vigil: Janet plugin bridge and hooks (slice 4 of 5)

Expose vigil/* Janet functions (live?, emit, list, get, set-state) to
plugins via a process-global OnceLock bridge in the plugin worker, and
register the three vigil lifecycle hooks (on-vigil-event, on-vigil-reap,
on-vigil-observance) in the loader. The keeper's plugin event channel is
installed into the bridge at startup so (vigil/emit ...) reaches the
keeper router across the worker/runtime thread boundary.

Author: allen-munsch

src/main.rs

@@ -2138,6 +2138,17 @@ async fn main() -> anyhow::Result<()> {
                             (None, None, None, None, None)
                         } else {
                             let n = keeper.vigils.len();
+                            #[cfg(feature = "plugin")]
+                            {
+                                if let Some(ref vig_tx) = keeper.vigil_plugin_tx {
+                                    crate::plugin::worker::vigil_bridge::install_vigil_tx(
+                                        vig_tx.clone(),
+                                    );
+                                }
+                                let names: Vec<String> =
+                                    keeper.vigils.iter().map(|v| v.name.clone()).collect();
+                                crate::plugin::worker::vigil_bridge::install_vigil_names(names);
+                            }
                             eprintln!("info: vigil-keeper started with {n} vigil(s)");
                             let wake = keeper.wake_rx.take();
                             let obs = keeper.observance_rx.take();

src/plugin/loader.rs

@@ -37,6 +37,10 @@ pub const HOOK_NAMES: &[&str] = &[
     // ctx :messages (JSON); may call harness/set-compact-summary to
     // supply a summary instead of the LLM summarizer.
     "on-compact",
+    // --- vigil hooks (dirge-vigil) ---
+    "on-vigil-event",
+    "on-vigil-reap",
+    "on-vigil-observance",
 ];
 
 /// Filter an input candidate list to only paths that exist as