docs: public-readiness — vibe-coded disclosure + genericize internal hosts

- README + CLAUDE.md: upfront "this is a vibe-coded project" disclosure for
  going public.
- Replace internal LAN hostnames (*.orgrimmar.dudenhoeffer.casa) with
  example.com across README, ADR-0004, the envproviders example, and env_test.go
  (assertions updated together; suite still green). Token was already a
  "change-me" placeholder, not a real secret.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -5,6 +5,12 @@ target-agnostic model access, a parseable model naming / failover / tiering
 system with health tracking, multimodality, tool calls, structured output,
 and agents composed from model + system prompt + toolboxes + skills.
 
+> **Public, vibe-coded project.** This is built almost entirely by an AI agent
+> (Claude Code) and is public. Keep that framing honest in the README — don't
+> oversell it — and keep the README/support-matrix/examples updated in the same
+> commit as the behavior they describe (that in-sync promise is part of the
+> project's credibility).
+
 **North star:** majordomo exists to re-architect mort's agentic layer. mort
 is the first consumer and the design's acceptance test — when a choice is a
 toss-up, pick what makes mort's tiers, failover chains, toolboxes, and