diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 16dc0a1..2ddd5b8 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -43,3 +43,19 @@ jobs:
     steps:
       - id: deployment
         uses: actions/deploy-pages@cd2ce8fcbc39b97be8ca5fce6e763baed58fa128 # v5.0.0
+      # A green deploy is not proof the site serves what we built: #110 shipped a "successful"
+      # deploy whose artifact silently omitted .well-known/, and only a manual curl caught it.
+      # Fail the run instead, on the canonical host the Worker actually fronts.
+      - name: smoke — the canonical URLs answer
+        run: |
+          set -uo pipefail
+          fail=0
+          for path in / /feed.xml /.well-known/security.txt /.well-known/pgp-security.asc; do
+            # -f makes a 4xx an error so --retry-all-errors keeps trying: the Worker caches its
+            # own 404 for 60s, so the first probe after a deploy can legitimately still miss.
+            code=$(curl -fsS -L -o /dev/null -w '%{http_code}' \
+              --retry 10 --retry-delay 10 --retry-all-errors \
+              "https://material-identity.eu${path}") || { code="${code:-000} FAILED"; fail=1; }
+            printf '%-34s %s\n' "$path" "$code"
+          done
+          exit $fail
diff --git a/CLAUDE.md b/CLAUDE.md
index 7fbd7af..dd53d9b 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -116,7 +116,10 @@ section for the full explanation).
   code): `pgp-security.asc` (public key only — never a private one) and `security.txt`
   (RFC 9116). The worker types them and caps their cache at a day. An unnumbered validate check
   fails the build when `Expires` is missing, past, or over a year out — renew it in place, it is
-  not under `published/`
+  not under `published/`. **Nothing emitted into `site/` may start with a dot**:
+  `upload-pages-artifact` tars with `--exclude=.[^/]*`, so the build writes `site/well-known/`
+  and the Worker rewrites `/.well-known/<x>` onto it (#110). A build test asserts the site is
+  dot-free, and `deploy.yml` smoke-tests the live URLs — a green deploy alone proved nothing
 - `REVIEW.md` — what reviewers check beyond CI; read it before reviewing any publish PR
 - `standards/` — local-only licensed docs; only its README is committed
 
diff --git a/scripts/build.ts b/scripts/build.ts
index c28a6d2..7a4b5ca 100644
--- a/scripts/build.ts
+++ b/scripts/build.ts
@@ -21,6 +21,10 @@ const SCHEMA_PATH = join(LIB_DIR, '..', 'schema', 'dictionary-entry.schema.json'
 const CONTEXT_PATH = join(LIB_DIR, '..', 'rdf', 'context.jsonld');
 // RFC 8615 well-known URIs, copied wholesale so adding e.g. a security.txt needs no code (#107).
 const WELL_KNOWN_PATH = join(LIB_DIR, '..', '.well-known');
+// ...but emitted WITHOUT the dot (#110): actions/upload-pages-artifact tars with
+// `--exclude=.[^/]*`, so a site/.well-known/ is silently dropped and the URL 404s in production.
+// The Worker maps the canonical /.well-known/<x> onto this path; the origin is never advertised.
+const WELL_KNOWN_OUT = 'well-known';
 
 export interface BuildResult {
   entries: number;
@@ -74,7 +78,7 @@ export function build(root: string, out: string): BuildResult {
   // RDF track steps 1–2 (issue #98): the context is the semantic commitment, the Turtle is a
   // derived second serialization. The canonical /def/<uuid>.json is untouched by both.
   cpSync(CONTEXT_PATH, join(out, 'context.jsonld'));
-  if (existsSync(WELL_KNOWN_PATH)) cpSync(WELL_KNOWN_PATH, join(out, '.well-known'), { recursive: true });
+  if (existsSync(WELL_KNOWN_PATH)) cpSync(WELL_KNOWN_PATH, join(out, WELL_KNOWN_OUT), { recursive: true });
   const issued = new Map([...releases].map(([path, release]) => [path, release.date]));
   writeFileSync(join(out, 'dictionary.ttl'), renderTurtle(repo, refs, issued));
   return { entries, out };
diff --git a/test/build.test.ts b/test/build.test.ts
index d23732e..8d1dc91 100644
--- a/test/build.test.ts
+++ b/test/build.test.ts
@@ -332,20 +332,25 @@ test('build publishes the JSON-LD context and the Turtle graph, and the entry JS
   }
 });
 
-test('the tracked .well-known directory is copied into the site byte-for-byte (#107, #109)', () => {
+test('the tracked .well-known directory is copied into the site byte-for-byte (#107, #109, #110)', () => {
   const out = buildGreen();
   try {
     const source = readFileSync(join(here, '..', '.well-known', 'pgp-security.asc'));
-    assert.deepEqual(readFileSync(join(out, '.well-known', 'pgp-security.asc')), source);
+    assert.deepEqual(readFileSync(join(out, 'well-known', 'pgp-security.asc')), source);
     // a public key block, never a private one
     const text = source.toString('utf8');
     assert.match(text, /^-----BEGIN PGP PUBLIC KEY BLOCK-----/);
     assert.ok(!text.includes('PRIVATE KEY'), 'a private key must never be published');
 
