Repoint ADR references after HQ consolidated 65 records to 23

96 comments across the two repos named records that no longer exist. Each now
points at the consolidated record that holds its reasoning -- ADR 0034 (a test
defends a decision) is 0017, the eight host records are 0005, the four lab
records are 0016.

Worth noting for next time: these are references from outside HQ, so renumbering
there is not free. It cost 38 files here.

internal/inventory/inventory.go

@@ -3,7 +3,7 @@
 // Reported upward and never asked downward (novox/hq 03-DESIGN/01-to-be/05-the-node-host.md).
 // Everything here is read from the machine at the moment of asking — nothing is remembered,
 // nothing is derived from a file that says what the machine ought to be
-// (novox/hq ADR 0035).
+// (novox/hq ADR 0018).
 package inventory
 
 import (
@@ -39,7 +39,7 @@ type Inventory struct {
 
 	// ObservedAt is when this was read. An inventory with no timestamp cannot be told from a
 	// stale one, and a node that has been unreachable for a week is an ordinary situation
-	// (novox/hq ADR 0036) rather than an error — so the age of the observation is part of it.
+	// (novox/hq ADR 0004) rather than an error — so the age of the observation is part of it.
 	ObservedAt time.Time `json:"observed_at"`
 
 	// Unreadable lists what could not be determined, and why. An absent field and a field that