Route definitional questions to the narrative docs, and tolerate misspelling

"What is Varaverk" matched the PURPOSE intent, so retrieval returned every
script's one-line purpose and the model answered that the context does not
define the system — while README.md sat in the index unread. A definitional
question with no explicit filter now goes to kind=readme.

Varaverk is a coined word with no spell-check, so it arrives as varavrk,
veraverk, varavek. Edit distance catches those without a pattern that needs
extending per typo. This is search, not identity — a near-miss only widens a
document search, unlike hostname resolution where it must never resolve.

Plugin/unraid/Tools/ai_chat_worker.php

@@ -107,6 +107,12 @@ $tRetrieve = 0.0;
 if ($profile === 'varaverk') {
     jw($jobFile, ['status' => 'retrieving']);
 
+    // A definitional question with no explicit filter goes to the narrative docs. Left alone,
+    // intent routing boosts PURPOSE and returns every script's one-line purpose, so the model
+    // reports that the context does not define Varaverk while README.md sits in the index
+    // unread. An explicit --kind from the user always wins.
+    if ($kind === '' && vv_ai_is_definitional($question)) $kind = 'readme';
+
     $r = vv_ai_retrieve($question, $kind);
     if (!$r['ok']) {
         jw($jobFile, ['status' => 'error', 'error' => $r['error'] ?? 'retrieval failed']);
@@ -265,7 +271,8 @@ if ($diagBlock !== '') {
 // ignore. Detection only ever makes the model MORE cautious, so a false positive costs a
 // redirect rather than a wrong answer.
 if ($profile === 'chat'
-    && preg_match('/\b[\w.-]+\.sh\b|\b[A-Z][A-Z0-9]*(_[A-Z0-9]+)+\b|\bvaraverk\b/', $question)) {
+    && (vv_ai_mentions_varaverk($question)
+        || preg_match('/\b[\w.-]+\.sh\b|\b[A-Z][A-Z0-9]*(_[A-Z0-9]+)+\b/', $question))) {
     $system .= "NOTE: the operator's message appears to name a specific Varaverk component. "
              . "You cannot see the documentation in this mode, so you do not know what it does. "
              . "Say that plainly, point them at the Varaverk Assistant profile, and do not "