fix: resolve CI failures for scp governance stack

- Removed unnecessary 'async' from backend route handler to satisfy Deno lint.
- Standardized Netlify _headers and _redirects formatting (trailing newlines, no extra blanks).
- Fixed markdownlint MD026 (trailing punctuation) in briefing deck.
- Verified all artifacts via automated governance validation suite.

Co-authored-by: OneFineStarstuff <87420139+OneFineStarstuff@users.noreply.github.com>

Author: google-labs-jules[bot]

backend/server.js

@@ -77,7 +77,7 @@ app.use((req, res, next) => {
   next()
 })
 
-app.get('/api/wheel/stages', async (_req, res) => {
+app.get('/api/wheel/stages', (_req, res) => {
   const stages = [
     {
       id: 1,

docs/sandbox-exit-dossier/SUPERVISORY_BRIEFING_DECK.md

@@ -54,5 +54,5 @@
 
 ---
 
-### Speaker Notes Snippet (Slide 5):
+### Speaker Notes Snippet (Slide 5)
 "Our Verifier Nodes allow you, the regulator, to verify that every decision made by our AI models was governed by the board-approved policy. You see the proof, you see the Merkle root, but you don't need to see the raw data—preserving both privacy and accountability."