chore: import upstream snapshot with attribution

crates/jcode-ambient-types/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "jcode-ambient-types"
+version = "0.1.0"
+edition = "2024"
+publish = false
+
+[dependencies]
+chrono = { version = "0.4", features = ["serde"] }
+serde = { version = "1", features = ["derive"] }

crates/jcode-ambient-types/src/lib.rs

@@ -0,0 +1,32 @@
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+pub enum UsageSource {
+    User,
+    Ambient,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct UsageRecord {
+    pub timestamp: DateTime<Utc>,
+    pub source: UsageSource,
+    pub tokens_input: u32,
+    pub tokens_output: u32,
+    pub provider: String,
+}
+
+impl UsageRecord {
+    pub fn total_tokens(&self) -> u64 {
+        self.tokens_input as u64 + self.tokens_output as u64
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct RateLimitInfo {
+    pub limit_tokens: Option<u64>,
+    pub remaining_tokens: Option<u64>,
+    pub limit_requests: Option<u64>,
+    pub remaining_requests: Option<u64>,
+    pub reset_at: Option<DateTime<Utc>>,
+}