fix: correct DefaultValue type for MinRelevance parameter

Fix type mismatch between DefaultValue(0.3) double and float property.
Spectre.Console.Cli SingleConverter requires exact type match.

Changed: DefaultValue(0.3) → DefaultValue(0.3f)

🤖 Generated with [Amplifier](https://github.com/microsoft/amplifier)

Co-Authored-By: Amplifier <240397093+microsoft-amplifier@users.noreply.github.com>

Author: dluc

src/Main/CLI/Commands/SearchCommand.cs

@@ -49,7 +49,7 @@ public class SearchCommandSettings : GlobalOptions
 
     [CommandOption("--min-relevance")]
     [Description("Minimum relevance score threshold (0.0-1.0, default: 0.3)")]
-    [DefaultValue(0.3)]
+    [DefaultValue(0.3f)]
     public float MinRelevance { get; init; } = 0.3f;
 
     [CommandOption("--max-results-per-node")]