refactor: single now_unix in hive_sh4re::wire_time

replaces 15 per-module copies (now_unix/now_secs) across hive-c0re and
hive-ag3nt; wire_time already owns the epoch-seconds convention

hive-c0re/src/approvals.rs

@@ -4,11 +4,11 @@
 
 use std::path::Path;
 use std::sync::Mutex;
-use std::time::{SystemTime, UNIX_EPOCH};
 
 use anyhow::{Context, Result, bail};
 use hive_sh4re::{Approval, ApprovalKind, ApprovalStatus};
 use rusqlite::{Connection, OptionalExtension, params};
+use hive_sh4re::wire_time::now_unix;
 
 const SCHEMA: &str = r"
 CREATE TABLE IF NOT EXISTS approvals (
@@ -380,13 +380,6 @@ fn kind_from_str(s: &str) -> Result<ApprovalKind> {
     })
 }
 
-fn now_unix() -> i64 {
-    SystemTime::now()
-        .duration_since(UNIX_EPOCH)
-        .ok()
-        .and_then(|d| i64::try_from(d.as_secs()).ok())
-        .unwrap_or(0)
-}
 
 #[cfg(test)]
 mod tests {