Sub-issue of #519 (P1). Surfaced by the Conductor OSS CVE scan (target `python-sdk`). **Upgrade `pyasn1` 0.6.3 → 0.6.4** clears: - CVE-2026-59884 — DoS via crafted ASN.1 (high) - CVE-2026-59885 — DoS via crafted ASN.1 (high) - CVE-2026-59886 — DoS via crafted ASN.1 (high)
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