Learn the operator's typos on first sighting, not on the third

A term alias decides what gets written to conf and has to be earned by repetition; a spelling
decides how a sentence is read, and the same typo is rarely made three times.

Plugin/unraid/include/ai_repair.php

@@ -915,6 +915,47 @@ function vv_ai_phrase_lookup(string $term, int $minSeen = 3): ?array {
     return vv_ai_phrase_aliases($minSeen)[strtolower(trim($term))] ?? null;
 }
 
+// ── Spellings ────────────────────────────────────────────────────────────────────────────────
+// The operator types quickly and knows it: "haversync" for "have rsync", "as it to the list" for
+// "add it". Recorded when the meaning was obvious in context, so the next occurrence is read
+// rather than puzzled over.
+//
+// Promoted on first sighting, unlike a term alias, and the difference is deliberate. A term alias
+// decides what gets written to conf, so it has to be earned by repetition. A spelling decides how
+// a sentence is read, costs a misreading at worst, and is rarely made identically three times —
+// requiring repetition would mean never learning any of them.
+//
+// Recorded only when the intent was actually clear. A guess written down here is worse than
+// leaving it out, because it will be applied silently every time afterwards.
+function vv_ai_spelling_record(string $said, string $typo, string $meant): bool {
+    $typo = strtolower(trim($typo));
+    $meant = trim($meant);
+    if ($typo === '' || $meant === '' || strcasecmp($typo, $meant) === 0) return false;
+    return vv_ai_phrase_record($said, $typo, $meant, 'spelling');
+}
+
+// What the operator most likely meant by a word, or null. Last writing wins, so a correction to
+// an earlier reading simply supersedes it.
+function vv_ai_spelling_lookup(string $word): ?string {
+    $word = strtolower(trim($word));
+    $hit  = null;
+    foreach (vv_ai_phrase_all() as $r) {
+        if (($r['kind'] ?? '') !== 'spelling' || ($r['outcome'] ?? '') === 'rejected') continue;
+        if (($r['term'] ?? '') === $word) $hit = (string)$r['target'];
+    }
+    return $hit;
+}
+
+function vv_ai_spellings(): array {
+    $out = [];
+    foreach (vv_ai_phrase_all() as $r) {
+        if (($r['kind'] ?? '') !== 'spelling' || ($r['outcome'] ?? '') === 'rejected') continue;
+        $out[(string)$r['term']] = (string)$r['target'];
+    }
+    ksort($out);
+    return $out;
+}
+
 // Terms that have been corrected and have not yet earned promotion — what the assistant is still
 // getting wrong, and the thing worth reading when asking why it keeps mistaking something.
 function vv_ai_phrase_unsettled(): array {