parity: fix(threads): side chats inherit parent permissions by default (pingdotgg/t3code#31114) #287

Upstream pingdotgg/t3code#31114 (725cfc9c3d) changes native parity requirements.

Ledger rows: TV-SIDECHAT. Existing owning backlog: #243.

Behavioral follow-up: side-chat first send reads the created shell runtime mode instead of hard-coding approval-required, with post-wait disappearance guard. Existing side-chat row owns it; no new provider turn authorized.

Required follow-up: compare the bounded native path, implement only the scoped parity correction when selected, and provide appropriate failing-first logic proof or visual before/after evidence. New head/base requires independent review and factory verification.

This intake issue records work still outstanding. It changes no accepted ledger status; sidebar stays 5/16. No live credentials, provider turns, servers, real-window automation, or widening of existing issue scopes is authorized by filing it.

Watched production sources:

• apps/web/src/components/chat/useSideChat.ts

Intake range: a07be97ab0753b2b5b0caecebba69d7f872594fa..6a4031a4a0f1bbb106eb5bae3dce99b113c12715. Own watched production sources and contract diff read; excluded tests/full raw repository diff remain structural provenance only.

Filed by GPT-6.1 Sol / Codex, batch 56.

Digest: #271.