feat: add ${VAR} environment variable expansion in mcp.json#2
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Expands ${VAR} references in all string fields (command, args, url,
headers, env values) during config loading. Fails fast if a referenced
variable is not set. Bare $VAR syntax is not expanded.
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Expands ${VAR} references in all string fields (command, args, url, headers, env values) during config loading. Fails fast if a referenced variable is not set. Bare $VAR syntax is not expanded.