chore: Update semantic-kernel to 1.39.3

- Update semantic-kernel constraint from >=1.0.0 to >=1.39.3
- Add override-dependencies to resolve azure-ai-projects version conflict
  (semantic-kernel 1.39.3 constrains azure-ai-projects~=1.0.0b12 but we need >=2.0.0b1)
- The override is safe as the functionality is compatible; only the version constraint was tightened in SK

Author: Johan Broberg

pyproject.toml

@@ -53,6 +53,13 @@ dev-dependencies = [
     "openai-agents",
 ]
 
+# Override semantic-kernel's azure-ai-projects constraint to allow 2.x
+# semantic-kernel 1.39.3 constrains azure-ai-projects~=1.0.0b12 but this repo needs >=2.0.0b1
+# The functionality is compatible; only the version constraint was tightened
+override-dependencies = [
+    "azure-ai-projects >= 2.0.0b1",
+]
+
 # Centralized version constraints for all external dependencies
 # Individual package pyproject.toml files declare dependencies by name only (no version)
 # uv applies these constraints during dependency resolution
@@ -76,7 +83,7 @@ constraint-dependencies = [
     "langchain >= 0.1.0",
     "langchain-core >= 0.1.0",
     "openai-agents >= 0.2.6",
-    "semantic-kernel >= 1.0.0",
+    "semantic-kernel >= 1.39.3",
 
     # --- Microsoft Agents SDK ---
     "microsoft-agents-activity >= 0.4.0",