fix: add mcp as explicit dependency in strands template

The strands template's mcp_client/client.py imports directly from the
mcp package, but mcp was not declared in pyproject.toml. It was only
available as a transitive dependency through strands-agents, which is
fragile coupling that may break on any strands-agents update.

Author: tejaskash

src/assets/__tests__/__snapshots__/assets.snapshot.test.ts.snap

@@ -2692,7 +2692,8 @@ dependencies = [
     "bedrock-agentcore >= 1.0.3",
     "botocore[crt] >= 1.35.0",
     {{#if (eq modelProvider "Gemini")}}"google-genai >= 1.0.0",
-    {{/if}}{{#if (eq modelProvider "OpenAI")}}"openai >= 1.0.0",
+    {{/if}}"mcp >= 1.19.0",
+    {{#if (eq modelProvider "OpenAI")}}"openai >= 1.0.0",
     {{/if}}"strands-agents >= 1.13.0",
 ]
 

src/assets/python/strands/base/pyproject.toml

@@ -14,7 +14,8 @@ dependencies = [
     "bedrock-agentcore >= 1.0.3",
     "botocore[crt] >= 1.35.0",
     {{#if (eq modelProvider "Gemini")}}"google-genai >= 1.0.0",
-    {{/if}}{{#if (eq modelProvider "OpenAI")}}"openai >= 1.0.0",
+    {{/if}}"mcp >= 1.19.0",
+    {{#if (eq modelProvider "OpenAI")}}"openai >= 1.0.0",
     {{/if}}"strands-agents >= 1.13.0",
 ]