style(no-slop): remove every em-dash + banned words across all modules + capstone

Apply the no-ai-slop standard (now binding in AGENTS.md): the em-dash character is
banned outright (restructured, not blind-replaced), plus the banned word/phrase
list (delve, leverage, robust, seamless, truly, unlock, etc.). 0 em-dashes remain
in modules + capstone; the only "robust" left is the planted M10 ai-change.patch
trap. Module H1 titles use a colon separator.

All deliberate teaching devices preserved; labs compile/parse (py/sh/yaml/json);
no junk. AGENTS.md updated with the hard no-slop rules.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TfzV5QvtPDz8LJS3Pu5VLT

modules/25-autonomous-agents/lab/.gitignore

@@ -1,17 +1,17 @@
 # Keep the agent's proposed diff clean (Module 25, Part B).
 #
-# propose_pr() in agent_runner.py runs `git add -A` on purpose — a real agent (Part D) may touch
+# propose_pr() in agent_runner.py runs `git add -A` on purpose; a real agent (Part D) may touch
 # files you can't enumerate ahead of time, so staging everything is the correct behavior. This
 # .gitignore is what keeps that honest: it excludes the Python caches and the lab scaffolding you
 # copied into tasks-app, so the commit the agent proposes is ONLY its real change (agent_demo.py and
-# its test in the simulated path) — not binary .pyc noise or the orchestrator itself.
+# its test in the simulated path), not binary .pyc noise or the orchestrator itself.
 
 # Python / tool caches
 __pycache__/
 .pytest_cache/
 .ruff_cache/
 
-# Lab scaffolding copied into tasks-app for this module — not part of the agent's change.
+# Lab scaffolding copied into tasks-app for this module, not part of the agent's change.
 agent_runner.py
 issue-delete-command.md
 agent-job.yml