refactor(nodes)!: align node initialization signatures

[laipz8200]

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Related Issue

Closes #38

Summary

• normalize Node and concrete node constructors around node_id, typed *NodeData configs, and explicit injected dependencies
• make ToolNode and HumanInputNode runtime requirements explicit while preserving the node_id public parameter name
• update direct construction sites in tests and examples to use typed node config objects instead of raw {"id", "data"} wrappers
• align the base constructor flow so node identity is sourced from node_id and node data validation runs on the typed config payload

This is a breaking API change for downstream callers that construct nodes directly with raw NodeConfigDict payloads or omit required runtime collaborators for tool and human-input nodes. The root cause is that node construction had diverged between the base class, concrete nodes, and direct call sites.

Checklist

• This pull request links the issue it resolves or advances
• This pull request title follows Conventional Commits, and any breaking change is marked with !
• If CLA Assistant prompted me, I signed CLA.md in the pull request conversation