Reconcile proxy-mode coverage docs with current implementation

[Copilot]

The docs understated proxy-mode coverage and did not clearly connect the container entrypoint’s host/mode overrides to the public environment variable reference. This updates the affected docs to match the current implementation surface.

• Proxy mode coverage

  • Updated the README proxy-mode summary to reflect current routing coverage:
    • ~50 REST URL patterns
    • ~15 GraphQL query patterns
  • Kept the README phrasing approximate while pointing readers to docs/PROXY_MODE.md for the authoritative details.

• Containerized env var documentation

  • Clarified docs/ENVIRONMENT_VARIABLES.md so the general note explicitly calls out run_containerized.sh using:
    • MCP_GATEWAY_HOST
    • MCP_GATEWAY_MODE
  • This aligns the note text with the existing container-specific table and the shell entrypoint behavior.

• Documentation delta illustrated

  - This maps ~25 REST URL patterns and GraphQL queries to guard tool names
  + This maps ~50 REST URL patterns and ~15 GraphQL query patterns to guard tool names

[Copilot]

Pull request overview

Updates user-facing documentation to accurately reflect the current proxy-mode routing coverage and to explicitly connect container entrypoint host/mode overrides to the public environment variable reference.

Changes:

• Updated the README proxy-mode summary to reflect current routing coverage (~50 REST patterns, ~15 GraphQL patterns).
• Clarified docs/ENVIRONMENT_VARIABLES.md to explicitly mention run_containerized.sh uses MCP_GATEWAY_HOST and MCP_GATEWAY_MODE for bind address and routing mode.

Show a summary per file

File	Description
README.md	Updates proxy-mode coverage summary and keeps docs/PROXY_MODE.md as the authoritative reference.
docs/ENVIRONMENT_VARIABLES.md	Connects the general HOST/MODE/PORT note to the container entrypoint’s documented MCP_GATEWAY_HOST/MCP_GATEWAY_MODE overrides.

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• Files reviewed: 2/2 changed files
• Comments generated: 0