docs: Document MCP security model and trust boundaries #8

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This document describes how credentials and sensitive environment variables are handled within the MCP tools monorepo.
## Separate Credentials
Even though multiple MCP servers share the same monorepo, they **must** have separate credentials and runtimes.
Even though multiple MCP servers share the same monorepo, they **must** have separate credentials and runtimes.
- **No Shared Environments**: Each MCP server (`gitea-mcp`, `jenkins-mcp`, `ops-mcp`, etc.) must be instantiated as an independent service with its own dedicated `.env` configuration file.
- **Strict Isolation**: A server will only have access to the credentials required for its specific trust boundary. For instance, `gitea-mcp` has no access to Jenkins or Ops authentication tokens.
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## Orchestrator Role
The `release-mcp` package may be introduced later to coordinate workflows across the different MCP packages.
- **Coordination, not Consolidation**: It can call or compose other tools, but it **must not** become an all-powerful server holding credentials for all other components.
- **Coordination, not Consolidation**: It can call or compose other tools, but it **must not** become an all-powerful server holding credentials for all other components.
- **Example Workflows**: Tasks such as collecting release evidence, verifying TEST deploy checklists, summarizing state (issue/PR/build/deploy), and posting evidence back to Gitea.
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This document defines the strict boundaries between the different MCP server packages within the monorepo.
The project is named **MCP Control Plane** and lives in the `mcp-control-plane` repository. It groups the following packages: `common`, `gitea-mcp`, `jenkins-mcp`, `ops-mcp`, and `release-mcp`.
## 1. Architectural Philosophy
- **One MCP Server per Trust Boundary**: While the packages share a monorepo, their runtime services must remain entirely separate. There is no single "everything" server.