fix(history): ranking (#46)

- I removed scoring system in history and it now only works in spec mode
- Also fix the AI suggestion placed in 3rd place instead of the first in
history mode ad7e2886950dc4e58b1cfac6fe15e4bb7a298865
- Clean up suggestions code

integration/history.go

@@ -225,7 +225,50 @@ func SearchHistory(query string, aliases map[string]string) ([]HistResult, error
 			}
 		}
 
-		matches := searcherCache.SearchWithScores(q, &fuzzy.SearchOptions{Limit: 200})
+		// extract pure prefix matches based strictly on recency order (historyCache is newest-first)
+		strictMatches := 0
+		for _, cmd := range historyCache {
+			if seenCmds[cmd] {
+				continue
+			}
+			fields := strings.Fields(cmd)
+			firstWordLow := ""
+			if len(fields) > 0 {
+				firstWordLow = strings.ToLower(fields[0])
+			}
+			
+			if queryFirstWord != "" {
+				if firstWordLow != queryFirstWord {
+					continue
+				}
+				if subcmdFilter && querySecondWord != "" {
+					if len(fields) < 2 {
+						continue
+					}
+					secondWordLow := strings.ToLower(fields[1])
+					if !strings.HasPrefix(secondWordLow, querySecondWord) {
+						continue
+					}
+				}
+			} else {
+				if !strings.HasPrefix(firstWordLow, qLow) {
+					continue
+				}
+			}
+			
+			seenCmds[cmd] = true
+			results = append(results, HistResult{
+				ID:         idMapCache[cmd],
+				Cmd:        cmd,
+				FuzzyScore: 10000,
+			})
+			strictMatches++
+			if strictMatches >= 200 {
+				break
+			}
+		}
+
+		matches := searcherCache.SearchWithScores(q, &fuzzy.SearchOptions{Limit: 1000})
 		for _, m := range matches {
 			if seenCmds[m.Str] {
 				continue