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>

examples/envproviders/main.go

@@ -2,8 +2,8 @@
 // (go-llm parity): named providers built entirely from the environment,
 // first-class in Parse, chains, and tiers.
 //
-//	export LLM_M1=foreman://test-token-change-me@foreman-m1.orgrimmar.dudenhoeffer.casa
-//	export LLM_M5=foreman://test-token-change-me@foreman-m5.orgrimmar.dudenhoeffer.casa
+//	export LLM_M1=foreman://test-token-change-me@foreman-m1.example.com
+//	export LLM_M5=foreman://test-token-change-me@foreman-m5.example.com
 //	go run ./examples/envproviders
 package main