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

THIRD_PARTY_NOTICES.md

@@ -53,6 +53,4 @@ Rules that still apply, because they are about shipped output rather than local
 | OSM blockout | OSM extract and Blosm-generated geometry | ODbL 1.0 for source data | Source attribution above; review ODbL obligations for distributed derived databases. |
 | Terrain and street prototype | USGS 3DEP DEM, OSM data, project scripts | Public domain USGS data; ODbL 1.0 for OSM data | Source manifests in `Geo/manifests/`; review ODbL obligations for distributed derived databases. |
 
-| Hero façade blockout | Project-owned geometry from `Tools/hero_facade_build.py`, dimensions from OSM and the reference photography | Project-owned; ODbL 1.0 applies to the OSM measurements it derives from | Committed with a per-part evidence report (`Art/blender/hero/hero-facade-*.json`) and a position sidecar (`hero-facade.geo.json`). |
-| Street props (candidate reuse) | Sibling project `…/06-games/security-game`, `assets/models/blender_src/*.blend` | Project-owned by the same author | **Not yet imported.** Sources copied to `Art/props/blender_src/` with `Art/props/reuse-manifest.json`; a licence statement is required before any of them ship. |
-
+| Hero façade blockout | Project-owned geometry from `Tools/hero_facade_build.py`, dimensions from OSM and the reference photography | Project-owned; ODbL 1.0 applies to the OSM measurements it derives from | Committed with a per-part evidence report (`Art/blender/hero/hero-facade-*.json`) and a position sidecar (`hero-facade.geo.json`). | | Street props (candidate reuse) | Sibling project `…/06-games/security-game`, `assets/models/blender_src/*.blend` | Project-owned by the same author | **Not yet imported.** Sources copied to `Art/props/blender_src/` with `Art/props/reuse-manifest.json`; a licence statement is required before any of them ship. |