fix(browser): per-snapshot byte cap (L-5) - #77
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The browser capped history at 50 snapshots and elements at 500 per page, but a single snapshot could retain ~10 MB of extracted text. A hostile page could still push ~500 MB into memory. - Add maxBrowserSnapshotBytes (1 MiB) and truncate extracted content that exceeds it, appending a truncation marker. - Add TestBrowser_SnapshotByteCap regression test. - Document the cap in SECURITY.md and AGENTS.md. Closes L-5 in sec_findings.md.
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Closes L-5 in sec_findings.md.
Full test suite passes: go test ./... -count=1.