fix: use identity checks for type comparisons; remove mutable default argument

[harshadkhetpal]

Summary

1. opencontractserver/llms/tools/tool_factory.py — the annotation→JSON-schema dispatch chain compares type objects with == five times (param.annotation == int, float, bool, list, dict) — ruff E721. Identity (is) is the intended semantics for type objects and avoids surprises with metaclass-defined __eq__.

2. opencontractserver/pipeline/utils.py — run_post_processors(..., input_kwargs: dict[str, Any] = {}) shares one dict across every call (ruff B006). Changed to the None sentinel with input_kwargs = input_kwargs or {} after the docstring; identical behavior for all callers.

Testing

python -m py_compile passes on both files; ruff check --select B006,E721 on them goes clean.

🤖 Generated with Claude Code

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