Merge main (PRs #5, #7, #9, #10) into the PCO Plan branch

Resolves the admin form conflicts in favour of this branch's grouped /
collapsible / dependent-select additions (the base hunks were the timers
lane's, ported verbatim), keeps both sides of the README and module-guide
edits, and adopts main's versioning rules: the shell moves to 1.3.0 for the
new schema features (configGroups / instanceGroups, help, color fields,
grouped and dependent selects) and pco-plan 1.3.0 declares
"proddash": ">=1.3.0".

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

package.json

@@ -0,0 +1,13 @@
+{
+  "name": "proddash",
+  "version": "1.3.0",
+  "private": true,
+  "description": "Modular production dashboard for Waters Church — zero-dependency Node server + vanilla client",
+  "license": "UNLICENSED",
+  "engines": {
+    "node": ">=18"
+  },
+  "scripts": {
+    "start": "node server.js"
+  }
+}