fix(mcp): rename proxy-stdio command

[christso]

Summary

• rename the public MCP HTTP-to-stdio helper from mcp proxy-stdio to canonical mcp proxy
• remove the temporary proxy-stdio compatibility alias so proxy is now the only supported command
• update generated proxy args, tests, README/docs, and changelog/migration guidance

Why

proxy-stdio exposes an implementation detail in the public CLI surface. proxy is shorter, clearer in help output, and better matches what the command actually does.

Breaking change

Existing synced MCP client configs generated by older releases may still invoke allagents mcp proxy-stdio. After upgrading, re-run one of:

• allagents mcp update
• allagents update

That regenerates tracked MCP client configs to use allagents mcp proxy.

Validation

• bun run lint
• bun test
• bun run build
• bun run docs:build

E2E

Red

• bun run build
• node dist/index.js mcp proxy-stdio -h
• verified help exposed proxy-stdio as the current public subcommand before the original rename

Green

• bun run build
• created a temp workspace with .allagents/workspace.yaml containing claude and codex clients
• ran node dist/index.js --json mcp add deepwiki https://mcp.deepwiki.com/mcp --proxy from that workspace
• verified .mcp.json now contains args: ["mcp", "proxy", ...]
• verified .codex/config.toml contains proxy and not proxy-stdio
• ran node dist/index.js mcp proxy-stdio and verified it now fails with Not a valid subcommand name

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