Session greeting / parked items logic

Summary: The session greeting surfaces parked conversation items without first verifying whether those items were resolved in a subsequent session.

Steps to reproduce:

1. A conversation item is explicitly flagged as "parked for later" in session A.

2. In a later session B, the parked item is fully addressed and closed.

3. In session C (subsequent to B), the greeting re-surfaces the item as still pending.

Expected behavior: Before presenting a parked item in a greeting, the system should query conversation history to confirm the item has not already been resolved. If resolved, it should be omitted from the greeting.

Actual behavior: The greeting presents the parked item as unresolved regardless of subsequent session activity.

Impact: Creator is redirected to work already completed. Redundant handling of a closed topic. Erodes confidence in the system's continuity awareness.

Severity: Low / Medium. No data loss. UX degradation and trust erosion over repeated occurrences.

Suggested fix: Add a resolution-check step to the greeting logic that cross-references parked items against conversation history before surfacing them.