Scope a search to source groups

Use source_groups when you want to restrict results:

Call nordicsemi_search_sources with this question:
"How do I enable MCUboot image confirmation in the nRF Connect SDK v3.3.0?"
Restrict source_groups to ["documentation", "tutorials"] if those groups are listed.

If a requested group is unknown or stale, Nordic MCP returns corrective guidance instead of silently searching the wrong source. List the groups again and retry with the current name.

If you search all groups, inspect the trust notice returned with the results. Treat community answers as leads, not as authoritative configuration for another SDK release or board.