docs(fern): sync announcement configuration

fern/README.md

@@ -13,7 +13,7 @@ OpenShell uses [Fern](https://buildwithfern.com/) to validate, preview, and publ
 | `fern/assets/` | Logos and other shared assets. |
 | `fern/main.css` | Site-wide styles. |
 
-In a normal source checkout, `fern/docs.yml` points the `latest` version at `docs/index.yml`. Release automation builds the multi-version configuration on the generated `docs-website` branch.
+In a normal source checkout, `fern/docs.yml` points the `dev` version at `docs/index.yml`. Release automation builds the multi-version configuration on the generated `docs-website` branch and maps the source documentation to the channel being published.
 
 ## Local development
 
@@ -54,6 +54,8 @@ The sync and publish workflows share the `docs-website` concurrency group. This
 
 The `dev` snapshot also owns the shared Fern configuration, components, assets, and CSS on `docs-website`. The `latest` snapshot copies its documentation and navigation but does not replace those shared files. This keeps the site configuration aligned with `main` while preserving the released content.
 
+A `dev` sync copies the top-level `announcement` from the source `fern/docs.yml`. This announcement is the global fallback, and removing it from the source removes it from `docs-website`. Each snapshot sync copies the source version announcement only to the channel being updated. A version announcement overrides the global announcement for that version, so Release Dev cannot change the `latest` announcement and Release Tag cannot change the `dev` announcement.
+
 ## Manual maintenance and publishing
 
 Maintainers can run `.github/workflows/sync-docs.yml` manually to add, refresh, or remove a historical version snapshot. The workflow preserves snapshots that were not selected. Production publishing is disabled by default for a manual sync.

fern/docs.yml

@@ -2,7 +2,7 @@
 # SPDX-License-Identifier: Apache-2.0
 # Fern site config — merged with skills/convert-to-fern/assets/theme/nvidia/docs-theme.yml pattern
 # Production: https://docs.nvidia.com/openshell/ — preview + custom-domain share path prefix `openshell`.
-# Internal MDX links use /latest/...; basepath-aware resolves them under /openshell/ on production.
+# Source checkouts and pull request previews expose the current documentation at /dev.
 instances:
   - url: openshell.docs.buildwithfern.com/openshell
     custom-domain: docs.nvidia.com/openshell
@@ -38,7 +38,7 @@ logo:
   dark: ./assets/NVIDIA_dark.svg
   light: ./assets/NVIDIA_light.svg
   height: 20
-  href: /openshell/latest
+  href: /openshell
   right-text: OpenShell
 
 favicon: ./assets/NVIDIA_symbol.svg
@@ -56,11 +56,10 @@ experimental:
     - ./components
 
 versions:
-  - display-name: Latest
+  - display-name: Dev
     path: ../docs/index.yml
-    slug: latest
-    announcement:
-      message: '<span style="display: block; padding: 0.375rem 0; text-align: left;"><strong>OpenShell 0.1.0 is coming soon.</strong> <a href="https://github.com/NVIDIA/OpenShell/milestone/10" target="_blank" rel="noreferrer">Track progress in the 0.1.0 milestone</a>, <a href="https://docs.nvidia.com/openshell/dev/index.html" target="_blank" rel="noreferrer">read the prerelease documentation</a>, or <a href="https://docs.nvidia.com/openshell/dev/about/installation#install-a-prerelease" target="_blank" rel="noreferrer">install a prerelease</a>.</span>'
+    slug: dev
+    availability: beta
 
 redirects:
   - source: "/openshell/latest/sandboxes/providers-v2"

tasks/scripts/sync_docs_website.py

@@ -36,6 +36,7 @@ class VersionEntry:
     display_name: str
     path: str
     availability: str | None = None
+    announcement: YamlMapping | None = None
 
 
 def parse_args() -> argparse.Namespace:
@@ -312,6 +313,7 @@ def parse_versions(raw_versions: object) -> list[VersionEntry]:
         display_name = entry.get("display-name")
         path = entry.get("path")
         availability = entry.get("availability")
+        announcement = entry.get("announcement")
         if (
             isinstance(slug, str)
             and isinstance(display_name, str)
@@ -325,6 +327,9 @@ def parse_versions(raw_versions: object) -> list[VersionEntry]:
                     availability=availability
                     if isinstance(availability, str)
                     else None,
+                    announcement=cast("YamlMapping", announcement)
+                    if isinstance(announcement, dict)
+                    else None,
                 )
             )
     return entries
@@ -349,8 +354,8 @@ def ordered_entries(
     return [by_slug[slug] for slug in order]
 
 
-def render_versions(entries: list[VersionEntry]) -> list[dict[str, str]]:
-    rendered: list[dict[str, str]] = []
+def render_versions(entries: list[VersionEntry]) -> list[YamlMapping]:
+    rendered: list[YamlMapping] = []
     for entry in entries:
         item = {
             "display-name": entry.display_name,
@@ -359,10 +364,36 @@ def render_versions(entries: list[VersionEntry]) -> list[dict[str, str]]:
         }
         if entry.availability is not None:
             item["availability"] = entry.availability
+        if entry.announcement is not None:
+            item["announcement"] = entry.announcement
         rendered.append(item)
     return rendered
 
 
+def sync_global_announcement(source_docs_yml: Path, target_docs_yml: Path) -> None:
+    source_data = read_yaml(source_docs_yml)
+    source_announcement = source_data.get("announcement")
+    if source_announcement is not None and not isinstance(source_announcement, dict):
+        raise ValueError("docs.yml announcement must be a mapping")
+
+    target_data = read_yaml(target_docs_yml)
+    if source_announcement is None:
+        target_data.pop("announcement", None)
+    else:
+        target_data["announcement"] = source_announcement
+    write_yaml(target_docs_yml, target_data)
+
+
+def source_version_announcement(docs_yml: Path, slug: str) -> YamlMapping | None:
+    entries = parse_versions(read_yaml(docs_yml).get("versions"))
+    for entry in entries:
+        if entry.slug == slug:
+            return entry.announcement
+    if len(entries) == 1:
+        return entries[0].announcement
+    return None
+
+
 def component_dirs(fern_dir: Path) -> list[str]:
     dirs: list[str] = []
     preferred = ["pages-latest", "pages-dev"]
@@ -408,6 +439,7 @@ def write_snapshot(
         copy_if_exists(
             source_fern / "fern.config.json", target_fern / "fern.config.json"
         )
+        sync_global_announcement(source_fern / "docs.yml", target_fern / "docs.yml")
 
     versions_dir = target_fern / "versions"
     versions_dir.mkdir(parents=True, exist_ok=True)
@@ -483,6 +515,9 @@ def sync_docs(args: argparse.Namespace) -> None:
                 display_name=slug,
                 path=f"./versions/{slug}.yml",
                 availability=stable_availability,
+                announcement=source_version_announcement(
+                    source_fern / "docs.yml", slug
+                ),
             ),
             refresh_shared=False,
         )
@@ -509,6 +544,9 @@ def sync_docs(args: argparse.Namespace) -> None:
                     display_name=display_override or f"Latest ({slug})",
                     path="./versions/latest.yml",
                     availability=stable_availability,
+                    announcement=source_version_announcement(
+                        source_fern / "docs.yml", "latest"
+                    ),
                 ),
                 refresh_shared=False,
             )
@@ -548,6 +586,7 @@ def sync_docs(args: argparse.Namespace) -> None:
             display_name=display_name,
             path=f"./versions/{slug}.yml",
             availability=availability,
+            announcement=source_version_announcement(source_fern / "docs.yml", slug),
         ),
         refresh_shared=channel == "dev",
     )