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New: Magic-byte lab + scenario playbooks for reproducible upload QA
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What changed
MIME / magic-byte sniffer lives at /tools/magic-byte-sniffer. Paste hex or sample a local file — everything stays in your tab (no uploads).
Scenario SEO landers under /scenarios/* pair long-form QA context with deep links like ?preset=pdf-upload-5mb or explicit ?ext=json&bytes=750000.
Starter ZIP bundles (tiny JSON + CSV + checklist text) now download directly from the generator card for onboarding handbooks.
How to use responsibly
Reserve extension/MIME mismatches for hardened systems you operate. Pair every upload test with server-side sniffers (python-magic, Tika, bespoke signature tables) and structured logging.
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