diff --git a/.agents/skills/ci-and-devcontainer/SKILL.md b/.agents/skills/ci-and-devcontainer/SKILL.md
index ac61aac..9903452 100644
--- a/.agents/skills/ci-and-devcontainer/SKILL.md
+++ b/.agents/skills/ci-and-devcontainer/SKILL.md
@@ -33,12 +33,13 @@ description: Use when changing Rust toolchain setup, Linux GUI dependencies, CI,
     starts the container and runs its lifecycle commands, so a broken environment fails
     before merge.
   - Landing (`landing.yml`): on every push to main, or by hand, runs `just landing-build`
-    and deploys `apps/landing/dist` to GitHub Pages under `/study/`. A fresh checkout has
-    no captures of the app, so the recipe first makes all of them (`just docs-media`,
-    `just demo`) on the showcase's private desktop with software Vulkan, as the setup
-    action's extra packages provide, then builds the site with Bun, pinned by
-    `packageManager` in `apps/landing/package.json` to the Dockerfile's `BUN_VERSION`. The
-    README's demo GIF is published with the site; nothing it makes is committed.
+    and deploys `apps/landing/dist` to GitHub Pages under `/study/`. It builds no Rust: the
+    captures of the app are committed, and the site builds with Bun alone, pinned by
+    `packageManager` in `apps/landing/package.json` to the Dockerfile's `BUN_VERSION`.
+  - Captures (`captures.yml`): by hand only. Runs `just captures` on the showcase's private
+    desktop with software Vulkan, as the setup action's extra packages provide, and opens
+    (or updates) a pull request from the `captures` branch with what changed, then starts
+    CI on it, since a pull request a workflow opens starts none itself.
   - Releases: Linux x64 and ARM64 build inside the devcontainer; macOS Intel/Apple Silicon
     and Windows x64 use native GitHub runners. They install Rust and pinned cargo-packager;
     they must never require a second devcontainer.
diff --git a/.agents/team/roles/site.md b/.agents/team/roles/site.md
index 0f5e2f0..a5c2e12 100644
--- a/.agents/team/roles/site.md
+++ b/.agents/team/roles/site.md
@@ -35,8 +35,8 @@ Then update what they affect:
   name in both languages (`.mdx` when it shows captures, `.md` otherwise);
 - the captures of the app: scenes in `crates/study-showcase/src/docs.rs`, made by
   `just docs-media` into `apps/landing/src/assets/shots/` and `clips/` as
-  `{scene}-{en|it}-{light|dark}`. They are never committed; the Landing workflow makes them
-  again on every deploy, so change the scene, never the file.
+  `{scene}-{en|it}-{light|dark}`. They are committed, but only as the scene makes them: change
+  the scene and make them again, never edit the file.
 
