fix(memory): relax trivial filter threshold + update broken tests

The < 2 units threshold was too strict: valid 2-word queries like
"enterprise bug" were blocked. Change to:
- units < 2 → trivial (single word/CJK char)
- content chars < 4 → trivial (too short regardless of units)

This allows "fix bug" (2 units, 6 chars) and "好的继续" (4 units, 4 chars)
while still filtering "bug" (1 unit), "好的" (2 units but 2 chars), etc.

Also update memory-search-semantic tests which used single-word
queries ("bug") — change to "download bug" to match real-world usage.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: IM.codes

src/context/memory-search.ts

@@ -123,9 +123,11 @@ export function isTrivialRecallQuery(text: string | undefined | null): boolean {
   // CJK: each ideograph/hangul/kana counts as a unit
   const cjkMatches = trimmed.match(/[\u3400-\u9FFF\uF900-\uFAFF\u3040-\u30FF\uAC00-\uD7AF]/gu);
   unitCount += cjkMatches?.length ?? 0;
-  // <= 2 units is trivial (single CJK word like "好的" = 2 chars, but meaningless)
-  if (unitCount <= 2) return true;
-  // Require at least 4 non-whitespace/punctuation characters
+  // Single unit (one word or one CJK char) is always trivial
+  if (unitCount < 2) return true;
+  // Require at least 4 non-whitespace/punctuation characters.
+  // Catches "好的" (2 CJK, 2 chars) but allows "fix bug" (2 words, 6 chars)
+  // and "enterprise bug" (2 words, 13 chars).
   const contentChars = trimmed.replace(/[\s\p{P}]/gu, '').length;
   if (contentChars < 4) return true;
   return false;

test/context/memory-search-semantic.test.ts

@@ -63,7 +63,7 @@ describe('memory-search semantic ranking', () => {
     });
 
     const result = await searchLocalMemorySemantic({
-      query: 'bug',
+      query: 'download bug',
       repo: namespace.projectId,
       limit: 2,
     });