feat(desktop): wire gateway support

Add the backend session, cwd, and attachment plumbing needed by the desktop shell while keeping generated build state out of git.

.gitignore

@@ -54,6 +54,7 @@ environments/benchmarks/evals/
 
 # Web UI build output
 hermes_cli/web_dist/
+apps/desktop/dist/
 
 # Web UI assets — synced from @nous-research/ui at build time via
 # `npm run sync-assets` (see web/package.json).
@@ -70,3 +71,12 @@ mini-swe-agent/
 result
 website/static/api/skills-index.json
 models-dev-upstream/
+
+# Local editor / agent tooling (machine-specific; keep in global config, not the repo)
+.codex/
+.cursor/
+.gemini/
+.zed/
+.mcp.json
+opencode.json
+config/mcporter.json