qubit-budget 0.3.0

Dependency-light resource limit and budget accounting primitives for Qubit Rust crates
Documentation 
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// =============================================================================
//    Copyright (c) 2026 Haixing Hu.
//
//    SPDX-License-Identifier: Apache-2.0
//
//    Licensed under the Apache License, Version 2.0.
// =============================================================================
//! Verifies encode-attempt output and value accounting boundaries.

use qubit_budget::json::JsonEncodeLimits;
use qubit_budget::json::JsonEncodeSession;
use qubit_budget::json::JsonMeasurement;
use qubit_budget::json::JsonResource;

/// Verifies dropping an attempt keeps accepted output and rolls back values.
#[test]
fn test_encode_attempt_drop_preserves_output_only() {
    let mut session = JsonEncodeSession::owned(
        JsonEncodeLimits::<JsonResource, usize>::builder()
            .max_output_bytes(4)
            .max_nodes(1)
            .build(),
    );
    {
        let mut attempt = session.begin_value();
        attempt.try_consume_output_bytes(2).expect("output charge fits");
        attempt
            .try_admit(JsonMeasurement::Null { depth: 1 })
            .expect("value admission fits");
    }

    assert_eq!(session.output_budget().expect("output budget").used(), 2);
    assert_eq!(session.value_budget().used_nodes(), Some(0));
}

#[test]
fn test_encode_attempt_can_consume_output_bytes() {
    let mut session = JsonEncodeSession::owned(
        JsonEncodeLimits::<JsonResource, usize>::builder()
            .max_output_bytes(4)
            .build(),
    );
    let mut attempt = session.begin_value();
    attempt.try_consume_output_bytes(3).expect("output charge fits");
    assert_eq!(attempt.output_budget().expect("output budget").used(), 3);
}