Replace regex-like helpers with canonical validators

[artiphishle]

What changed

• replace isEmailLike and isUrlLike with canonical validators
• add isEmail, isPhone, isUsername, and isHttpUrl
• remove public regex-pattern exports and the obsolete patterns.ts
• add focused validator coverage
• add a pre-1.0 minor changeset

Why

Consumers need a single authoritative validation API instead of ambiguous *Like heuristics or duplicated local validators.

Validation

GitHub CI is expected to run build, doctor, lint, format, Knip, tests, typecheck, and changeset checks.