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/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
 		}
 	]
 }