Function gen_agent_event

core/tests/test_persisted_schema_roundtrip.rs:360–408

Cheap-to-construct, representative `AgentEvent`s — including the three variants added in 3.3.0 (`BudgetThresholdHit`, `PassivationRequested`, `PeerInvocation`), since these are persisted inside `RunRecord.events` and an old reader/writer mismatch around them is the live cross-version risk.

(rng: &mut Rng)

/// and an old reader/writer mismatch around them is the live cross-version
/// risk.
fn gen_agent_event(rng: &mut Rng) -> AgentEvent {
    match rng.below(9) {
        0 => AgentEvent::Start {
            prompt: rng.string(),
        },
        1 => AgentEvent::TurnStart {
            turn: rng.usize_below(100),
        },
        2 => AgentEvent::ToolStart {
            id: rng.string(),
            name: rng.string(),
        },
        3 => AgentEvent::ToolEnd {
            id: rng.string(),
            name: rng.string(),
            output: rng.string(),
            exit_code: rng.i32_small(),
            metadata: if rng.boolean() {
                Some(rng.json_value_non_null(2))
            } else {
                None
            },
            error_kind: None,
        },
        4 => AgentEvent::Error {
            message: rng.string(),
        },
        5 => AgentEvent::TurnEnd {
            turn: rng.usize_below(100),
            usage: gen_token_usage(rng),
        },
        6 => AgentEvent::BudgetThresholdHit {
            resource: rng.string(),
            kind: rng.string(),
            consumed: rng.f64_finite(),
            limit: rng.f64_finite(),
            message: rng.opt_string(),
        },
        7 => AgentEvent::PassivationRequested {
            reason: rng.string(),
            deadline_ms: rng.opt_u64(),
        },
        _ => AgentEvent::PeerInvocation {
            from_session_id: rng.string(),
            from_tenant_id: rng.opt_string(),
            correlation_id: rng.opt_string(),
        },
    }
}

fn gen_run_status(rng: &mut Rng) -> RunStatus {
    match rng.below(7) {