docs: align runbooks and validation structure

AGENTS.md

@@ -2,8 +2,6 @@
 
 This repo is the **agent ops handbook + fact source** for maintaining personal VPS hosts. Prefer verifying live state over assuming docs are complete.
 
-Also readable as `agent.md` (symlink → this file).
-
 ## How to work
 
 1. Read [`inventory/hosts.md`](inventory/hosts.md) for the machine list.
@@ -125,7 +123,8 @@ Default triage labels: needs-triage, needs-info, ready-for-agent, ready-for-huma
 
 ### Domain docs
 
-Single-context layout: `CONTEXT.md` + `docs/adr/` at the repo root. See `docs/agents/domain.md`.
+Domain-documentation conventions, including lazily created `CONTEXT.md` and
+`docs/adr/` entries when needed, are described in [`docs/agents/domain.md`](docs/agents/domain.md).
 
 ## Safety
 
@@ -158,7 +157,7 @@ Bills, rough notes, and personal clutter stay in the Obsidian vault. This repo h
 ## Layout
 
 ```
-AGENTS.md / agent.md   # this entry (agent.md → AGENTS.md)
+AGENTS.md              # this entry
 RUNBOOKS.md            # runbook spec (six-field model, naming, review rules)
 inventory/hosts.md     # machine index (human-readable source of truth)
 ansible/               # playbooks, roles, sanitized control-plane inventory