v0.5.0

• Auto-push (new Stop hook auto_push.sh): realizes the decision doctrine's T0 rule "pushing a work branch is reversible → act autonomously, never re-ask". At turn end inside a loop project the current work branch is pushed automatically — plain git push when it is ahead of its upstream, or git push -u origin <branch> on the first push. It is the active complement to decision_gate.sh, which blocks pushing a protected branch.
• Safe by construction: never pushes a protected_branches branch (a human gate stays a human gate), stands down when gate_push: true (direct-to-main repos where every push is already T2), never force-pushes or pushes tags, and a push failure is logged to .claude/loop/.last-push without ever blocking the turn.
• loop.config.md gains auto_push (default true); set auto_push: false to opt out. Absent key falls back to the default, so existing loops need no change.