fix: respect disabled listChanged capabilities on v1.x

[paulelliotco]

Summary

• preserve explicit listChanged: false settings when McpServer registers tool, resource, and prompt capabilities
• stop emitting notifications/*/list_changed when the corresponding capability is not advertised
• add regression tests for capability advertisement, runtime notification suppression, and direct access to Server.getCapabilities()

Fixes #1819

Testing

• npm run lint
• npx vitest run test/server/mcp.test.ts

Notes

• npm run typecheck still fails on pre-existing unrelated test call signatures in test/integration-tests/taskLifecycle.test.ts and test/shared/protocol.test.ts

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Latest commit: 843c76f

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commit: 843c76f