docs: one universal DMG, and changelog blocks from notes.py

AGENTS.md

@@ -40,7 +40,7 @@ Run the three scripts against an app checkout at the `main` the change describes
 
 - **A change that documents an app change** opens as a draft pull request whose description names the app pull request (`TableProApp/TablePro#1234`). CI checks against the app's `main`, so it goes green once the app pull request merges; mark it ready then.
 - **The daily run** catches an app change that broke a claim here. Fix the page, not the check.
-- **Releases.** The `release` skill in the app repository pushes the version's `<Update>` block in `changelog.mdx` straight to `main`. Every version in the app's `CHANGELOG.md` must be on that page.
+- **Releases.** For each stable release, the app's `release` skill opens a `docs(changelog): vX.Y.Z` pull request whose `<Update>` block in `changelog.mdx` is written by the app's `scripts/release/notes.py docs`, and merges it once the release is published. Every version in the app's `CHANGELOG.md` must be on that page.
 
 ## Writing style
 

installation.mdx

@@ -3,12 +3,12 @@ title: Installation
 description: Install TablePro via Homebrew or DMG on macOS 13.0+
 ---
 
-Homebrew is the short route: `brew install --cask tablepro` picks the build that matches your Mac. Everyone else takes the DMG, and that is the one route where you match the architecture yourself.
+Homebrew is the short route: `brew install --cask tablepro`. Everyone else takes the DMG.
 
 ## System requirements
 
 - **macOS**: 13.0 (Ventura) or later
-- **Architecture**: Apple Silicon (M1 or later) or Intel x86_64
+- **Architecture**: Apple Silicon (M1 or later) or Intel x86_64, one universal app for both
 
 Native Apple frameworks only, so there is no Java or .NET runtime to install first. The download is about 20 MB.
 
@@ -24,8 +24,8 @@ brew uninstall --zap tablepro   # remove the app and its data
 ## The DMG
 
 <Steps>
-  <Step title="Download the asset for your Mac">
-    Release assets carry the version and the architecture: `TablePro-<version>-arm64.dmg` and `TablePro-<version>-x86_64.dmg`. Check which you need under **Apple menu > About This Mac**, where Chip means Apple Silicon and Processor means Intel. Both are on [GitHub Releases](https://github.com/TableProApp/TablePro/releases).
+  <Step title="Download the DMG">
+    Download `TablePro-<version>.dmg` from [GitHub Releases](https://github.com/TableProApp/TablePro/releases). The same file runs on every supported Mac.
   </Step>
   <Step title="Drag it to Applications">
     Open the DMG and drag **TablePro** onto the **Applications** shortcut.

scripts/check-docs-against-source.py

@@ -220,14 +220,10 @@ def check_pluginkit_version(root: Path, docs: Path) -> list[str]:
 def check_changelog_parity(root: Path, docs: Path) -> list[str]:
     """Every release in CHANGELOG.md must appear on the changelog page.
 
-    The two are not copies of each other and must not be generated from one another:
-    0.67.0 is 201 terse entries in CHANGELOG.md and 113 merged, longer ones on the
-    page, because the page is edited for readers and the file is edited for the
-    release notes. What they must agree on is which versions exist.
-
-    The check is deliberately one-way. The page may carry a version the file does not,
-    which is how 0.39.0 is documented: it was tagged and shipped, failed to launch with
-    errno 163, and 0.39.1 replaced it the same day.
+    The app's scripts/release/notes.py docs writes each stable's block from its CHANGELOG.md
+    section. The check stays one-way: the page may carry a version the file does not, which is
+    how 0.39.0 is documented. It shipped, failed to launch with errno 163, and 0.39.1 replaced it
+    the same day.
     """
     shipped = set(
         re.findall(r"^## \[([0-9][^\]]*)\]", (root / "CHANGELOG.md").read_text(), re.M)