N0: rename Hermes → Nomos (standalone commit)

Problem: "Hermes" collides with Nous Researchs unrelated product;
  unclear identity for the resident agent.

  Change: Rename the live service identity across 39 files:
  - cmd/hermes/ → cmd/nomos/ (binary, env vars NOMOS_*)
  - internal/config/ server.go (NomosAgentSlug, nomosAgentID)
  - compose/hermes/ → compose/nomos/ (Dockerfile, service name)
  - hermes/ → nomos/ (SOUL.md, config.yaml, skills/)
  - .agents/HERMES.md → NOMOS.md (persona)
  - tools/setup-hermes-soul.sh → setup-nomos-soul.sh
  - seeds/inventory.yaml (agent:hermes → agent:nomos)
  - migrations/014_rename_agent_hermes_to_nomos.up.sql
  - Caddy vhost hermes.hubris.network → nomos.hubris.network
  - All referencing docs, scripts, ADR notes

  History preserved: archive/, plans/done/, ADRs not rewritten.
  Matrix @hermes notifier account and Legacy bin/hermes on LXC 129
  intentionally untouched (out of scope).

  Risk: N0 is identity-only rename; zero behavioral changes.
  Verification: go build ./... passes; docker compose --profile full
  resolves nomos service; grep -ri hermes (excluding archive/plans)
  returns only intentional refs (LLM model name, Matrix user).

inventory.yaml

@@ -511,7 +511,7 @@ hosts:
       192.168.8.0/24. Re-enroll in mesh as a follow-up if off-LAN access
       to this host itself (not just its future guests) is needed.
     - First step of the planned library-SSD migration — see
-      .hermes/plans/2026-06-03_110000-library-ssd-migration-to-ludo-mini.md
+      .nomos/plans/2026-06-03_110000-library-ssd-migration-to-ludo-mini.md
       (filename kept as-is, it's a historical planning doc). Only Phase 1
       (Proxmox install + cluster join) is done; no physical
       drive move, service migration, or GPU passthrough has happened yet.
@@ -555,7 +555,7 @@ archaeology:
     kind: lxc
     pve_id: 123
     destroyed: 2026-06-04
-    reason: replaced by Hermes Agent on mac-mini; monitoring moved to homelab-health-watchdog cron
+    reason: replaced by Nomos Agent on mac-mini; monitoring moved to homelab-health-watchdog cron
   plato:
     kind: lxc
     pve_id: 126