fix: align zod object schemas with stripped properties

[Genmin]

Summary

• mark converted default Zod object schemas with additionalProperties: false when Zod validation will strip unknown keys
• preserve explicit passthrough schemas and avoid adding a root additionalProperties to union schemas
• assert the advertised tool schema now matches runtime behavior for registered tools

Fixes #147.

Validation

• pnpm --filter @modelcontextprotocol/core test -- packages/core/test/util/standardSchema.test.ts
• pnpm --filter @modelcontextprotocol/server test -- test/integration/test/server/mcp.test.ts -t "should register tool with params"
• pnpm --filter @modelcontextprotocol/core typecheck
• pnpm --filter @modelcontextprotocol/core lint
• pnpm --filter @modelcontextprotocol/test-integration lint
• pre-push: full typecheck:all, build:all, and lint:all

[changeset-bot]

🦋 Changeset detected

Latest commit: 705f264

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@modelcontextprotocol/core	Patch
@modelcontextprotocol/test-integration	Patch

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commit: 705f264

[Genmin]

Added the missing patch changeset for the touched core and integration packages so the release-metadata blocker should clear on the next checks run. This is metadata-only; the previous code checks were green.