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 "

Plugin/unraid/include/ai.php

@@ -453,6 +453,35 @@ function vv_ai_retrieve(string $query, string $kind = '', string $section = '',
             'scanned' => $d['scanned'] ?? 0];
 }
 
+// ── Question shape ───────────────────────────────────────────────────────────────────────────
+//
+// "Varaverk" is a coined word with no spell-check and an awkward keyboard shape, so it arrives
+// misspelled often — varavrk, veraverk, varavek, varverk. Edit distance catches those without a
+// hand-written pattern that would need extending every time a new typo appears.
+//
+// This is search, not identity. The rule against fuzzy hostname matching is about deciding which
+// machine you are talking to, where a near-miss must never resolve; here a near-miss only widens
+// a document search, and the cost of being wrong is a slightly odd set of passages.
+
+function vv_ai_mentions_varaverk(string $q): bool {
+    foreach (preg_split('/[^a-z0-9]+/i', mb_strtolower($q), -1, PREG_SPLIT_NO_EMPTY) as $w) {
+        if (strlen($w) < 5 || strlen($w) > 12) continue;   // bound the comparison window
+        if ($w === 'varaverk' || levenshtein($w, 'varaverk') <= 2) return true;
+    }
+    return false;
+}
+
+// "What is Varaverk", "explain varavrk", "whats this thing do". Intent routing boosts PURPOSE
+// for these, which surfaces every script's one-line purpose and buries the top-level prose that
+// actually defines the system — so the model answers that the context does not define it, while
+// README.md sits in the index unread.
+function vv_ai_is_definitional(string $q): bool {
+    if (!vv_ai_mentions_varaverk($q)) return false;
+    return (bool)preg_match(
+        '/\b(what\'?s?|whats|define|definition|describe|explain|overview|tell me about|'
+        . 'purpose of|point of|elevator|in a nutshell)\b/i', $q);
+}
+
 // ── Memory ───────────────────────────────────────────────────────────────────────────────────
 //
 // A small operator-maintained file handed to the model at the start of every conversation.