Description
memory-core plugin's narrative session cleanup fails with 'missing scope: operator.admin' error every minute during light/rem/deep phase cleanup cycles.

Steps to reproduce

1. Enable memory-core with dreaming feature
2. Wait for narrative generation to complete (light/rem/deep phases)
3. Check logs: tail -f /tmp/openclaw/openclaw-*.log | grep 'narrative session cleanup'

Expected behavior
Subagent sessions created for narrative generation should be deleted without requiring operator.admin scope.

Actual behavior
memory-core: narrative session cleanup failed for {phase} phase: missing scope: operator.admin
This error repeats every minute for each phase (light, rem, deep).

Root cause analysis

1. dreaming-narrative-CRZ-WfHg.js:595 calls params.subagent.deleteSession({ sessionKey })
2. This triggers an HTTP request to gateway's /session-kill-http endpoint
3. The endpoint requires operator.admin scope via authorizeOperatorScopesForMethod('sessions.delete', requestedScopes)
4. The subagent's scoped session lacks operator.admin, causing 403 errors

Impact

• Core memory-core functionality works fine (narrative generation succeeds)
• Orphaned subagent sessions accumulate over time
• Log noise (3 warnings per minute per workspace)

Suggested fix
The sessions.delete method should be accessible to session owners without requiring operator.admin, similar to how sessions.abort works. Alternatively, memory-core should use a different session deletion mechanism.