Add M7.5 provider-attached skills system with Agent Skills spec compliance

src/cmdforge/runner.py

@@ -533,15 +533,22 @@ def execute_prompt_step(
 
     prompt = substitute_variables(prompt_template, variables, warn_non_scalar=verbose)
 
-    # Inject profile system prompt if specified
+    # Determine provider
+    provider = provider_override or substitute_variables(step.provider, variables, warn_non_scalar=verbose)
+
+    # Build context from the inside out so the final order is:
+    # profile system prompt -> skills -> user prompt.
+    if step.skills is not None:
+        from .skills import inject_skills
+        skill_names = None if "*" in step.skills else step.skills
+        prompt = inject_skills(prompt, provider, skill_names)
+
     if step.profile:
         profile = load_profile(step.profile)
         if profile and profile.system_prompt:
-            # Prepend system prompt to user prompt
             prompt = f"{profile.system_prompt}\n\n---\n\n{prompt}"
 
-    # Determine provider
-    provider = provider_override or substitute_variables(step.provider, variables, warn_non_scalar=verbose)
+    # Structured or plain-text
 
     # Plain text mode - bypass structured output
     if step.plain_text: