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/05-commit-the-ai-config/lab/instructions-file-starter.md

@@ -3,7 +3,7 @@
 
   Copy this to whatever filename YOUR agentic tool reads for repo-level instructions (check its
   docs), place it at the repo root, then edit every line to match reality. Wrong instructions are
-  worse than none — read it through before you commit it. Delete this comment when you're done.
+  worse than none; read it through before you commit it. Delete this comment when you're done.
 
   The shape below is deliberately short. An instructions file is a briefing for an agent that will
   edit this code, not documentation for humans (that's the README). Keep only lines that change the
@@ -13,15 +13,15 @@
 # Instructions for AI agents working on tasks-app
 
 A tiny command-line task tracker. The point of this project is to be small enough to read in a
-minute but real enough to have more than one file. Keep it that way — don't grow it into a product.
+minute but real enough to have more than one file. Keep it that way; don't grow it into a product.
 
 ## Project layout
 
-- `tasks.py` — core logic (`Task`, `TaskList`). New behavior that isn't about the command line goes
+- `tasks.py`: core logic (`Task`, `TaskList`). New behavior that isn't about the command line goes
   here.
-- `cli.py` — the command-line front end. Argument parsing and printing only; it calls into
+- `cli.py`: the command-line front end. Argument parsing and printing only; it calls into
   `tasks.py`. Reads and writes `tasks.json`.
-- `tasks.json` — generated state. See "Don't touch" below.
+- `tasks.json`: generated state. See "Don't touch" below.
 
 ## Build and test commands
 
@@ -31,7 +31,7 @@ minute but real enough to have more than one file. Keep it that way — don't gr
 
 ## Coding standards
 
-- Python 3.10+ . Standard library only — no third-party packages without being asked.
+- Python 3.10+ . Standard library only; no third-party packages without being asked.
 - Type-hint public functions and methods. Match the existing dataclass style in `tasks.py`.
 - Handle bad input gracefully (e.g. a non-numeric index) rather than letting a raw traceback escape.