Add npm backfill pipeline, shared htpasswd registry auth docs

- drone npm template gains backfill-npm-from-tags (mirrors PyPI)
- document the shared /auth/htpasswd credential model (npm + PyPI +
  docker) and Verdaccio's bcrypt requirement
- point doc-weaver source/path at ../react/doc-weaver

standards/lib/90_drone_pipelines/index.html

@@ -733,18 +733,25 @@ with <code>from_secret</code> — never commit credentials.</p>
 </ul>
 <hr />
 <h2 id="type-b-npm-package-npm-libyaml">Type B — npm package (<code>npm-lib.yaml</code>)</h2>
-<p>For internal npm libraries (the React packages). One pipeline,
-<strong><code>build-and-publish-npm</code></strong>, triggered on <code>tag</code>:</p>
-<ul>
+<p>For internal npm libraries (the React packages). The file contains <strong>two
+pipelines</strong>:</p>
+<ol>
+<li><strong><code>build-and-publish-npm</code></strong> — triggered on <code>tag</code>:</li>
 <li><code>check-version</code> — <strong>guard</strong>: fail unless <code>$DRONE_TAG</code> equals the version in
-  <code>package.json</code>; query <code>$NPM_REPO_URL</code> for <code>name@version</code>; if it already
-  exists, exit <code>78</code> and skip the whole build.</li>
+     <code>package.json</code>; query <code>$NPM_REPO_URL</code> for <code>name@version</code>; if it already
+     exists, exit <code>78</code> and skip the whole build.</li>
 <li><code>quality-gate</code> — write <code>.npmrc</code> from the secrets, <code>npm install</code>, then
-  <code>npm run quality-gate</code>.</li>
+     <code>npm run quality-gate</code>.</li>
 <li><code>build-package</code> — <code>npm install &amp;&amp; npm run build</code> into <code>dist/</code>.</li>
 <li><code>publish-to-private-npm</code> — <code>npm publish --access restricted</code> to
-  <code>$NPM_REPO_URL</code>.</li>
-</ul>
+     <code>$NPM_REPO_URL</code>.</li>
+<li><strong><code>backfill-npm-from-tags</code></strong> — triggered on <code>custom</code>:</li>
+<li><code>fetch-tags</code> — <code>git fetch --tags --force</code>.</li>
+<li><code>build-and-publish-missing</code> — walk every tag in version order, skip the
+     ones already on the registry, <code>git checkout</code> the rest, verify
+     <code>tag == package.json version</code> at that commit, build, and publish. This is
+     the disaster-recovery / replay path.</li>
+</ol>
 <p>Secrets: <code>NPM_REPO_URL</code>, <code>NPM_USERNAME</code>, <code>NPM_PASSWORD</code>. Auth is a generated
 <code>.npmrc</code> (<code>registry=</code> + <code>_auth=</code> base64 of <code>user:pass</code>) written from secrets at
 runtime — the committed <code>.npmrc</code> in a repo only points at the registry URL.</p>
@@ -752,6 +759,16 @@ runtime — the committed <code>.npmrc</code> in a repo only points at the regis
 <li><strong>Ship as-is.</strong> Name and version come from <code>package.json</code>, so the same file
   is reused verbatim across every npm package.</li>
 </ul>
+<blockquote>
+<p><strong>Registry credentials are shared.</strong> The private npm registry (Verdaccio at
+<code>npm.aetoskia.com</code>) authenticates against the <strong>same <code>htpasswd</code> file</strong> as the
+private PyPI index and the Docker registry (<code>/auth/htpasswd</code>), with
+registration disabled (<code>max_users: -1</code>). <code>NPM_USERNAME</code> / <code>NPM_PASSWORD</code> are
+therefore the <strong>same credentials as <code>PIP_USERNAME</code> / <code>PIP_PASSWORD</code></strong> — no
+separate npm account exists. Verdaccio's htpasswd plugin accepts <strong>bcrypt</strong>
+hashes (<code>$2y$…</code>); non-bcrypt entries that pypiserver tolerates will not
+authenticate against npm. See <a href="../93_library_registry/">93 – Library Registry</a>.</p>
+</blockquote>
 <hr />
 <h2 id="type-c-docker-deployment-service-dockeryaml">Type C — Docker deployment (<code>service-docker.yaml</code>)</h2>
 <p>For a service that ships a container image — a long-running API/worker, e.g.
@@ -821,8 +838,8 @@ triggered on <code>tag</code>:</p>
   <code>package.json</code> version; a service needs a root <code>VERSION</code> file. See
   <a href="../91_versioning_and_changelog/">91 – Versioning &amp; Changelog</a>.</li>
 <li>Do not rename the pipelines; tooling and runbooks key off
-  <code>build-and-publish-pypi</code>, <code>build-and-publish-npm</code>, and
-  <code>build-and-deploy-service</code>.</li>
+  <code>build-and-publish-pypi</code>, <code>build-and-publish-npm</code>,
+  <code>build-and-deploy-service</code>, and their <code>backfill-*-from-tags</code> companions.</li>
 </ul>
 <hr />
 <h2 id="related">Related</h2>