Feat/attachment malware scanning - #1310
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/files/confirm now scans every confirmed upload after the magic-byte gate and before the file is queued: a flagged file has its blob deleted and its slot released, so it never reaches the session queue, the Linear ticket or the support team, and the widget shows "Malicious code detected". Scanning goes through a new IMalwareScanner seam over the file-malware-scanner Cloudflare worker (VirusTotal + Claude, /v1/scan). Each engine has its own policy — off (ignored), optional (only a positive detection blocks) or mandatory (a missing verdict blocks too, as a retriable scan_unavailable) — defaulting to Claude mandatory and VirusTotal optional, since VirusTotal's free tier rate-limits at 4 req/min and knows no hash for freshly created files. The feature is behind a master switch (off in production until validated on dev/preview) and every setting has an ASSISTANT_MALWARE_SCAN_* env override.
The three findings are the public contract address 0x0bA45A8b... used as a test fixture in variables named `token`; gitleaks reads it as a generic API key. Same finding already baselined for permissionsList.test.tsx under its pre-monorepo path — re-fingerprinted after the move to apps/app. Blocks every new branch push until baselined.
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E2E results (preview) Smoke
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