chore: adopt Corestack project standards

Adopt ADRs-only documentation policy, compact base and Go rules, comment lint and TODO checks.

Always validate records with the local docs checker. Skip implementation CI for root Markdown and docs-only changes while retaining coverage for embedded templates and future modules.

.golangci.yml

@@ -0,0 +1,12 @@
+version: "2"
+linters:
+  default: none
+  enable:
+    - revive
+  settings:
+    revive:
+      rules:
+        - name: exported
+        - name: package-comments
+  exclusions:
+    presets: []