Verify vendor-specific HTTP status codes against current primary documentation

[MrAlfak]

Goal

Strengthen the vendor dataset by re-checking entries against current first-party documentation and improving provenance where possible.

Suggested providers

Work in small batches: Cloudflare, AWS Application Load Balancer, Nginx, Microsoft IIS, Laravel, Shopify, Pantheon, or other providers already present in data/vendors.json.

What to verify

• status number and phrase
• provider name
• current/legacy lifecycle
• description
• official documentation URL
• whether an entry should remain historical/community-sourced

Rules

• Prefer vendor-owned documentation.
• Do not collapse the same numeric code across providers.
• Keep provider-prefixed IDs stable when possible.
• If an official source cannot be found, document that clearly rather than overstating confidence.

Acceptance criteria

• At least one provider batch is re-verified.
• Source metadata is improved where possible.
• python tools/build_dataset.py and python tools/validate.py pass.
• Tests pass and generated codes.json is updated through the normal workflow.