Build out all 27 modules + capstone (#1)

Co-authored-by: claude <claude@jpaul.io>
Co-committed-by: claude <claude@jpaul.io>

modules/12-revert-reset-and-recovery/lab/bad-clear-snippet.py

@@ -0,0 +1,19 @@
+# Module 12 lab — the deliberately BROKEN `clear` command.
+#
+# Paste the elif block below into cli.py's main(), alongside the other
+# `elif command == "..."` branches (e.g. right after the "done" branch).
+# Do NOT paste this header or the import line into cli.py if json is already
+# imported there (it is) — just the elif block.
+#
+# Why it's broken: it "works" once (prints a friendly message), but it writes
+# the state file in the WRONG SHAPE. The next time the app loads tasks.json,
+# load() tries to build Task(**t) from a plain string and crashes. Classic
+# AI plausibility trap: reviews fine, runs fine once, breaks the next command.
+#
+# This exists so the lab's bad merge is deterministic across every learner.
+
+    elif command == "clear":
+        # BAD on purpose: dumps a bare string list instead of a list of task
+        # dicts, so the next load() -> Task(**t) blows up with a TypeError.
+        STATE.write_text(json.dumps(["cleared"]))
+        print("cleared all tasks")