diff --git a/.github/scripts/launch-smoke.sh b/.github/scripts/launch-smoke.sh
index 94f9bf8..38b624a 100644
--- a/.github/scripts/launch-smoke.sh
+++ b/.github/scripts/launch-smoke.sh
@@ -26,5 +26,28 @@ for attempt in 1 2 3; do
   sleep 5
 done
 
+# `adb install` returns when the install session commits, which is before the
+# package manager has the app indexed. Starting the activity in that window
+# fails with "Error type 3 / Activity class does not exist" -- the app is on
+# disk, the launcher just cannot see it yet. That failure looks identical to a
+# genuinely broken build, and it is what the job's reputation as a flake was
+# partly built on (#247, #252, #262).
+#
+# Wait for the package manager to answer instead of sleeping a fixed amount:
+# a slow CI emulator can take several seconds, a fast one none at all.
+echo "Waiting for the package manager to see the app"
+for _ in $(seq 1 30); do
+  if adb shell pm path com.markleaf.notes 2>/dev/null | tr -d '\r' | grep -q '^package:'; then
+    echo "Package indexed."
+    break
+  fi
+  sleep 2
+done
+
+if ! adb shell pm path com.markleaf.notes 2>/dev/null | tr -d '\r' | grep -q '^package:'; then
+  echo "Package manager never listed com.markleaf.notes after a successful install"
+  exit 1
+fi
+
 adb shell am start -W -n com.markleaf.notes/.MainActivity
 adb shell pidof com.markleaf.notes
diff --git a/.github/workflows/android-build.yml b/.github/workflows/android-build.yml
index 21a3c6b..2d80588 100644
--- a/.github/workflows/android-build.yml
+++ b/.github/workflows/android-build.yml
@@ -74,6 +74,10 @@ jobs:
             app/build/outputs/roborazzi/
             app/build/reports/roborazzi/
           if-no-files-found: ignore
+          # Only uploaded when the visual check fails, and only useful while
+          # someone is looking at that failure. A week outlives any run worth
+          # re-opening; the goldens themselves live in the repository (#247).
+          retention-days: 7
 
       - name: Run release lint (hard gate)
         run: ./gradlew :app:lintRelease
@@ -85,6 +89,9 @@ jobs:
           name: lint-report-release
           path: app/build/reports/lint-results-release.html
           if-no-files-found: ignore
+          # Same reasoning as the Roborazzi diffs: a failure-only report that is
+          # read while the failure is fresh, or not at all (#247).
+          retention-days: 7
 
       - name: Build release APK with R8 (hard gate, unsigned ok)
         run: ./gradlew :app:assembleRelease
@@ -245,6 +252,11 @@ jobs:
           name: roborazzi-goldens-linux
           path: app/src/test/snapshots/roborazzi/
           if-no-files-found: error
+          # Longer than the failure-only artifacts: this one is downloaded and
+          # committed by hand, so it has to survive the gap between dispatching
+          # the run and getting round to the commit. Still not 90 days — once
+          # committed the goldens are in the repository (#247).
+          retention-days: 30
 
   release:
     if: startsWith(github.ref, 'refs/tags/v')
diff --git a/docs/assets/README.md b/docs/assets/README.md
new file mode 100644
index 0000000..04dba72
--- /dev/null
+++ b/docs/assets/README.md
@@ -0,0 +1,52 @@
+# Public assets
+
+What each file here is for, and — for the ones recorded from a running build —
+which version they show. Two things went unrecorded before this file existed:
+why unreferenced files are kept, and how anyone would notice a clip has gone
+stale (#258).
+
+## Demo clips
+
+| File | Surface | Recorded on |
+|---|---|---|
+| `markleaf-tablet-<lang>.gif` (6) | Landing story 01 + README hero, one per language | v2.30.0 |
+| `markleaf-demo.gif` | Older single-language demo | v2.23.0 |
+
+`scripts/verify-landing-versions.ps1` asserts that each language surface points
+at its **own** clip and that the file exists — a page referencing another
+language's GIF renders fine and would otherwise ship silently.
+
+Nothing asserts that a clip still matches the current UI. That is a judgement
+call, not a check: re-record when a change would make the clip misleading, and
+update the version above when you do. A clip showing an older layout is only a
+problem once the layout it shows is gone.
+
+## Screenshots
+
+`markleaf-editor-*.webp`, `markleaf-privacy-*.webp`, `markleaf-tags-*.webp` —
+the landing page screenshots, in 720px and 1280px variants. The version they
+show is carried in each page's `<figcaption>`, which
+`verify-landing-versions.ps1` requires to agree across the six languages.
+
+### `markleaf-preview-720.webp` / `markleaf-preview-1280.webp` — kept deliberately
+
+**Nothing in this repository references these two.** They are kept anyway, and
+this is the record of that decision so a future cleanup does not have to guess.
+
+They were served from GitHub Pages under stable URLs
+(`https://jeiel85.github.io/markleaf-android/assets/markleaf-preview-1280.webp`)
+while they were in use, and those URLs may be linked from places outside this
+repository — a store listing draft, a forum post, a bookmark. Deleting the
+files breaks those links for no benefit: together they are ~93 KB and cost
+nothing to keep.
+
+Remove them only if the Pages site itself moves or is retired, which breaks the
+URLs regardless.
+
+## Store and brand
+
+| File | Use |
+|---|---|
+| `markleaf-feature-graphic-1024x500.png` | Play Console feature graphic |
+| `markleaf-playstore-icon-512.png` | Play Console app icon |
+| `logo.svg` | Landing header |
diff --git a/scripts/verify-landing-versions.ps1 b/scripts/verify-landing-versions.ps1
index a352c2b..6bab429 100644
--- a/scripts/verify-landing-versions.ps1
+++ b/scripts/verify-landing-versions.ps1
@@ -149,6 +149,57 @@ foreach ($file in $readmeFiles) {
     }
 }
 
