Mitigate Completion Bias in Sunset Protocol

Context: Agents are prematurely triggering the Sunset Protocol immediately after finishing a PR and handing it off for review. This is caused by "Completion Bias" — treating a single completed task as a session boundary, completely ignoring the Anti-Trigger for review lifecycles.

The Problem: Because a single task is finished, the agent feels a false sense of "done" and wipes the session via the Sunset Protocol. This breaks the review loop because the session context is prematurely destroyed just as it should idle to await cross-model feedback.

The Architectural Reality: The rule forbidding sunsetting during a PR review halt exists in session-sunset-workflow.md §1.1. However, agents are missing it. It needs to be distilled ("map vs world atlas") into a tighter, impossible-to-miss anti-trigger right in the core AGENTS.md Pre-Flight or the session-sunset SKILL.md.

The Fix:

1. Codify "Completion Bias" mitigation: Explicitly separate "Task Complete / Yield Turn" from "Session Exhausted / Sunset".
2. Update .agents/skills/session-sunset/SKILL.md (or related references/session-sunset-workflow.md) to include a short, high-density warning against Completion Bias.
3. Keep the addition as short as possible (map vs world atlas).

Acceptance Criteria:

• Sunset protocol instructions are updated with a concise mitigation for Completion Bias.
• The updated rule explicitly differentiates "halting for peer review" from "sunsetting".

Origin Session ID: 7019b73d-72cf-42ab-8609-5387a2e66148