Merge FASE 4: diagrams folder with 8 Mermaid + SVGs

Resolves two conflicts:

- docs/diagrams/README.md: FASE 3 created a placeholder, FASE 4 created the
  canonical content. Adopts FASE 4 content and updates the doc paths to the
  FASE 3 subfolder layout (architecture/, frameworks/, routing/, guides/).
- package.json: combined FASE 1's new scripts/build/ and scripts/check/ paths
  with FASE 4's new docs:render-diagrams script.

Post-merge fixes:
- Rewrites diagram link paths in the 7 subfolder docs from ./diagrams/X to
  ../diagrams/X (FASE 4 added flat-layout links before FASE 3's subfolder move).
- Adds the i18n-flow diagram link to docs/guides/I18N.md (auto-merge missed it).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/frameworks/CLOUD_AGENT.md

@@ -12,6 +12,10 @@ A Cloud Agent task is **not** a regular chat completion. It is a durable, multi-
 unit of work that may take minutes to hours, can produce a Pull Request as its
 artifact, and supports follow-up messages and (in some providers) plan approval gates.
 
+![Cloud Agent task lifecycle](../diagrams/exported/cloud-agent-flow.svg)
+
+> Source: [diagrams/cloud-agent-flow.mmd](../diagrams/cloud-agent-flow.mmd)
+
 ## Supported Agents
 
 | Provider ID   | Class             | Source                               | Upstream Base URL                       | Plan Approval |

docs/frameworks/MCP-SERVER.md

@@ -4,6 +4,10 @@
 >
 > Source of truth: `open-sse/mcp-server/schemas/tools.ts` (30 tools) + `open-sse/mcp-server/tools/memoryTools.ts` (3 tools) + `open-sse/mcp-server/tools/skillTools.ts` (4 tools). Tool registration and scope wiring lives in `open-sse/mcp-server/server.ts`.
 
+![MCP tool inventory (37 tools by category)](../diagrams/exported/mcp-tools-37.svg)
+
+> Source: [diagrams/mcp-tools-37.mmd](../diagrams/mcp-tools-37.mmd)
+
 ## Installation
 
 OmniRoute MCP is built-in. Start it with: