docs(reference): import Dune: Awakening server-manager references

Phase 2 references for the host-agent Dune adapter, moved out of volatile /tmp
into docs/reference-repos/ (per Commander). Three upstream projects, .git +
node_modules + compiled binaries stripped (16MB source). Nested AI-instruction
files (.claude/, CLAUDE.md) removed so they don't pollute Corrosion sessions.

- icehunter/    dune-admin (Go+React) — 4 control planes; SETUP_DOCKER.md is the
                closest analog to our agent's Dune docker control plane (compose
                lifecycle, docker logs, RabbitMQ-via-exec, dune Postgres schema)
- adainrivers/  Rust/Tauri desktop — SSH+k8s BattleGroup control, maintenance
                daemon, in-game admin console (Rust idiom reference)
- the4rchangel/ Node web UI replacing battlegroup.bat — matches the Commander's
                Hyper-V self-host path + game-config schema

See docs/reference-repos/README.md for the full index + how we use each.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docs/reference-repos/icehunter/cmd/dune-admin/helpers.go

@@ -0,0 +1,36 @@
+package main
+
+import (
+	"strings"
+	"time"
+)
+
+// parseDurString parses a duration string (e.g. "5m0s") falling back to def.
+func parseDurString(s string, def time.Duration) time.Duration {
+	if s == "" {
+		return def
+	}
+	d, err := time.ParseDuration(s)
+	if err != nil || d <= 0 {
+		return def
+	}
+	return d
+}
+
+func shellQuote(s string) string {
+	return "'" + strings.ReplaceAll(s, "'", "'\\''") + "'"
+}
+
+// shortClass strips the UE class path prefix and _C suffix from an actor class name.
+func shortClass(s string) string {
+	if idx := strings.LastIndex(s, "/"); idx >= 0 {
+		s = s[idx+1:]
+	}
+	s = strings.TrimSuffix(s, "_C")
+	replacer := strings.NewReplacer(
+		"BP_DunePlayerCharacter", "PlayerCharacter",
+		"BP_DunePlayerController", "PlayerController",
+		"DunePlayerState", "PlayerState",
+	)
+	return replacer.Replace(s)
+}