fix: ++/--/== の後に文字列が続く場合は反応しないよう修正

オペレーターの後に別の単語が続く場合（例: `:neko: -- Settings`）は
意図的な操作ではなく文章の一部である可能性が高いため、
++/--/== の直後がスペースのみ・行末・改行の場合のみ反応するよう正規表現を修正した。

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

Author: taki73

bot/bot.go

@@ -84,9 +84,9 @@ const (
 // Pre-compiled regexes for detecting point operations with targets
 var (
 	// User mention pattern: <@U123456> ++ (captures user ID and operator)
-	userOperationPattern = regexp.MustCompile(`<@([A-Z0-9]+)>[ 　]*(\+\+|-{2}|={2})`)
+	userOperationPattern = regexp.MustCompile(`<@([A-Z0-9]+)>[ 　]*(\+\+|-{2}|={2})[ 　]*($|\n)`)
 	// Emoji pattern: :emoji: ++ (captures emoji name and operator)
-	emojiOperationPattern = regexp.MustCompile(`:([a-zA-Z0-9_+-]+):[ 　]*(\+\+|-{2}|={2})`)
+	emojiOperationPattern = regexp.MustCompile(`:([a-zA-Z0-9_+-]+):[ 　]*(\+\+|-{2}|={2})[ 　]*($|\n)`)
 )
 
 // parseOperator converts an operator string to a PointOperation

bot/bot_test.go

@@ -383,6 +383,70 @@ func TestDetectOperationAndTarget(t *testing.T) {
 			wantTarget: "U123456",
 			wantIsUser: true,
 		},
+		// Operator must be at end of line or followed by newline
+		{
+			name:       "Emoji operator followed by text",
+			text:       ":nya-nya: -- Settings",
+			wantOp:     NoOperation,
+			wantTarget: "",
+			wantIsUser: false,
+		},
+		{
+			name:       "Emoji operator followed by text (plus)",
+			text:       ":neko: ++ foo",
+			wantOp:     NoOperation,
+			wantTarget: "",
+			wantIsUser: false,
+		},
+		{
+			name:       "Emoji operator followed by text (equals)",
+			text:       ":neko: == foo",
+			wantOp:     NoOperation,
+			wantTarget: "",
+			wantIsUser: false,
+		},
+		{
+			name:       "Emoji operator followed by trailing spaces",
+			text:       ":neko: ++   ",
+			wantOp:     PointUp,
+			wantTarget: "neko",
+			wantIsUser: false,
+		},
+		{
+			name:       "Emoji operator followed by newline",
+			text:       ":neko: ++\n",
+			wantOp:     PointUp,
+			wantTarget: "neko",
+			wantIsUser: false,
+		},
+		{
+			name:       "Emoji operator followed by newline and text",
+			text:       ":neko: ++\nsome text",
+			wantOp:     PointUp,
+			wantTarget: "neko",
+			wantIsUser: false,
+		},
+		{
+			name:       "User operator followed by text",
+			text:       "<@U123456> ++ foo",
+			wantOp:     NoOperation,
+			wantTarget: "",
+			wantIsUser: false,
+		},
+		{
+			name:       "User operator followed by trailing spaces",
+			text:       "<@U123456> ++   ",
+			wantOp:     PointUp,
+			wantTarget: "U123456",
+			wantIsUser: true,
+		},
+		{
+			name:       "User operator followed by newline and text",
+			text:       "<@U123456> ++\nsome text",
+			wantOp:     PointUp,
+			wantTarget: "U123456",
+			wantIsUser: true,
+		},
 	}
 
 	for _, tt := range tests {