Replace real cluster IPs/hosts/usernames and example names with neutral
placeholders across docs, ops notes, package install text, and the offline
redaction test; delete the obsolete build-time starter prompt. Closes the
portability audit's single blocker. No runtime behavior change.
Rename CLAUDE.md -> AGENTS.md (cross-vendor standard) with a relative
CLAUDE.md symlink so Claude Code still loads it. Move each .claude/rules
file into docs/guides/ (paths: frontmatter preserved) and replace the
rules file with a relative symlink into the guide. Repoint the AGENTS.md
index paragraph at docs/guides/ so non-Claude agents find the guides.