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* harden: secure extension and preset archive downloads Adopt the shared download-security primitives from #3140 across extension and preset catalog, package, direct-URL, and ZIP-install flows: - bound catalog, package, and inline manifest reads; - verify catalog SHA-256 values when present; - replace path-only extraction with bounded traversal/symlink-safe extraction; - validate malformed hosts and ports before opening download URLs; - handle normalized trailing-backslash directory entries consistently. Redirect enforcement and checksum verification remain owned by the shared helpers already on main; this commit wires them into extension and preset behavior. Assisted-by: OpenAI Codex (model: GPT-5, autonomous) * harden: close archive and catalog download edge cases Preflight ZIP central directories before ZipFile allocates them, bound both declared and actual payload sizes, and reject ambiguous or non-portable archive paths before extraction. Keep extension update manifest selection consistent with extraction, reject unsafe catalog-derived output filenames and malformed URL types, and escape untrusted values in download errors. Add regression coverage for parser differentials, collisions, platform-specific filenames, bounded call sites, and failure ordering. Assisted-by: OpenAI Codex (model: GPT-5, autonomous) * harden: address download security review feedback Assisted-by: OpenAI Codex (model: GPT-5, autonomous) * harden: close ZIP preflight review gaps Assisted-by: OpenAI Codex (model: GPT-5, autonomous) * fix: harden extension update preflight and rollback Assisted-by: OpenAI Codex (model: GPT-5, autonomous) * fix: harden extension update rollback Assisted-by: OpenAI Codex (model: GPT-5, autonomous)