feat(agentcompany-rust): scaffold native shell and runtime bridge

AgentCompany-Rust/crates/support/src/time.rs

@@ -0,0 +1,8 @@
+use anyhow::{Context, Result};
+use time::{OffsetDateTime, format_description::well_known::Rfc3339};
+
+pub fn now_iso() -> Result<String> {
+    OffsetDateTime::now_utc()
+        .format(&Rfc3339)
+        .context("failed to format UTC timestamp")
+}