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).

CONTRIBUTING.md

@@ -28,7 +28,7 @@ make build
 
 ```
 cmd/oikos/          Single-binary entry point
-cmd/hermes/         Hermes MCP client gateway
+cmd/nomos/          Nomos MCP client gateway
 internal/           All Go packages
   httpapi/          REST + MCP server (OpenAPI-generated)
   mcp/              MCP tool implementations
@@ -47,7 +47,7 @@ migrations/         Forward-only SQL migrations (TimescaleDB)
 seeds/              Bootstrap YAML: ontology, inventory, policy, knowledge
 compose/            Dockerfiles + Caddy config
 scripts/            Deploy, watchdog, rollback
-hermes/             Hermes config, persona, skills
+nomos/              Nomos config, persona, skills
 .agents/            Agent instruction files + skills
 plans/              Design documents
 docs/adr/           Architecture decision records