Document MCP_GATEWAY_LOG_DIR environment variable

[Copilot]

The MCP_GATEWAY_LOG_DIR environment variable was implemented but not documented in README.md or AGENTS.md.

Changes

• Environment Variables section: Added MCP_GATEWAY_LOG_DIR with description that it sets the default for --log-dir flag
• Logging section: Documented configuration precedence and usage patterns
  • Precedence order: --log-dir flag → MCP_GATEWAY_LOG_DIR env var → /tmp/gh-aw/mcp-logs
  • Added examples for both environment variable and command-line flag usage
• Docker examples: Updated containerized mode documentation to show log directory mounting with MCP_GATEWAY_LOG_DIR
• AGENTS.md: Added MCP_GATEWAY_LOG_DIR to environment variables reference

Usage

# Using environment variable
export MCP_GATEWAY_LOG_DIR=/var/log/mcp-gateway
./awmg --config config.toml

# Using command-line flag (overrides env var)
./awmg --config config.toml --log-dir /var/log/mcp-gateway

# Docker with custom log directory
docker run -e MCP_GATEWAY_LOG_DIR=/custom/logs \
  -v /host/logs:/custom/logs ...

Original prompt

Update readme with latest updates related to MCP_GATEWAY_LOG_DIR

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