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>

nfpm.yaml

@@ -10,3 +10,11 @@ contents:
     dst: /usr/bin/mcpctl
     file_info:
       mode: 0755
+  - src: ./completions/mcpctl.bash
+    dst: /usr/share/bash-completion/completions/mcpctl
+    file_info:
+      mode: 0644
+  - src: ./completions/mcpctl.fish
+    dst: /usr/share/fish/vendor_completions.d/mcpctl.fish
+    file_info:
+      mode: 0644