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
+);

drizzle/meta/0001_snapshot.json

@@ -0,0 +1,73 @@
+{
+	"version": "6",
+	"dialect": "sqlite",
+	"id": "16f780a3-a6e7-4810-94bb-fad5c6446ab4",
+	"prevId": "ab03ffcd-9aa5-4b4b-9f38-322acc6899a3",
+	"tables": {
+		"ephemeral_nodes": {
+			"name": "ephemeral_nodes",
+			"columns": {
+				"auth_key": {
+					"name": "auth_key",
+					"type": "text",
+					"primaryKey": true,
+					"notNull": true,
+					"autoincrement": false
+				},
+				"node_key": {
+					"name": "node_key",
+					"type": "text",
+					"primaryKey": false,
+					"notNull": false,
+					"autoincrement": false
+				}
+			},
+			"indexes": {},
+			"foreignKeys": {},
+			"compositePrimaryKeys": {},
+			"uniqueConstraints": {},
+			"checkConstraints": {}
+		},
+		"host_info": {
+			"name": "host_info",
+			"columns": {
+				"host_id": {
+					"name": "host_id",
+					"type": "text",
+					"primaryKey": true,
+					"notNull": true,
+					"autoincrement": false
+				},
+				"payload": {
+					"name": "payload",
+					"type": "text",
+					"primaryKey": false,
+					"notNull": false,
+					"autoincrement": false
+				},
+				"updated_at": {
+					"name": "updated_at",
+					"type": "integer",
+					"primaryKey": false,
+					"notNull": false,
+					"autoincrement": false
+				}
+			},
+			"indexes": {},
+			"foreignKeys": {},
+			"compositePrimaryKeys": {},
+			"uniqueConstraints": {},
+			"checkConstraints": {}
+		}
+	},
+	"views": {},
+	"enums": {},
+	"_meta": {
+		"schemas": {},
+		"tables": {},
+		"columns": {}
+	},
+	"internal": {
+		"indexes": {}
+	}
+}

drizzle/meta/_journal.json

@@ -8,6 +8,13 @@
 			"when": 1750355487927,
 			"tag": "0000_spicy_bloodscream",
 			"breakpoints": true
+		},
+		{
+			"idx": 1,
+			"version": "6",
+			"when": 1755554742267,
+			"tag": "0001_naive_lilith",
+			"breakpoints": true
 		}
 	]
 }