Give the assistant a standing memory file

A small operator-written file handed to the model at the start of every
conversation — who you are, how this install is set up, what has already been
decided. Injected ahead of the retrieved passages and marked operator-authored
so it outranks anything they contradict, and never cited as a source.

Deliberately not indexed and deliberately under DATA_DIR: it changes
constantly, vector similarity is the wrong way to retrieve things you were
told to remember, and gitignoring it keeps personal notes out of a pushed
repository. The character cap is a context budget — this text costs its share
of 16k on every single turn.

Plugin/unraid/Tools/ai_chat_worker.php

@@ -162,6 +162,19 @@ $system = "You are Varaverk's documentation assistant. Varaverk is this user's p
         . "not contain the answer, say so plainly and name what is missing — do not fill the "
         . "gap from general knowledge. Prefer the user's own terminology.\n\n";
 
+// Memory first, before the passages. It is the standing context — who the operator is and what
+// has already been decided — so it should frame everything that follows rather than read as one
+// more retrieved document. Marked as operator-authored so the model treats it as fact about the
+// installation rather than as a source to cite.
+$mem = vv_ai_memory_read();
+if ($mem['exists'] && trim($mem['text']) !== '') {
+    $system .= "WHAT YOU ALREADY KNOW ABOUT THIS OPERATOR AND INSTALLATION\n"
+             . "Written by the operator, not retrieved. Treat it as established fact about this "
+             . "system, prefer it over anything in the passages that contradicts it, and do not "
+             . "cite it as a numbered source.\n\n"
+             . trim($mem['text']) . "\n\n";
+}
+
 if ($diagBlock !== '') {
     $system .= "This is a diagnostic question, so live system state is included alongside the "
              . "documentation.\n\n"