AIT-481: no third-party vendor names in customer-facing copy

[ord669]

AIT-446 set the rule: customer-facing copy does not name third-party vendors we have no business recommending. That pass cut Railway and Render from the development-advice page but left three logging libraries two paragraphs above it, and the same pattern survived elsewhere.

Cut in this PR:

• development-advice (docs + skill): "Already using pino, winston, or Sentry?" becomes "Already logging somewhere?"
• webhook-starter-kit README: the deploy-host list becomes "anywhere it gets a stable public URL"
• cli README: "industry norm for product CLIs (npm, Next.js, Vercel, Homebrew)" removed, the disclosure keeps saying telemetry is on by default

Kept on purpose: the CLI telemetry disclosure that names our own Sentry project (required transparency, not a recommendation), cloudflared references (our own tunnel), and the whatsapp-ai-agent template Vercel references (its actual deploy target).

https://linear.app/hookmyapp/issue/AIT-481/no-third-party-vendor-names-in-customer-facing-copy

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