Struct GateContext 

pub struct GateContext<'a> {
    pub session_id: Option<&'a str>,
    pub scope: Option<&'a RuntimeScope>,
    pub state: &'a HashMap<String, Value>,
    pub versions: &'a HashMap<String, u64>,
}

Read-only context handed to each gate at admission time.

It carries the cheap, always-available facts a gate needs to reason about a proposal without reaching back into the Runtime (which would create a borrow cycle, since gates are stored on the runtime). Gates that need richer inputs — per-tool information-flow labels (A3/A4), the timestamped multi-agent schedule (A5) — hold those as their own state, captured when the gate is constructed.

Fields

session_id: Option<&'a str>

The session the proposal executes under, if any. Lets a gate apply session-scoped rules on top of global ones, mirroring the per-session policy registries.

scope: Option<&'a RuntimeScope>

The caller/tenant identity attached to this execution (car#187).

state: &'a HashMap<String, Value>

A snapshot of shared state at admission time.

versions: &'a HashMap<String, u64>

Per-key version counters for the same snapshot — the input the transactional / information-flow checks reason over.