hive-agent: self-announce boot instead of host-side kick_agent

hive-agent/src/boot_announce.rs

@@ -0,0 +1,47 @@
+//! One-shot startup self-announce: pushes a todo on every harness boot so
+//! the agent gets a "you were just (re)started" notice without the host
+//! having to send one.
+//!
+//! Replaces `hive-c0re`'s old `Coordinator::kick_agent` calls at the tail
+//! of the rebuild and start DAG nodes, which an operator reported as
+//! duplicate restart messages: those fired one broker message per DAG
+//! node, so a single rebuild — always a real
+//! `StopForUpdate` → `Swap` → `RebuildBookkeeping` → `Reconcile` → `Start`
+//! cycle — queued *two* separate restart messages for one actual boot, and
+//! an agent paused for days could rack up dozens more from repeated
+//! host-side sweeps. The harness itself has perfect knowledge of "did a
+//! boot actually happen": it only runs this once, at the top of
+//! `serve_main`. Self-announcing here dedups for free — one todo per real
+//! process start, no host-side bookkeeping needed.
+//!
+//! No first-spawn-vs-restart distinction: every boot gets the same notice
+//! (the old first-spawn message didn't reliably fire anyway, so unifying
+//! the two loses nothing).
+//!
+//! Keyless on purpose: each boot is a genuinely new occurrence, not a
+//! reconciled condition like `disk_watch`'s, so there's nothing to dedup
+//! *against* within one store — `Todos::upsert`'s keyless path always
+//! inserts a fresh row and always reports `changed`, which is exactly
+//! "wake me, this happened" with no extra bookkeeping.
+
+use tokio::sync::Notify;
+
+use crate::todos::Todos;
+
+/// Producing subsystem marker for the boot-announce todo row.
+const SUBSYSTEM: &str = "harness";
+
+/// Push the "you were just (re)started" todo and wake the turn loop.
+/// Best-effort: a store error is logged, never fatal to boot.
+pub fn announce(label: &str, todos: &Todos, wake: &Notify) {
+    let summary = format!(
+        "You were just (re)started. If you were mid-task, check \
+         `/agents/{label}/state/` for your notes and pick up where you left \
+         off — claude's `--continue` session is intact, so prior context is \
+         still in your window."
+    );
+    match todos.upsert(SUBSYSTEM, None, &summary, None, false) {
+        Ok(_) => wake.notify_one(),
+        Err(e) => tracing::warn!(error = ?e, "boot_announce: todo upsert failed"),
+    }
+}

hive-agent/src/main.rs

@@ -9,6 +9,7 @@
 //! Single bin crate: the module tree below (formerly this crate's `lib.rs`,
 //! before lib + bin were collapsed into one) plus the serve loop.
 
+mod boot_announce;
 mod claude_md_watch;
 mod claude_usage_watch;
 mod db_migrate;
@@ -613,6 +614,12 @@ async fn serve_main<S: Surface>(socket: &Path, poll_ms: u64) -> Result<()> {
     };
     tokio::spawn(reminder_timer::run(reminder_store.clone(), local_msg_tx));
     let (todo_wake, todos_store) = spawn_todo_socket(reminder_store.clone(), &bus);
+    // Self-announce this boot as a todo instead of relying on hive-c0re's
+    // old `kick_agent` broker messages — see `boot_announce`'s module doc
+    // for why this is strictly better than a host-side kick.
+    if let Some(store) = &todos_store {
+        boot_announce::announce(&label, store, &todo_wake);
+    }
     if matches!(initial, LoginState::NeedsLogin) {
         login::wait_for_login(
             &claude_dir,