feat(course): build out all 27 modules, capstone, scaffold, and conventions

Scaffold the course repo and author the full curriculum in dependency-chain
order, following the settled build decisions in handoff.md.

- Scaffold: course README, vendor-neutral AGENTS.md (dogfoods Module 5),
  _TEMPLATE.md (the fixed 9-section module shape), root .gitignore, ship config.
- Modules 1-2: reference exemplars (locked for tone/depth/lab style).
- Modules 3-27: full lessons + runnable labs, each following the template,
  respecting the chain, vendor/model-agnostic, with "feel the pain" labs.
- Module 8 hosting comparison web-researched and date-stamped (as of 2026-06-22),
  not written from memory; expansion-zone modules carry Verify-before-publish.
- Capstone: the full loop end to end on the running tasks-app example.

Lab code syntax-checked (Python/shell/YAML); every module has the 7 core
template sections.

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

modules/26-orchestrating-multiple-agents/lab/status.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+# Module 26 lab — fleet dashboard.
+#
+# Prints every worktree, its branch, and how much work is in flight (uncommitted changes +
+# commits ahead of main). Your "where is every agent?" view in one command. Run from anywhere
+# inside the repo.
+
+set -euo pipefail
+
+git rev-parse --git-dir >/dev/null 2>&1 || { echo "not a git repo" >&2; exit 1; }
+
+printf "%-32s %-22s %-10s %s\n" "WORKTREE" "BRANCH" "AHEAD" "DIRTY?"
+printf "%-32s %-22s %-10s %s\n" "--------" "------" "-----" "------"
+
+git worktree list --porcelain | awk '/^worktree /{wt=$2} /^branch /{print wt"\t"$2}' \
+| while IFS=$'\t' read -r wt ref; do
+    branch="${ref#refs/heads/}"
+    name="$(basename "$wt")"
+    # commits on this branch not yet in main
+    ahead="$(git -C "$wt" rev-list --count main.."$branch" 2>/dev/null || echo "?")"
+    # any uncommitted changes in this worktree?
+    if [ -n "$(git -C "$wt" status --porcelain 2>/dev/null)" ]; then dirty="yes"; else dirty="no"; fi
+    printf "%-32s %-22s %-10s %s\n" "$name" "$branch" "$ahead" "$dirty"
+done