_model: devlog-entry
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schema_version: 1
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title: Post Step 4 Completion
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date: 2026-09-14
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author: cgcha
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summary: Commit and publish all Step 4 artifacts, including documentation, source files, and test fixtures.
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tags: step4, completion, documentation
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source_commit: 446bf3533e7dac34045a4f9ebdc4a9d34475ba5e
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body: |
  This devlog entry records the commit that finalised Step 4 of the XZBT‑NGN exhibit project. The commit adds the following new files:

  - STEP4‑INDEPENDENT‑REVIEW.md
  - STEP4‑MVP‑REPORT.md
  - Documentation under `docs/` covering the implementation plan, authoring guide, and contract specification.
  - Package configuration (`package.json`) and public web assets.
  - Server and client source code under `server/` and `src/`.
  - Comprehensive test fixtures and test suites under `test‑fixtures/` and `tests/`.

  All modified files (`AGENTS.md`, `README.md`) were updated to reflect the latest project state. The commit was authored as part of the Step 4 milestone and is tagged accordingly.