feat: add contextual help and stabilize repository layout

tests/renderer-workflow.test.mjs

@@ -218,19 +218,35 @@ test("one-click troubleshooting excludes destructive or publishing Git actions",
   );
 });
 
-test("premium repository workspace reserves separate rows for actions and release status", async () => {
+test("premium repository workspace groups variable context above a stable tab row", async () => {
+  const renderer = await rendererSource();
   const styles = await readFile(
     new URL("../src/renderer/styles.css", import.meta.url),
     "utf8",
   );
   assert.match(
     styles,
-    /\.repo-workspace\s*\{[^}]*grid-template-rows:\s*auto auto auto 39px minmax\(0, 1fr\)/s,
+    /\.repo-workspace\s*\{[^}]*grid-template-rows:\s*auto auto 39px minmax\(0, 1fr\)/s,
   );
+  assert.match(renderer, /<div class="repo-context">/);
+  assert.match(styles, /\.tabs\s*\{[^}]*overflow-x:\s*auto/s);
+  assert.match(styles, /\.tab\s*\{[^}]*white-space:\s*nowrap/s);
   assert.match(styles, /prefers-reduced-motion/);
   assert.match(styles, /ForgeFlow 0\.8 premium visual system/);
 });
 
+test("help center explains core workflows and supports contextual searchable guidance", async () => {
+  const renderer = await rendererSource();
+  assert.match(renderer, /function renderHelp\(\)/);
+  assert.match(renderer, /id: "workspace-sync"/);
+  assert.match(renderer, /id: "deployment-linking"/);
+  assert.match(renderer, /id: "deploy-keys"/);
+  assert.match(renderer, /id: "git-validator"/);
+  assert.match(renderer, /id="help-search"/);
+  assert.match(renderer, /data-action="open-context-help" data-topic="workspace-sync"/);
+  assert.match(renderer, /ui\.currentView === "help"/);
+});
+
 test("interactive project illustrations are semantic, responsive and motion-safe", async () => {
   const renderer = await rendererSource();
   const styles = await readFile(