merge: combine KNELServerBuild into PFVCluster

Merge the KNELServerBuild repository (server provisioning, security
hardening, DNS cluster setup, test suite) into PFVCluster (Proxmox
cluster ops, performance tuning, fleet audit). Both histories are
preserved via --allow-unrelated-histories.

The two repos had no source-file collisions; only AGENTS.md and
.gitignore conflicted (both resolved by merging content from both).

Directory reorganization and doc gardening will follow in subsequent
commits.

🤖 Generated with [Crush](https://github.com/charmassociates/crush)

Assisted-by: GLM-5 via Crush <crush@charm.land>

.gitignore

@@ -17,3 +17,19 @@ __pycache__/
 *.tmp
 *.bak
 *.log.tmp
+
+# LOGFILENAME artifacts: the framework (Logging.sh + PrettyPrint.sh) appends
+# every print_info/print_error line to LOGFILENAME, defined as
+# "$0.<Weekday>-YYYY-MM-DD-HH:MM:SS.$$". Running any script that sources the
+# framework therefore drops a timestamped log file next to it.
+*.Monday-*
+*.Tuesday-*
+*.Wednesday-*
+*.Thursday-*
+*.Friday-*
+*.Saturday-*
+*.Sunday-*
+
+# Sensitive exports / runtime data
+dns-cluster-setup/.export/
+returned-logs/