docs(devlog): add missing devlog entries for Steps 5, 6.3, and Step 6 completion

2026-09-15 11:57:56 -07:00
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+_model: devlog-entry
+---
+schema_version: 1
+---
+title: Step 5 Completion: MVP Verification and Reference Exhibits
+---
+date: 2026-09-14
+---
+author: cgcha
+---
+summary: Finalized the Step 5 MVP with 27 automated tests passing, SciFi-XZBT text argument corrections, and browser verification across reference exhibits.
+---
+tags: step5, mvp, verification, reference-exhibits
+---
+source_commit: 961919e017b196104c0c8b6fe4b6881399831186
+---
+body: |
+  This devlog entry records the completion of the XZBT-NGN Step 5 MVP.
+
+  The implementation establishes a single-exhibit host engine for XZBT Exhibit Contract 5.2/5.3 capable of negotiating sessions, discovering descriptor-driven controls, dispatching set and invoke operations, and displaying incoming capabilities, events, revisions, and protocol errors.
+
+  Key achievements:
+  - **Automated Testing:** All 27 automated unit and integration tests pass cleanly.
+  - **Reference Exhibit Alignment:** SciFi-XZBT argument descriptors were corrected, enabling both text line and AI announcement invocations to execute through the generic operator UI.
+  - **Conformant Behavior:** Haunted House was verified to report conformant values, and Museum Gallery demonstrated compliant contract negotiation.
+  - **Documentation:** Step 5 verification and architecture boundaries are recorded in STEP5-MVP-COMPLETION-REPORT.md.