feat: overhaul hp_agent lifecycle handling

* Added backoff and liveness probes for better management
* Switched IPC to a simple text based system
* Lookups don't directly touch the agent now
* Use the database as a source of truth

drizzle/0001_naive_lilith.sql

@@ -0,0 +1,5 @@
+CREATE TABLE `host_info` (
+	`host_id` text PRIMARY KEY NOT NULL,
+	`payload` text,
+	`updated_at` integer
+);