Add sandbox infrastructure for isolated diagnostics and simulations

[Copilot]

Adds isolated execution environments for running transparency diagnostics and scenario-based simulations.

Implementation

Core Sandbox (src/sandbox/index.ts)

• Isolated execution with configurable timeout and cleanup (prevents memory leaks)
• Built-in logging with level filtering
• Structured result objects containing success state, data, duration, and logs

Diagnostic Runner (src/sandbox/diagnostics.ts)

• Test registration and batch execution
• Pass/fail/skip status tracking
• Aggregated reporting

Simulation Runner (src/sandbox/simulation.ts)

• Scenario-based testing with typed input/output
• Optional validation functions
• Success determination based on execution + validation results

Configuration (src/config/index.ts)

• SANDBOX_ENABLED, SANDBOX_DEFAULT_TIMEOUT, SANDBOX_LOG_LEVEL env vars

Usage

// Basic sandbox execution
const result = await runInSandbox('transparency-check', async () => {
  const score = await checkTransparency();
  return { transparent: score > 0.5, score };
});

// Diagnostics
const results = await runDiagnostics([
  {
    name: 'config-validation',
    description: 'Validate transparency config',
    run: () => validateConfig(),
  },
]);

// Simulations
const results = await runSimulations([
  {
    name: 'high-load',
    input: { events: 1000 },
    run: async (input) => processEvents(input.events),
    validate: (output) => output.processed === 1000,
  },
]);

Complete examples in src/sandbox/examples.ts.

Original prompt

I need to add Sandboxes to my Repository to run diagnostics and other simulations for running transparency etc.

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[lippytm]

I hope I am doing this right.