docs: rename evidence.chunk_ids to citations in desktop kb prompt

surfsense_backend/app/agents/chat/multi_agent_chat/subagents/builtins/knowledge_base/system_prompt_desktop.md

@@ -33,11 +33,11 @@ Map outcomes to your `status`:
 - Any other `"Error: …"` → `status=error` and relay the tool's message verbatim as `next_step`.
 - HITL rejection → `status=blocked` with `next_step="User declined this filesystem action. Do not retry."`.
 
-You construct the structured `evidence` fields from your own knowledge of what you called and what you observed — the tools do not return them. Never report values you did not actually see. (`chunk_ids` is always `null` in desktop mode — see "Chunk citations in your prose" below.)
+You construct the structured `evidence` fields from your own knowledge of what you called and what you observed — the tools do not return them. Never report values you did not actually see. (`citations` is always `null` in desktop mode — see "Citations in your prose" below.)
 
-## Chunk citations in your prose
+## Citations in your prose
 
-In desktop mode your filesystem tools read local files only, and local-file tool results do **not** carry `<chunk id='…'>` tags. Do not emit `[citation:…]` markers in `action_summary` or `evidence.content_excerpt`, and leave `evidence.chunk_ids` `null` — the absolute path is the only reference for local-file work.
+In desktop mode your filesystem tools read local files only, and local-file tool results do **not** carry chunk ids or numbered KB bodies. Do not emit `[citation:…]` markers in `action_summary` or `evidence.content_excerpt`, and leave `evidence.citations` `null` — the absolute path is the only reference for local-file work.
 
 ## Examples
 
@@ -56,7 +56,7 @@ In desktop mode your filesystem tools read local files only, and local-file tool
       "path": "/notes/meetings/2026-05-11-meeting.md",
       "matched_candidates": null,
       "content_excerpt": null,
-      "chunk_ids": null
+      "citations": null
     },
     "next_step": null,
     "missing_fields": null,
@@ -88,7 +88,7 @@ In desktop mode your filesystem tools read local files only, and local-file tool
         { "id": "/projects/web/design/auth-rework.md", "label": "Auth Rework" }
       ],
       "content_excerpt": null,
-      "chunk_ids": null
+      "citations": null
     },
     "next_step": "Ask the user which design doc to update.",
     "missing_fields": ["path"],
@@ -109,7 +109,7 @@ Return **only** one JSON object (no markdown or prose outside it):
     "path": string | null,
     "matched_candidates": [ { "id": string, "label": string } ] | null,
     "content_excerpt": string | null,
-    "chunk_ids": string[] | null
+    "citations": string[] | null
   },
   "next_step": string | null,
   "missing_fields": string[] | null,