feat: brand the npm page, CLI output, and reports (#432)

* docs: rebuild the npm package README on the main README's identity

* docs: point the README banner fallback at an asset that exists

* docs: declare the npm package author, homepage, and issue tracker

* docs(cli): retire "Framework" and settle on the canonical product line

* docs: describe the banner image in alt text instead of repeating the lockup

* feat(cli): print a plain-text banner when stdout is not a terminal

* feat(report): attribute the markdown report from a shared brand constant

* feat(cli): frame the plain-text banner with rules and split the version line

* docs: drop the URL from the npm author field

apps/cli/src/index.ts

@@ -1,5 +1,5 @@
 /**
- * Shannon CLI — AI Penetration Testing Framework
+ * Shannon CLI — AI Pentester for Web Apps and APIs
  *
  * Unified CLI supporting two modes:
  *   Local mode: Run from cloned repo — builds locally, mounts prompts, uses ./workspaces/
@@ -79,7 +79,7 @@ function showHelp(withSplash: boolean): void {
   const mode = getMode();
   const prefix = commandPrefix();
 
-  const header = withSplash ? '' : '\nShannon - AI Penetration Testing Framework\n';
+  const header = withSplash ? '' : '\nShannon — AI Pentester by Keygraph\n';
 
   console.log(`${header}
 Usage: