docs: convert all architecture .adoc sections to markdown, prettier-format all .md

- Converted 13 individual .adoc section files to .md via
  asciidoctor→docbook5→pandoc(gfm) + post-processing, placed alongside
  the .adoc sources in Docs/Architecture/
- Rebuilt architecture.md from the individual section .md files
- Ran prettier --write on all .md in the repo (23 files changed):
  normalised table column alignment, trailing whitespace, line breaks
- Added .agents/ to .prettierignore (vendored third-party content)
- All .md now passes prettier --check

Docs/Architecture/07_deployment_view.md

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+# Deployment View
+
+## Infrastructure Level 1 — Development Workstation
+
+| Node | Specification |
+| --- | --- |
+| Dev workstation | Bazzite Linux 45 (Fedora 45 base, immutable ostree), Ryzen 7 7700X, 64 GB RAM, RTX 5070 Ti 16 GB, Vulkan RHI |
+| Engine install | `/run/media/system/DATA/Engines/UE_5.8.4` (73 GiB, external to repo) |
+| Project repo | `/run/media/system/DATA/Documents/06-games/gig-line` (Git + LFS, remote at `git.allucanget.biz`) |
+| Build output | `/run/media/system/DATA/Builds/GigLine` (packaged Linux build, ~1.1 GiB) |
+
+Motivation  
+Single-machine development. No build farm, no CI pipeline yet. The engine, toolchain, and GPU are all on the same host.
+
+Quality and Performance Features
+
+- Vulkan RHI on RTX 5070 Ti, open kernel module driver 615.78.08.
+
+- System clang 23.1.4 (no bundled engine clang) compiles game code.
+
+- Build time: ~90 s incremental, ~5 min clean for the editor target.
+
+Mapping of Building Blocks to Infrastructure
+
+| Building Block | Infrastructure Element |
+| --- | --- |
+| Gameplay (C++) | Dev workstation — compiled to `libUnrealEditor-GigLine.so`, loaded by engine |
+| Site + Façades (UE content) | Dev workstation — `.uasset`/`.umap` in `Game/GigLine/Content/` |
+| Art Pipeline (Python/Blender) | Dev workstation — headless Blender 5.2 Flatpak, Python 3.14.8 |
+| QA & Review | Dev workstation — game run in `-game` mode, PNGs to `Screenshots/` |
+| Git remote | `git.allucanget.biz` — Gitea instance, LFS-enabled |
+
+## Infrastructure Level 2 — Packaged Build
+
+| Element | Detail |
+| --- | --- |
+| Linux packaged build | Development config, ~1.1 GiB. Contains engine binaries, game module, cooked content, no editor. |
+| Run command | `./GigLine.sh -windowed -ResX=2560 -ResY=1440` |
+
+No server infrastructure. The game is a standalone executable.