Align email scanner with shared hints

[alyldas]

Summary

• Add boolean email scanner checks and sink-based range streaming with early stop support.
• Accept shared-style text hints for cheap clean-text rejection while preserving legacy scan(input) output.
• Keep email-specific parsing, exclusions, and false-positive guards inside the email package.
• Extend email benchmarks with scanner setup, check(), no-dot @ text, hinted clean, and late-match rows.

Validation

• npm ci
• npm run check
• npm run benchmark:email
• npm pack --dry-run
• Public runtime exports and package dry-run contents reviewed

Benchmarks

Latest email benchmark highlights:

• check hinted short clean: 0.0002 avg ms
• check no-dot at text: 0.0048 avg ms
• check direct email: 0.0033 avg ms
• check late-match email: 0.1318 avg ms
• censor direct email: 0.0062 avg ms
• censor obfuscated email: 0.0061 avg ms
• censor late-match email: 0.2056 avg ms

Closes #31

No publish, no merge, no tag/release.

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