All changes land through Tangled pull requests created with the tang CLI; main is never pushed directly. AGENT.md (non-negotiables + the worktree hard rule), knowledge/workflows.md (git conventions gain the tang PR flow with the headless behind-check caveat), and knowledge/development-style.md (working-loop step 7) updated; DESIGN.md decisions log records the rule. Defense: process decision from Cameron (2026-07-06), recorded in the decisions log per the development-style decision; no game behavior changes.