fix(review-suite): mark example verification commands as placeholders; pin variable description and prompt note

Adversary re-review follow-ups to 665fee9/402d25a:

- architect/sisyphus spawn templates: the pinned cargo commands are only an
  EXAMPLE in a language-agnostic orchestrator — a literal follower in a
  non-Rust repo would record 'cargo: command not found' and yield a false
  DIVERGES. Each --variables line now carries a substitution cue (pinned).
- run_checks.py: a non-list prior pipeline_faults value is no longer iterated
  character by character (test case added).
- Pins: both graphs' verification_commands description wording; the
  run_adversary prompt states where the commands come from; the replacement
  sentence sits on one physical line.

assets/agents/adversary/scripts/run_checks.py

@@ -147,7 +147,8 @@ def main():
         cmds = declared_commands(state.get("verification_commands"))
     except InvalidDeclaration as e:
         msg = f"PIPELINE-FAULT: verification_commands declaration invalid — {e}"
-        faults = [f for f in (state.get("pipeline_faults") or []) if isinstance(f, str)]
+        prior = state.get("pipeline_faults")
+        faults = [f for f in prior if isinstance(f, str)] if isinstance(prior, list) else []
         faults.append(msg)
         print(json.dumps({"exec_results": msg, "pipeline_faults": faults}))
         return