fix(encoding-types): restore fallback true on observation frontmatter

Author: cursoragent

odd/encoding-types/observation.md

@@ -12,6 +12,7 @@ date: 2026-04-30
 derives_from: "canon/definitions/dolcheo-vocabulary.md, docs/architecture/encode-architecture-problem-and-gaps.md, canon/principles/prompt-over-code.md"
 complements: "odd/encoding-types/decision.md, odd/encoding-types/learning.md, odd/encoding-types/constraint.md, odd/encoding-types/handoff.md, odd/encoding-types/open.md, odd/encoding-types/encode.md, odd/encoding-types/how-to-write-encoding-types.md, odd/encoding-types/serialization-format.md"
 governs: "oddkit_encode parsing and quality scoring for type O"
+fallback: true
 status: active
 ---