[WIP] Model harness for the AERIS model

[anagainaru]

Still in progress.

Summary

Motivation & Context

E.g. Fixes issue nr xyz

Approach

Screenshots / Logs (optional)

API / CLI Changes

• foo.bar(x: int) -> str (new)
• baz(qux: PathLike) (removed strict: bool)

Breaking Changes

• None

Performance (optional)

Case	Before	After	Notes
foo()	123 ms	88 ms	Median of 50 runs

Security & Privacy

• No secrets committed
• Input validation added where needed

Dependencies

• Added: orjson>=3.10
• Removed: ujson

Testing Plan

• Unit tests
• Integration tests
• e2e / smoke test
• Manual steps: python -m app --help

Documentation

• Docstrings updated
• User docs / README updated
• CHANGELOG entry

Checklist

• Code formatted (Ruff) → ruff format --check
• Lint passes (Ruff) → ruff check .
• Types pass (mypy/pyright) → mypy src
• Tests pass (pytest) → pytest -q

• Backward compatibility considered
• Adequate comments for tricky parts
• CI green

Risk & Rollback Plan

Probably not needed in the beginning

Notes for Reviewers