docs: add ADR-0038/0039 and replace llm-workflows references with decomposed repos

- ADR-0038: Infrastructure metrics collection (smartctl, SNMP, blackbox, unpoller)
- ADR-0039: Alerting and notification pipeline (Alertmanager → ntfy → Discord)
- Replace llm-workflows GitHub links with Gitea daviestechlabs org repos
- Update AGENT-ONBOARDING.md: remove llm-workflows from file tree, add missing repos
- Update ADR-0006: fix multi-repo reference
- Update ADR-0009: fix broken llm-workflows link
- Update ADR-0024: mark ray-serve repo as created, update historical context
- Update README: fix ADR-0016 status, add 0038/0039 to table, update badges

decisions/0006-gitops-with-flux.md

@@ -35,7 +35,7 @@ Chosen option: "Flux CD", because it provides a mature GitOps implementation wit
 * Git is single source of truth
 * Automatic drift detection and correction
 * Native SOPS/Age secret encryption
-* Multi-repository support (homelab-k8s2 + llm-workflows)
+* Multi-repository support (homelab-k8s2 + Gitea daviestechlabs repos)
 * Helm and Kustomize native support
 * Webhook-free sync (pull-based)
 
@@ -79,8 +79,10 @@ spec:
   # Public repos don't need secretRef
 ```
 
-Note: The monolithic `llm-workflows` repo has been decomposed into separate repos
-in the daviestechlabs Gitea organization. See AGENT-ONBOARDING.md for the full list.
+Note: The monolithic `llm-workflows` repo has been archived and decomposed into
+focused repos in the daviestechlabs Gitea organization (e.g. `chat-handler`,
+`voice-assistant`, `handler-base`, `ray-serve`, etc.). See AGENT-ONBOARDING.md
+for the full list.
 
 ### SOPS Integration