Use python3 as the canonical command name course-wide (#104) (#105)

modules/25-autonomous-agents/lab/agent_runner.py

@@ -14,10 +14,10 @@ not a human watching it type.
 Run it two ways:
 
   1. Simulated (no agent needed, fully deterministic); see the machinery and the gates:
-         python agent_runner.py issue-to-pr issue-delete-command.md --simulate good
-         python agent_runner.py issue-to-pr issue-delete-command.md --simulate bad
-         python agent_runner.py self-heal --simulate bad
-         python agent_runner.py self-heal --simulate stuck
+         python3 agent_runner.py issue-to-pr issue-delete-command.md --simulate good
+         python3 agent_runner.py issue-to-pr issue-delete-command.md --simulate bad
+         python3 agent_runner.py self-heal --simulate bad
+         python3 agent_runner.py self-heal --simulate stuck
 
      Simulation works on a SELF-CONTAINED demo target (agent_demo.py + test_agent_demo.py) so it is
      deterministic and never corrupts your real tasks-app files. The gate it runs (ruff + pytest) is
@@ -26,7 +26,7 @@ Run it two ways:
   2. Real agent: drives your own agentic tool against the actual issue. Point AGENT_CMD at your
      tool's non-interactive / one-shot mode, then drop --simulate:
          export AGENT_CMD='your-agent-cli --print --prompt-file {prompt_file}'
-         python agent_runner.py issue-to-pr issue-delete-command.md
+         python3 agent_runner.py issue-to-pr issue-delete-command.md
 
 Language: Python 3.10+. Standard library only.
 """