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

Geo/verification/2026-11-06-elevation.md

@@ -14,13 +14,13 @@ Note: the point service answers in 6–8 s per request, so the probe runs reques
 
 Five positions along the 279.4 m block, at the south sidewalk (12.6 m from the centreline), the road centreline, and the north sidewalk (13.6 m).
 
-| Along block | South sidewalk | Centreline | North sidewalk |
-| ---: | ---: | ---: | ---: |
-| 0.0 m (Orange Dr) | 118.90 | 119.36 | 119.59 |
-| 69.8 m | 118.11 | 118.46 | 118.49 |
-| 139.7 m | 116.95 | 117.41 | 117.50 |
-| 209.5 m | 116.04 | 116.27 | 116.47 |
-| 279.4 m (Highland Ave) | 115.65 | 115.91 | 116.10 |
+|            Along block | South sidewalk | Centreline | North sidewalk |
+| ---------------------: | -------------: | ---------: | -------------: |
+|      0.0 m (Orange Dr) |         118.90 |     119.36 |         119.59 |
+|                 69.8 m |         118.11 |     118.46 |         118.49 |
+|                139.7 m |         116.95 |     117.41 |         117.50 |
+|                209.5 m |         116.04 |     116.27 |         116.47 |
+| 279.4 m (Highland Ave) |         115.65 |     115.91 |         116.10 |
 
 Crossings: Orange Dr 118.96 m, mid-block 117.53 m, Highland 115.95 m.