 ## Rules
 
diff --git a/.github/workflows/captures.yml b/.github/workflows/captures.yml
new file mode 100644
index 0000000..b8b652d
--- /dev/null
+++ b/.github/workflows/captures.yml
@@ -0,0 +1,61 @@
+name: Captures
+
+# Makes every capture of the app the website shows again, from the code on the branch it runs
+# on: the docs' stills and clips and the README's demo GIF (`just captures`), on the
+# showcase's private desktop with software Vulkan. It takes a while, so it runs only by hand,
+# when the app's look has changed.
+#
+# What changed goes to a pull request from the `captures` branch, opened or updated here, to
+# look over and merge; nothing is pushed to main. A pull request a workflow opens starts no
+# workflow itself, so this starts CI on it.
+on:
+  workflow_dispatch:
+
+permissions:
+  contents: write
+  pull-requests: write
+  actions: write
+
+concurrency:
+  group: captures
+  cancel-in-progress: true
+
+jobs:
+  captures:
+    name: Make the captures
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Check out
+        uses: actions/checkout@v7
+      - name: Set up
+        uses: ./.github/actions/setup
+        with:
+          # The private headless desktop the showcase records on, with software Vulkan.
+          packages: >-
+            sway grim wtype wf-recorder ffmpeg
+            libvulkan1 mesa-vulkan-drivers libgl1-mesa-dri libegl-mesa0
+          # The app runs for real here, so it is built as in development.
+          optimize-dependencies: 'true'
+      - name: Capture the app
+        run: just captures
+      - name: Open a pull request
+        env:
+          GH_TOKEN: ${{ github.token }}
+          BASE: ${{ github.ref_name }}
+        run: |
+          git add --all apps/landing/src/assets/shots apps/landing/src/assets/clips apps/landing/public/demo.gif
+          if git diff --cached --quiet; then
+            echo "The captures are current."
+            exit 0
+          fi
+          git config user.name 'github-actions[bot]'
+          git config user.email '41898282+github-actions[bot]@users.noreply.github.com'
+          git switch -c captures
+          git commit -m "Make the website's captures again" -m "Made by the Captures workflow from $BASE at $GITHUB_SHA."
+          git push --force origin captures
+          if [ "$(gh pr view captures --json state -q .state 2>/dev/null)" != OPEN ]; then
+            gh pr create --base "$BASE" --head captures \
+              --title "Make the website's captures again" \
+              --body "The Captures workflow made every still, clip and the demo GIF again from \`$BASE\` at $GITHUB_SHA. Look them over before merging."
+          fi
+          gh workflow run ci.yml --ref captures
diff --git a/.github/workflows/landing.yml b/.github/workflows/landing.yml
index 57a24b0..810e040 100644
--- a/.github/workflows/landing.yml
+++ b/.github/workflows/landing.yml
@@ -3,10 +3,8 @@ name: Landing
 # Builds the website in apps/landing/ (Astro, static) and publishes it to GitHub Pages at
 # https://nicksan222.github.io/study/, so astro.config sets `base: '/study'`.
 #
-# Every capture of the app on the site is made here, from the code being deployed: the docs'
-# stills and clips (`just docs-media`) and the README's demo GIF (`just demo`), which the
-# site publishes at /study/demo.gif. None of them is committed, so any change to the app
-# runs this to keep them current.
+# It builds no Rust: the captures of the app the site shows are committed, so a deploy takes
+# about a minute. The Captures workflow makes them again, by hand, in a pull request.
 on:
   push:
     branches: [main]
@@ -27,21 +25,16 @@ jobs:
     steps:
       - name: Check out
         uses: actions/checkout@v7
-      - name: Set up
-        uses: ./.github/actions/setup
+      # The same pin as the setup action's, which this job does not otherwise need.
+      - name: Install just
+        uses: taiki-e/install-action@v2
         with:
-          # The private headless desktop the showcase records on, with software Vulkan.
-          packages: >-
-            sway grim wtype wf-recorder ffmpeg
-            libvulkan1 mesa-vulkan-drivers libgl1-mesa-dri libegl-mesa0
-          # The app runs for real here, so it is built as in development.
-          optimize-dependencies: 'true'
+          tool: just@1.40.0
       - name: Set up Bun
         uses: oven-sh/setup-bun@v2
         with:
           bun-version-file: apps/landing/package.json
-      # A fresh checkout has no captures, so this makes every one, then builds.
-      - name: Capture the app and build
+      - name: Build
         run: just landing-build
       - name: Upload
         uses: actions/upload-pages-artifact@v5
diff --git a/.gitignore b/.gitignore
index 88bfb18..68a71a3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -52,8 +52,3 @@ core.*
 /apps/landing/dist/
 /apps/landing/.astro/
 
