escala 2+3: Meteor 1.8.3 -> 2.3 (Mongo 3.2 compatible), dead-package remediation

Reaches Meteor 2.3 building + running against Mongo 3.2, REST smoke test
byte-identical to the 1.6.1.1 baseline (all 12 Flutter endpoints green).

Dead/abandoned Atmosphere packages removed or replaced (the upgrade blockers):
- arkham:comments-ui (no Meteor 2.x build; pinned accounts-password@1.x):
  reimplemented the fire-page comments as a React feature:
    imports/api/Comments/ (collection, server methods, publication, media
    analyzers, new-fire-comment email) + imports/ui/components/Comments/CommentsBox.
    Comment text now rendered as safe plain text + image/youtube embed (was
    markdown-to-HTML). Wired into Fires.js; sitemaps.js + migration v11 updated
    to the new collection. Old Blaze/startup comments files deleted.
- nimble:restivus (REST API; pinned accounts-password@1.3.3, CoffeeScript source
  that crashes this build host): vendored as a local package
  packages/nimble-restivus with the .coffee precompiled to plain JS and the
  accounts-password constraint loosened to 2.x. REST behavior unchanged
  (verified by smoke test). This also dropped the entire iron:router stack.
- maximum:server-transform (+ peerlibrary:*, meteorhacks:zones/inject-initial):
  unused; removal broke Meteor.publishTransformed in FalsePositives publications
  -> replaced with plain Meteor.publish (no transform was configured).
- less, markdown (no source files), and the dead test stack
  (meteortesting:mocha, practicalmeteor:chai, xolvio:cleaner) which transitively
  pulled coffeescript@1.0.17 — the build plugin that crashed meteor-tool
  (node_contextify assertion) on this machine. Removing it unblocked the build.
- fourseven:scss 4.5.4 -> 4.14.1 (node-sass 4.5.3 doesn't build on node 12).

npm-mongo driver at 2.3 is 3.9.x — still compatible with the production Mongo
3.2 replica set.

imports/api/Comments/server/onCommentAdd.js

@@ -0,0 +1,42 @@
+/* eslint-disable import/no-absolute-path */
+import { Meteor } from 'meteor/meteor';
+import i18n from 'i18next';
+import sendEmail, { subjectTruncate } from '/imports/modules/server/send-email';
+import getEmailOf from '/imports/modules/get-email-of-user';
+import Comments from '/imports/api/Comments/Comments';
+
+/*
+ * When a comment is added to a fire, email the other users who commented on the
+ * same fire (uniq, excluding the author). Ported from the old
+ * startup/server/comments.js `onEvent` handler.
+ */
+export default function onCommentAdd(payload) {
+  const { referenceId, userId } = payload;
+  const query = { referenceId, userId: { $ne: userId } };
+
+  Comments.rawCollection().distinct('userId', query).then((users) => {
+    const path = referenceId.replace(/fire-/, 'fire/archive/');
+    const fireUrl = Meteor.absoluteUrl(path);
+    Meteor.users.find({ _id: { $in: users } }).forEach((user) => {
+      const { firstName, emailAddress } = getEmailOf(user);
+      if (emailAddress) {
+        const emailOpts = {
+          to: emailAddress,
+          subject: subjectTruncate.apply(i18n.t('Hay más información sobre un fuego')),
+          lang: user.lang,
+          template: 'new-fire-comment',
+          templateVars: {
+            applicationName: i18n.t('AppName'),
+            firstName,
+            fireUrl
+          }
+        };
+        sendEmail(emailOpts).catch((error) => {
+          console.warn(`comments new-fire-comment mail failed: ${error}`);
+        });
+      }
+    });
+  }).catch((error) => {
+    console.warn(`comments distinct() failed: ${error}`);
+  });
+}