.py — 29 files, no business-sensitive disclosure
• python3 examples/catalog_client.py --file fixtures/catalog.sample.json — OK

No network traffic was sent to the live site. The paragraph inviting people to find the typo was left intact.

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