ADR-012: track log-storage allocation + SSD wearout (ADR-018)

docs/decisions/012-hardware-capacity.md

@@ -36,5 +36,9 @@ workload that should move, or a node due an upgrade.
 - Right-sizing advice is intent-based until usage data exists; reports say so.
 - `reference.md` table headers are a parser contract — changing them needs a
   matching `capacity-scan.py` change.
+- Log storage (ADR-018) is a tracked allocation: the cluster Loki host's retention
+  budget and `askari`'s security-subset volume belong in `reference.md`, and SSD
+  **wearout/TBW** is a monitored metric — logging is write-heavy, so wear is watched,
+  not assumed.
 
 See also: ADR-001 (architecture), ADR-007 (network), ADR-009 (TF ↔ Ansible handoff).