Revert SearchProcessTests to Ollama-gated behavior

Restore the original OLLAMA_AVAILABLE gating and remove the unrequested FTS-only config change.

Author: dluc

tests/Main.Tests/Integration/SearchProcessTests.cs

@@ -86,11 +86,9 @@ private async Task<string> ExecuteKmAsync(string args)
         return output.Trim();
     }
 
-    [Fact]
+    [OllamaFact]
     public async Task Process_PutThenSearch_FindsContent()
     {
-        this.WriteFtsOnlyConfig();
-
         // Act: Insert content
         var putOutput = await this.ExecuteKmAsync($"put \"ciao mondo\" --config {this._configPath}").ConfigureAwait(false);
         var putResult = JsonSerializer.Deserialize<JsonElement>(putOutput);
@@ -110,40 +108,6 @@ public async Task Process_PutThenSearch_FindsContent()
         Assert.Contains("ciao", results[0].GetProperty("content").GetString()!, StringComparison.OrdinalIgnoreCase);
     }
 
-    private void WriteFtsOnlyConfig()
-    {
-        var personalNodeDir = Path.Combine(this._tempDir, "nodes", "personal");
-        Directory.CreateDirectory(personalNodeDir);
-
-        var contentDbPath = Path.Combine(personalNodeDir, "content.db");
-        var ftsDbPath = Path.Combine(personalNodeDir, "fts.db");
-
-        var json = $$"""
-                   {
-                     "nodes": {
-                       "personal": {
-                         "id": "personal",
-                         "contentIndex": {
-                           "type": "sqlite",
-                           "path": {{JsonSerializer.Serialize(contentDbPath)}}
-                         },
-                         "searchIndexes": [
-                           {
-                             "type": "sqliteFTS",
-                             "id": "sqlite-fts",
-                             "path": {{JsonSerializer.Serialize(ftsDbPath)}},
-                             "enableStemming": true,
-                             "required": true
-                           }
-                         ]
-                       }
-                     }
-                   }
-                   """;
-
-        File.WriteAllText(this._configPath, json);
-    }
-
     [Fact]
     public async Task Process_BooleanAnd_FindsOnlyMatchingBoth()
     {
@@ -245,4 +209,15 @@ await this.ExecuteKmAsync($"put \"docker helm charts\" --config {this._configPat
         Assert.Contains(id1, ids);
         Assert.Contains(id2, ids);
     }
+
+    private sealed class OllamaFactAttribute : FactAttribute
+    {
+        public OllamaFactAttribute()
+        {
+            if (string.Equals(Environment.GetEnvironmentVariable("OLLAMA_AVAILABLE"), "false", StringComparison.OrdinalIgnoreCase))
+            {
+                this.Skip = "Skipping because OLLAMA_AVAILABLE=false (vector embeddings unavailable).";
+            }
+        }
+    }
 }