-# Captures of the app, made from sample data on every website build (`just docs-media`,
-# `just demo`), never committed.
-/apps/landing/src/assets/shots/
-/apps/landing/src/assets/clips/
-/apps/landing/public/demo.gif
diff --git a/AGENTS.md b/AGENTS.md
index 40c0702..4edff1f 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -89,8 +89,9 @@ it and the app from zero, and `just desktop-watch` restarts the app on every cha
 - `just demo`: records the README's demo GIF from sample data on its own private desktop
   (no sign-in, no model, not the shared desktop), into `apps/landing/public/demo.gif`; the
   site publishes it and the README shows it from there. `just docs-media` makes the docs'
-  stills and clips the same way. None of them is committed: the Landing workflow makes all
-  of them on every deploy, and `just landing` makes any that are missing. Edit the tour in
+  stills and clips the same way, and `just captures` makes both. They are committed: the
+  website deploys them as they are, and the Captures workflow, run by hand, makes them all
+  again and opens a pull request with them. Edit the tour in
   `crates/study-showcase/src/tour.rs`, the docs' scenes in `src/docs.rs`.
 - `just agents`: maintainer tooling in the default devcontainer.
   Herdr runs one project-wide team: lead, developer, PM, QA, student, reviewer and pushback,
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 9243d78..2e47dc1 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -83,11 +83,12 @@ Both follow `XDG_DATA_HOME` and `XDG_CACHE_HOME`. `just run` uses `target/dev-da
 
 ## Captures of the app
 
-The README's demo GIF and every still and clip on the website are made from the code, never
-committed. The Landing workflow makes them all on every push to main, from sample data on a
-private virtual desktop, and publishes them with the site; the README shows the GIF from
-there. Locally, `just landing` and `just landing-build` make any that are missing, and
-`just docs-media` and `just demo` make them again after a change. Edit the GIF's tour in
+The README's demo GIF and every still and clip on the website are made from the code, on
+sample data on a private virtual desktop, and committed; the Landing workflow publishes them
+with the site as they are, and the README shows the GIF from there. When the app's look
+changes, run the Captures workflow by hand: it makes them all again and opens a pull request
+with them to look over and merge. Locally, `just captures` does the same, `just docs-media`
+and `just demo` make one kind, and `just docs-media missing` makes only a new scene's. Edit the GIF's tour in
 `crates/study-showcase/src/tour.rs` and the docs' scenes in `crates/study-showcase/src/docs.rs`.
 
 ## The agent team
diff --git a/Justfile b/Justfile
index 1c70ba2..2a9ee6a 100644
--- a/Justfile
+++ b/Justfile
@@ -168,22 +168,23 @@ demo output="apps/landing/public/demo.gif":
     cargo build --locked -p study
     cargo run --locked -p study-showcase -- "$1"
 
-# Make the website's docs stills and clips (apps/landing/src/assets/shots and clips) in every language and theme, the same way; name scenes or variants (`search it-dark`) to make only those, or `missing` for those not made yet.
+# Make the website's docs stills and clips (apps/landing/src/assets/shots and clips) in every language and theme, the same way; name scenes or variants (`search it-dark`) to make only those, or `missing` for those not made yet, as for a new scene.
 docs-media *only:
     cargo build --locked -p study
     cargo run --locked -p study-showcase -- docs {{only}}
 
-# Make the website's captures of the app that are missing: none is committed, so a fresh checkout (and every Landing workflow run) makes them all, and a new scene only its own. `just docs-media` and `just demo` make them again after a change.
-landing-media:
-    just docs-media missing
-    [ -s apps/landing/public/demo.gif ] || just demo
+# Make every capture of the app the website shows again, as the Captures workflow does: the docs' stills and clips, then the demo GIF. The old files go first, so a scene dropped from docs.rs leaves none behind.
+captures:
+    rm -f apps/landing/src/assets/shots/* apps/landing/src/assets/clips/*
+    just docs-media
+    just demo
 
 # Serve the website (apps/landing: the landing page and docs) with live reload at localhost:4321/study/.
-landing: landing-media
+landing:
     cd apps/landing && bun install --frozen-lockfile && bun run dev --host
 
-# Build the website into apps/landing/dist, as the Landing workflow publishes it, with every capture of the app.
-landing-build: landing-media
+# Build the website into apps/landing/dist, as the Landing workflow publishes it, from the committed captures; it fails if one is missing.
+landing-build:
     cd apps/landing && bun install --frozen-lockfile && bun run build
 
