docs(session-handoff): v0.5.0 — headless ritual now built (session-close-ritual extension), agent_end rationale
RISK-2 drift fix: 'Не построен — follow-up' → points at the deployed extension (.common/lib/pi-extensions/session-close-ritual.ts), records why agent_end not agent_settled (live-verified), bump 0.4.0→0.5.0 (MINOR), dist rebuilt.
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