- Mirror upstream #1786's nested-shell / executable-normalization hardening
into the fork-only pr_verdict_guard.py (verdict-gating is a real fork
control), keeping it in parity with pr_creation_guard.py.
- Close the glued short-flag bypass (bash -c'...') in BOTH guards: a shell's
-c argument can be concatenated into the same argv token, which the
space-separated -c detection missed. Diverges pr_creation_guard.py from
upstream #1786 by design; to be upstreamed.
- Gate the new #1799 sidebar active-thread refresh on ownership so a non-owner
viewing a shared thread reads last-known state without persisting a metadata
write (mirrors the is_owner gate on the single-thread read path).
- Fix an F821 in the #1799 cherry-pick (Mapping import / concrete dict type).
Guards remain intentionally fail-open per the honest-agent threat model;
docstrings narrowed to name the residual exotic-shell / stdin-fed vectors.
Adam Moussa
1ba5ccc65d