Switch to filename-based wiki-links (Quartz resolves by filename)

- Convert all wiki-links from title-based to filename-based
- Update doc-links to validate against filenames
- Add doc-filenames task for duplicate filename detection
- Consolidate doc hooks into single local block in pre-commit config

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docs/reference/operations/backup.md

@@ -11,5 +11,5 @@ Daily automated backups of BlumeOps data.
 ## Components
 
 - [[borgmatic]] - Backup orchestration
-- [[sifaka-nas | Sifaka]] - Backup target (NAS)
-- [[backup-policy]] - What gets backed up and retention
+- [[sifaka | Sifaka]] - Backup target (NAS)
+- [[backups | backup-policy]] - What gets backed up and retention

docs/reference/operations/disaster-recovery.md

@@ -8,7 +8,7 @@ tags:
 
 TBD. Current state:
 
-- [[borgmatic]] provides daily backups to [[sifaka-nas | Sifaka]]
+- [[borgmatic]] provides daily backups to [[sifaka | Sifaka]]
 - Infrastructure can be rebootstrapped using the blumeops repo
 - Detailed DR procedures not yet documented
 

docs/reference/operations/observability.md

@@ -12,5 +12,5 @@ Metrics, logs, and dashboards for BlumeOps infrastructure.
 
 - [[prometheus]] - Metrics storage and querying
 - [[loki]] - Log aggregation
-- [[grafana-alloy | Alloy]] - Metrics and log collection
+- [[alloy | Alloy]] - Metrics and log collection
 - [[grafana]] - Dashboards and visualization