Resolve CI Ruff failures in app and space server entrypoints

[Copilot]

The CI/CD pipeline was failing across Python 3.10–3.13 before tests ran because Ruff flagged import, undefined-name, and exception-chaining issues in the web entrypoints. This change tightens those files so the matrix can progress past lint consistently.

• app.py

  • Restore missing json and QuantumCircuit imports used by QRNG, noisy simulation, and benchmark output paths
  • Update the Bell-pair UI handler to match the current bell_pair(engine) API and render the returned circuit correctly

• space_server.py

  • Normalize top-level and local import ordering to satisfy Ruff import rules
  • Remove the unused StaticFiles import
  • Chain HTTPException re-raises with from e in API handlers to preserve exception context

• Behavioral alignment

  • Keep the existing endpoint/UI behavior intact while making the entrypoints consistent with the current module interfaces and lint policy

def create_bell_pair():
    try:
        result = bell_pair(engine)
        return result.circuit.draw(output="text")
    except Exception as e:
        return f"Error: {str(e)}"

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Project	Deployment	Actions	Updated (UTC)
q-pyth	Ready	Preview, Comment	Apr 5, 2026 3:50am

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[Copilot]

Pull request overview

This PR addresses Ruff lint failures in the project’s web entrypoints so CI can proceed to the test phase, and aligns the Gradio Bell-pair handler with the current bell_pair(engine) API.

Changes:

• Fix/normalize imports in app.py and space_server.py (missing imports + Ruff-friendly ordering).
• Update the Gradio Bell-pair UI handler to call bell_pair(engine) and render the returned circuit.
• Improve FastAPI error re-raises by chaining HTTPException(... ) from e to preserve traceback context.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
space_server.py	Import ordering cleanup and exception chaining in API endpoints to satisfy Ruff and preserve error context.
app.py	Restore needed imports and update the Bell-pair UI handler to use the current bell_pair(engine) interface.

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[Copilot]

qrng_phi_sequence is being called with request.count as the first positional argument, but its signature is qrng_phi_sequence(engine, num_qubits=..., length=...). This will raise a TypeError at runtime and breaks the phi-scaled QRNG path. Pass engine explicitly and map request.count to the length parameter (and optionally expose num_qubits if needed).

Suggested change

	result = qrng_phi_sequence(request.count)
	result = qrng_phi_sequence(engine, length=request.count)

[Copilot]

result.circuit.draw(output="text") returns a Qiskit drawing object (e.g., TextDrawing), not a plain string. Gradio Textbox outputs are simplest/most reliable when they receive a string; consider converting the drawing to str(...) (or calling .__str__()) before returning so the UI consistently renders the diagram.

Suggested change

	return result.circuit.draw(output="text")
	return str(result.circuit.draw(output="text"))