+# ---- 언어별 데모 GIF: 각 페이지가 자기 언어 클립을 가리키는지 ----
+#
+# README.ko.md 가 markleaf-tablet-en.gif 를 가리켜도 렌더링은 멀쩡하므로 조용히
+# 나간다 — 버전 표기에서 이 검사가 막아 주는 것과 같은 종류의 구멍이다 (#258).
+# 언어 코드는 파일명 규칙에서 끌어온다: index.html/README.md 는 en, 나머지는 접미사.
+$assetPairs = @(
+    @{ File = "docs/index.html";  Lang = "en" }
+    @{ File = "docs/index.ko.html"; Lang = "ko" }
+    @{ File = "docs/index.ja.html"; Lang = "ja" }
+    @{ File = "docs/index.de.html"; Lang = "de" }
+    @{ File = "docs/index.es.html"; Lang = "es" }
+    @{ File = "docs/index.fr.html"; Lang = "fr" }
+    @{ File = "README.md";    Lang = "en" }
+    @{ File = "README.ko.md"; Lang = "ko" }
+    @{ File = "README.ja.md"; Lang = "ja" }
+    @{ File = "README.de.md"; Lang = "de" }
+    @{ File = "README.es.md"; Lang = "es" }
+    @{ File = "README.fr.md"; Lang = "fr" }
+)
+
+Write-Host "`n데모 GIF ($($assetPairs.Count)개 표면)"
+foreach ($pair in $assetPairs) {
+    $path = Resolve-UnderRoot $pair.File
+    if (-not (Test-Path -LiteralPath $path)) {
+        Add-Failure ("  FAIL  {0,-20} 파일이 없습니다." -f $pair.File)
+        continue
+    }
+    $text = Get-Content -Raw -Encoding utf8 -LiteralPath $path
+    $expected = "markleaf-tablet-$($pair.Lang).gif"
+
+    # 이 표면이 참조하는 태블릿 GIF 를 전부 모아, 자기 언어 것만 있는지 본다.
+    $referenced = @(
+        [regex]::Matches($text, 'markleaf-tablet-([a-z]{2})\.gif') |
+            ForEach-Object { $_.Value } | Sort-Object -Unique
+    )
+
+    if ($referenced.Count -eq 0) {
+        Add-Failure ("  FAIL  {0,-20} 태블릿 데모 GIF 참조가 없습니다 (기대 {1})." -f $pair.File, $expected)
+    } elseif ($referenced -contains $expected -and $referenced.Count -eq 1) {
+        # 에셋 자체가 있어야 참조가 의미를 갖는다.
+        $assetPath = Join-Path $docsPath "assets/$expected"
+        if (Test-Path -LiteralPath $assetPath) {
+            Write-Host ("  OK    {0,-20} {1}" -f $pair.File, $expected) -ForegroundColor Green
+        } else {
+            Add-Failure ("  FAIL  {0,-20} {1} 을 가리키는데 docs/assets 에 그 파일이 없습니다." -f $pair.File, $expected)
+        }
+    } else {
+        Add-Failure ("  FAIL  {0,-20} 기대 {1}, 실제 -> {2}" -f $pair.File, $expected, ($referenced -join ', '))
+    }
+}
+
 # ---- 스크린샷(figcaption): 릴리스 버전과 별개, 언어 간 일치만 확인 ----
 $screenshotUnique = @($screenshotVersions | Sort-Object -Unique)
 if ($screenshotUnique.Count -le 1) {