feat(KB-107): merge kb/kb-107

- feat(KB-107): complete Step 5 — add changeset for behavioral change
- test(KB-107): complete Step 4 — update tests to remove --no-open flag references
- feat(KB-107): complete Step 3 — remove --no-open from pi extension dashboard spawn
- feat(KB-107): complete Step 2 — simplify dashboard command, remove openBrowser function
- feat(KB-107): complete Step 1 — remove --no-open flag from CLI entry point

packages/cli/src/extension.ts

@@ -866,7 +866,7 @@ export default function kbExtension(pi: ExtensionAPI) {
       const port = trimmed ? parseInt(trimmed, 10) || 4040 : 4040;
 
       // Find the kb binary: prefer local node_modules, then global
-      const child = spawn("kb", ["dashboard", "--port", String(port), "--no-open"], {
+      const child = spawn("kb", ["dashboard", "--port", String(port)], {
         cwd: ctx.cwd,
         stdio: ["ignore", "pipe", "pipe"],
         detached: false,