Build out all 27 modules + capstone (#1)

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

modules/07-worktrees-running-agents-in-parallel/lab/cleanup-worktrees.sh

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+#!/usr/bin/env bash
+#
+# Module 7 lab — tear down the two worktrees created by setup-worktrees.sh.
+# Run from INSIDE your tasks-app repo:
+#
+#     bash modules/07-worktrees-running-agents-in-parallel/lab/cleanup-worktrees.sh
+#
+# `git worktree remove` deletes the folder AND clears Git's record of it; `prune` mops up any
+# worktrees whose folders were deleted by hand (which leaves a stale record otherwise).
+#
+# NOTE: --force discards UNCOMMITTED work in a worktree. Commit (or merge) before cleaning up.
+# This script assumes you already merged feature/clear and feature/count back into main.
+#
+set -euo pipefail
+
+ROOT="$(git rev-parse --show-toplevel)"
+PARENT="$(cd "$ROOT/.." && pwd)"
+
+git worktree remove "$PARENT/tasks-app-clear" --force 2>/dev/null || true
+git worktree remove "$PARENT/tasks-app-count" --force 2>/dev/null || true
+git worktree prune
+
+echo
+echo "Cleanup done. Remaining worktrees:"
+git worktree list
+
+echo
+echo "If you merged both branches you can also delete them:"
+echo "    git branch -d feature/clear feature/count"