ci: fix broken /beta/ docs site and stale root logo

.github/workflows/deploy-docs.yml

@@ -126,6 +126,10 @@ jobs:
           # (Runs with the main checkout's docs toolchain — tsx lives there.)
           pnpm --filter ./docs exec tsx "$GITHUB_WORKSPACE/.github/scripts/inject-docs-version-nav.ts" \
             /tmp/stable-docs/docs/.vitepress
+          # Brand assets follow main, not the tag: the stable site is the landing page,
+          # and a tag cut before a rebrand would otherwise serve the old logo forever.
+          rm -rf /tmp/stable-docs/docs/public
+          cp -r docs/public /tmp/stable-docs/docs/public
           cd /tmp/stable-docs
           pnpm install --frozen-lockfile
           pnpm --filter ./docs exec turbo build

turbo.json

@@ -32,6 +32,10 @@
     },
     "@temporal-contract/docs#build": {
       "dependsOn": ["^build", "^build:docs"],
+      // deploy-docs.yml passes these to build the versioned (/beta/) site; turbo's
+      // strict env mode drops anything undeclared, which silently builds the beta
+      // site with the root base and 404s every asset.
+      "env": ["DOCS_BASE", "DOCS_VERSIONS"],
       "outputs": [".vitepress/dist/**"]
     },
     "check:package": {