     // security.txt rides along on the same wholesale copy, no builder code of its own
-    const sec = readFileSync(join(out, '.well-known', 'security.txt'), 'utf8');
+    const sec = readFileSync(join(out, 'well-known', 'security.txt'), 'utf8');
     assert.deepEqual(sec, readFileSync(join(here, '..', '.well-known', 'security.txt'), 'utf8'));
     assert.match(sec, /^Canonical: https:\/\/material-identity\.eu\/\.well-known\/security\.txt$/m);
+
+    // Nothing in the emitted site may start with a dot: actions/upload-pages-artifact tars with
+    // `--exclude=.[^/]*`, so a dot-entry deploys as a 404 while every other test stays green (#110).
+    const dotted = readdirSync(out, { recursive: true, encoding: 'utf8' }).filter((p) => /(^|\/)\./.test(p));
+    assert.deepEqual(dotted, [], `these would be stripped from the Pages artifact: ${dotted.join(', ')}`);
   } finally {
     rmSync(out, { recursive: true, force: true });
   }
diff --git a/test/index-worker.test.ts b/test/index-worker.test.ts
index 6cca10f..2575e12 100644
--- a/test/index-worker.test.ts
+++ b/test/index-worker.test.ts
@@ -98,7 +98,8 @@ test('decide: JSON is the default; HTML only when Accept names text/html', () =>
 
 test('decide: well-known URIs are typed and cached for a day, never immutable (#107, #109)', () => {
   const key = decide('/.well-known/pgp-security.asc', '*/*');
-  assert.equal(key.originPath, '/.well-known/pgp-security.asc');
+  // undotted at the origin — the Pages artifact tar drops dot-directories (#110)
+  assert.equal(key.originPath, '/well-known/pgp-security.asc');
   assert.equal(key.headers['content-type'], 'application/pgp-keys');
   // a key can be rotated or revoked, so it must never inherit an entry's immutable caching
   assert.equal(key.headers['cache-control'], 'public, max-age=86400');
@@ -106,15 +107,21 @@ test('decide: well-known URIs are typed and cached for a day, never immutable (#
 
   // RFC 9116 §3 requires security.txt to be served as text/plain with a charset
   const sec = decide('/.well-known/security.txt', '*/*');
-  assert.equal(sec.originPath, '/.well-known/security.txt');
+  assert.equal(sec.originPath, '/well-known/security.txt');
   assert.equal(sec.headers['content-type'], 'text/plain; charset=utf-8');
   assert.equal(sec.headers['cache-control'], 'public, max-age=86400');
 
-  // anything else well-known gets the ceiling and the origin's own type
+  // anything else well-known gets the ceiling and the origin's own type, nested paths included
   const other = decide('/.well-known/openpgpkey/hu/abc', '*/*');
+  assert.equal(other.originPath, '/well-known/openpgpkey/hu/abc');
   assert.equal(other.headers['cache-control'], 'public, max-age=86400');
   assert.equal(other.headers['content-type'], undefined);
 
+  // no origin path we serve may start with a dot, or the artifact tar drops it again (#110)
+  for (const p of ['/.well-known/security.txt', '/.well-known/pgp-security.asc', '/.well-known/a/b']) {
+    assert.ok(!decide(p, '*/*').originPath.includes('/.'), `${p} must not map to a dot-directory`);
+  }
+
   // .asc / .txt anywhere else are not special-cased
   assert.equal(decide('/def/whatever.asc', '*/*').headers['content-type'], undefined);
   assert.equal(decide('/robots.txt', '*/*').headers['content-type'], undefined);
diff --git a/worker/index.ts b/worker/index.ts
index d58b967..47ff4a2 100644
--- a/worker/index.ts
+++ b/worker/index.ts
@@ -29,11 +29,16 @@ export function decide(pathname: string, accept: string | null): RouteDecision {
   // RFC 8615 well-known URIs (#107, #109). Cacheable but never immutable like an entry: a key can
   // be rotated or revoked and security.txt expires, so a day is the ceiling. Pages would serve
   // .asc as a generic byte stream and .txt without a charset, hence the explicit types.
+  //
+  // The origin stores these under `well-known/`, undotted (#110): actions/upload-pages-artifact
+  // tars with `--exclude=.[^/]*` and silently drops any dot-directory, which 404'd the live URL
+  // while every local test passed. Rewriting here keeps the canonical, RFC-mandated URL intact —
+  // mapping a URI onto an origin file is this Worker's whole job.
   if (pathname.startsWith('/.well-known/')) {
     const headers: Record<string, string> = { 'cache-control': 'public, max-age=86400' };
     if (pathname.endsWith('.asc')) headers['content-type'] = 'application/pgp-keys';
     if (pathname.endsWith('.txt')) headers['content-type'] = 'text/plain; charset=utf-8'; // RFC 9116 §3
-    return { originPath: pathname, headers };
+    return { originPath: `/well-known/${pathname.slice('/.well-known/'.length)}`, headers };
   }
 
   // index, pagination, styles, raw origin files: pass through with a short cache