fix(security): Resolve SonarQube security hotspots

Introduce a default regex match timeout across the library to prevent potential ReDoS attacks (SonarQube rule S6444).
Implement `[OnDeserialized]` methods to re-establish object invariants and validate state after deserialization, addressing SonarQube rule S5766.

src/Strata.SqlTools.Snowflake/Breakdowns/ProcedureBreakdown.cs

@@ -1,4 +1,5 @@
 using System.Collections;
+using System.Runtime.Serialization;
 using System.Text;
 using SqlServerProcedureBreakdown = Strata.SqlTools.Breakdowns.SqlServer.ProcedureBreakdown;
 using StatementParser = Strata.SqlTools.Statements.Snowflake.StatementParser;
@@ -46,6 +47,15 @@ public class ProcedureBreakdown : SqlServerProcedureBreakdown
         Parameters = parameters ?? new Dictionary<string, string>();
     }
 
+    /// <summary>
+    /// Re-establishes invariants after deserialization, since deserialization bypasses the
+    /// constructors that normally initialize the procedure name and parameter collection
+    /// (SonarQube rule S5766).
+    /// </summary>
+    /// <param name="context">The streaming context for the deserialization operation.</param>
+    [OnDeserialized]
+    private void OnDeserialized(StreamingContext context) => RevalidateBreakdownState();
+
     /// <summary>
     /// Gets the SQL breakdown as a string for Snowflake.
     /// </summary>
@@ -157,7 +167,7 @@ public class ProcedureBreakdown : SqlServerProcedureBreakdown
             // Check if it's a CALL statement (Snowflake syntax) or EXEC (for compatibility)
             var sqlTrimmed = sql.TrimStart();
             if (!System.Text.RegularExpressions.Regex.IsMatch(sqlTrimmed, @"^\s*(CALL|EXEC|EXECUTE)\b",
-                System.Text.RegularExpressions.RegexOptions.IgnoreCase))
+                System.Text.RegularExpressions.RegexOptions.IgnoreCase, Strata.SqlTools.SqlBreakdown.Utilities.RegexDefaults.MatchTimeout))
             {
                 errorMessage = "SQL statement must start with CALL, EXEC, or EXECUTE.";
                 return false;
@@ -174,7 +184,7 @@ public class ProcedureBreakdown : SqlServerProcedureBreakdown
             // Pattern: CALL procedureName(param => value, ...)
             var callMatch = System.Text.RegularExpressions.Regex.Match(sql,
                 @"(?:CALL|EXEC|EXECUTE)\s+([^\s\(]+)(?:\s*\((.*?)\))?$",
-                System.Text.RegularExpressions.RegexOptions.IgnoreCase | System.Text.RegularExpressions.RegexOptions.Singleline);
+                System.Text.RegularExpressions.RegexOptions.IgnoreCase | System.Text.RegularExpressions.RegexOptions.Singleline, Strata.SqlTools.SqlBreakdown.Utilities.RegexDefaults.MatchTimeout);
 
             if (!callMatch.Success)
             {
@@ -192,7 +202,7 @@ public class ProcedureBreakdown : SqlServerProcedureBreakdown
                 // Parse parameters - Snowflake uses param => value syntax
                 var paramMatches = System.Text.RegularExpressions.Regex.Matches(parametersText,
                     @"(\w+)\s*=>\s*([^,]+)(?:,|$)",
-                    System.Text.RegularExpressions.RegexOptions.IgnoreCase);
+                    System.Text.RegularExpressions.RegexOptions.IgnoreCase, Strata.SqlTools.SqlBreakdown.Utilities.RegexDefaults.MatchTimeout);
 
                 foreach (System.Text.RegularExpressions.Match paramMatch in paramMatches)
                 {