 # Type-check the website's pages, components and content without building it, so it needs no captures.
diff --git a/apps/landing/public/demo.gif b/apps/landing/public/demo.gif
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diff --git a/crates/study-showcase/src/desktop.rs b/crates/study-showcase/src/desktop.rs
index 13e1b6d..15857e7 100644
--- a/crates/study-showcase/src/desktop.rs
+++ b/crates/study-showcase/src/desktop.rs
@@ -435,10 +435,11 @@ impl Recording {
 
     /// Asks the recorder to finish the file and waits for it. A still screen sends the
     /// recorder no frame to notice the request on, so the pointer, resting at `at`, is
-    /// nudged until it ends and comes back there.
+    /// nudged until it ends and comes back there. On a small machine rendering in software
+    /// (a CI runner) it may still be encoding the frames it holds, so it gets a minute.
     pub fn stop(mut self, desktop: &Desktop, at: (u32, u32)) -> Result<()> {
         signal(&self.process.0, "INT").context("cannot stop wf-recorder")?;
-        let ended = wait(Duration::from_secs(10), "wf-recorder to finish", || {
+        let ended = wait(Duration::from_secs(60), "wf-recorder to finish", || {
             let moved = desktop
                 .warp(at.0.saturating_sub(2), at.1)
                 .and_then(|()| desktop.warp(at.0, at.1));
diff --git a/crates/study-showcase/src/docs.rs b/crates/study-showcase/src/docs.rs
index 1a8966f..e39c27a 100644
--- a/crates/study-showcase/src/docs.rs
+++ b/crates/study-showcase/src/docs.rs
@@ -448,8 +448,8 @@ fn reset() -> Vec<Step> {
     vec![key("Escape"), key("Escape"), rail(HOME), Step::Pause(800)]
 }
 
-/// The argument that makes only the scenes with a file missing, in every variant: what a
-/// fresh checkout runs before building the site, so it never starts a desktop for nothing.
+/// The argument that makes only the scenes with a file missing, in every variant: a new
+/// scene's, without making again the ones already committed.
 pub const MISSING: &str = "missing";
 
 /// Makes every scene whose name is in `only` (all if it is empty, or those with a file
@@ -659,6 +659,36 @@ mod tests {
         }
     }
 
+    #[test]
+    fn the_committed_captures_are_every_scenes_files_and_no_others() {
+        let repo = Path::new(env!("CARGO_MANIFEST_DIR")).join("../..");
+        let expected: HashSet<PathBuf> = scenes()
+            .iter()
+            .flat_map(|scene| {
+                Variant::all()
+                    .into_iter()
+                    .flat_map(|variant| scene.files(&repo, variant))
+            })
+            .collect();
+        for file in &expected {
+            assert!(
+                file.is_file(),
+                "{} is missing: make it with `just docs-media missing`",
+                file.display()
+            );
+        }
+        for dir in [SHOTS, CLIPS] {
+            for entry in std::fs::read_dir(repo.join(dir)).unwrap() {
+                let file = entry.unwrap().path();
+                assert!(
+                    expected.contains(&file),
+                    "{} is no scene's capture: delete it",
+                    file.display()
+                );
+            }
+        }
+    }
+
     #[test]
     fn the_theme_codes_are_the_desktops() {
         let source = include_str!("../../../apps/desktop/src/app/preferences.rs");
diff --git a/crates/study-showcase/src/lib.rs b/crates/study-showcase/src/lib.rs
index 5780c2c..510a367 100644
--- a/crates/study-showcase/src/lib.rs
+++ b/crates/study-showcase/src/lib.rs
@@ -1,6 +1,7 @@
 //! Records the demo GIF in the README (`just demo`) and the website's docs media
-//! (`just docs-media`). Both are build output, not sources: the Landing workflow makes them
-//! again on every deploy and publishes the GIF with the site, where the README shows it.
+//! (`just docs-media`). Both are output, not sources: they are committed so the website deploys
+//! without building the app, and the Captures workflow makes them all again, by hand, in a
+//! pull request. The site publishes the GIF, and the README shows it from there.
 //!
 //! The binary starts a private headless desktop (its own sway under `target/showcase`, never
 //! the shared one from `just desktop`), seeds a fresh database with the sample data, opens