Fix Untitled titles: convert all YAML frontmatter to org-style headers

projects/passepartout/architecture/design/foundation/non-negotiable-identity.org

@@ -1,16 +1,8 @@
----
-title: Non-Negotiable Identity
-type: reference
-tags: :passepartout:architecture:
----
-
-* Non-Negotiable Identity
 :PROPERTIES:
-:ID:       0a33bd83-ff3c-4eac-bc97-83eb6702051a
-:ID:       design-identity
-:CREATED:  [2026-05-07 Wed]
-:WEIGHT:  40
+:CREATED:  [2026-06-04 Thu]
 :END:
+#+title: Non-Negotiable Identity
+#+filetags: :passepartout:architecture:
 
 - Pure Common Lisp + Org-mode. No JSON. No YAML. No external databases.
 - Single-address-space memory (Lisp hash tables in RAM — the agent IS the memory).