hermes - 💡(How to fix) Fix OpenViking memory provider sends slash-skill scaffolding as search text [1 pull requests]

When a slash skill is invoked, Hermes expands the model-facing user message with the full skill body. The OpenViking memory provider currently uses that same turn text for background search prefetch and session sync.

That means OpenViking can receive synthetic skill instructions as search text instead of the user's actual instruction. In large skill invocations, this can create oversized search requests and can also store prompt scaffolding as user message content in the OpenViking session.

Expected behavior:

• For OpenViking prefetch/search, use only the user instruction associated with the slash-skill invocation.
• For OpenViking session sync, store only that user instruction as the user message.
• If a synthetic skill turn has no user instruction, skip the OpenViking prefetch/sync for that turn.
• Keep Hermes' global memory manager contract unchanged so other memory providers continue receiving the original turn text.