feat: implement v2 3-tier architecture (mcpctl → mcplocal → mcpd)

- Rename local-proxy to mcplocal with HTTP server, LLM pipeline, mcpd discovery
- Add LLM pre-processing: token estimation, filter cache, metrics, Gemini CLI + DeepSeek providers
- Add mcpd auth (login/logout) and MCP proxy endpoints
- Update CLI: dual URLs (mcplocalUrl/mcpdUrl), auth commands, --direct flag
- Add tiered health monitoring, shell completions, e2e integration tests
- 57 test files, 597 tests passing

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/build-rpm.sh

@@ -10,6 +10,9 @@ if [ -f .env ]; then
   set -a; source .env; set +a
 fi
 
+# Ensure tools are on PATH
+export PATH="$HOME/.npm-global/bin:$HOME/.bun/bin:$HOME/.local/bin:$PATH"
+
 echo "==> Building TypeScript..."
 pnpm build