- Root README.md: proper project overview with quick start
- Root AGENTS.md: add MAILHOG_SMTP_PORT, update env config note
- demo/README.md: add MailHog SMTP port (4019) to service table
- demo/scripts/validate-all.sh: fall back to demo.env.template
when demo.env not present, add MAILHOG_SMTP_PORT to required vars,
mask variable values in validation output
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