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/issue-delete-command.md

@@ -1,6 +1,6 @@
 <!--
   The agent's INPUT for Module 25. This is a well-formed issue in the Module 9 format: title,
-  context, acceptance criteria, scope. It is deliberately a good candidate for an agent — well-
+  context, acceptance criteria, scope. It is deliberately a good candidate for an agent: well-
   scoped, concrete, and it mirrors a pattern already in the codebase (the existing `done` command).
 
   The orchestrator (agent_runner.py) reads this file and pairs it with your committed AI config
@@ -15,7 +15,7 @@
 
 `tasks-app` can `add`, `list`, and mark a task `done`, but there's no way to remove a task. Once a
 task is added by mistake it stays forever. The `done` command already takes an index and mutates the
-list through a method on `TaskList`, so a `delete` command should follow the exact same shape — this
+list through a method on `TaskList`, so a `delete` command should follow the exact same shape. This
 is a patterned change, not a design problem.
 
 ## Acceptance criteria
@@ -25,7 +25,7 @@ is a patterned change, not a design problem.
 - `delete` with an out-of-range or non-integer index prints a clear error (e.g.
   `no task at index 99`) and exits non-zero, instead of dumping a traceback.
 - The logic lives on `TaskList` (a `remove(index)` method or equivalent), mirroring how `complete`
-  works — `cli.py` only parses arguments and calls it.
+  works; `cli.py` only parses arguments and calls it.
 - A test covers: a successful delete removes the right task, and an out-of-range delete is handled.
 
 ## Out of scope