fix(mcp): support Host composition and prepare alpha.2 - #140
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Addresses the upstream MCP composition gaps reported in #138 and prepares
0.5.0-alpha.2onnext.toolPolicieswith declared Host failure schemas. Validate input before a policy, consume approval in the Host, and delegate once to the original Backend method with unchanged arguments/results. Keep Backend contracts and response budgets authoritative.instructionsthrough the public factory and SDK initialize handshake; synchronize API guidance and bilingual changelogs.Validation: full
pnpm check:cipassed, including 560 AVA tests, repository checks, contracts/docs, five installed tarballs, strict ESM/CJS declarations, 10 reference agent evaluations and real Chromium storage safety checks. Host composition tests cover dynamic discovery, instructions, installed docs/prompts, real save/materialize writes, one-use grants, Backend failures and response budgets.Scope: upstream OpenFairyGUI only. Downstream Host adoption and downstream acceptance remain owned by the consumer; this PR does not claim that migration is complete.