chore: license Ekklesia under AGPL-3.0-or-later instead of AGPL-3.0-only

The project decision is the GNU Affero General Public License, version 3 or
(at your option) any later version.

- "license": "AGPL-3.0-or-later" in all 14 Ekklesia-owned package.json files.
- README: the License section states AGPL v3 or any later version (SPDX
  AGPL-3.0-or-later) and carries the FSF's standard grant: "either version 3 of
  the License, or (at your option) any later version", with its warranty
  disclaimer and pointer to the license.
- Module template README and module development guide: AGPL-3.0-or-later for
  Ekklesia and official modules.

LICENSE is unchanged: it remains the canonical AGPLv3 text.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

templates/module/README.md

@@ -84,7 +84,7 @@ classification or approval.
 
 ## License
 
-The template's `package.json` declares `"license": "AGPL-3.0-only"`, the license of Ekklesia and of
-official Ekklesia modules (see the repository [README](../../README.md#license) and
+The template's `package.json` declares `"license": "AGPL-3.0-or-later"`, the license of Ekklesia
+and of official Ekklesia modules (see the repository [README](../../README.md#license) and
 [LICENSE](../../LICENSE)). A module started from the template begins with that declaration; an
 official Ekklesia module keeps it.

templates/module/package.json

@@ -1,7 +1,7 @@
 {
   "name": "@ekklesia/module-template",
   "version": "0.1.0",
-  "license": "AGPL-3.0-only",
+  "license": "AGPL-3.0-or-later",
   "private": true,
   "type": "module",
   "files": [