chore: gitignore local-only OpenDeploy and pitch files

- Dockerfile.opendeploy: local OpenDeploy build that hardcodes the public
  image-proxy URL; kept out of the repo so a public fork doesn't route image
  traffic through our Cloudflare Worker.
- .opendeploy: OpenDeploy CLI local context/credentials dir.
- pitch/: local pitch materials.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.gitignore

@@ -16,6 +16,7 @@ out
 
 .open-next
 .wrangler
+.opendeploy
 
 .DS_Store
 *.log
@@ -26,3 +27,9 @@ repomix-output.xml
 
 users.md
 .dev.vars
+
+pitch/
+
+# OpenDeploy-only build with hardcoded public proxy URL — local, never commit
+# (a public fork would route image traffic through our Cloudflare Worker).
+Dockerfile.opendeploy