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/manifests/local-origin.md

@@ -38,7 +38,7 @@ Reproduce it the same way, or with `pyproj` once a geo environment exists. If a
 Optional check values, all NAD83 / UTM 11N, and the same points as local X/Y relative to the origin. Use them to confirm a transformation before trusting a blockout.
 
 | Point | WGS84 lat, lon | Easting | Northing | Local X | Local Y |
-| --- | --- | ---: | ---: | ---: | ---: |
+| --- | --- | --: | --: | --: | --: |
 | Hollywood × Orange Dr | 34.101543, −118.341749 | 376 235.784 | 3 774 227.529 | −279.605 | +3.446 |
 | **Origin: Hollywood × Highland** | 34.101545, −118.338718 | **376 515.389** | **3 774 224.083** | 0.000 | 0.000 |
 | Hero NW corner | 34.101412, −118.340299 | 376 369.380 | 3 774 211.202 | −146.009 | −12.881 |
@@ -53,10 +53,10 @@ Note the sign pattern: the whole block lies at **negative X** and the hero at **
 
 ## Axis convention
 
-| Axis | Meaning |
-| --- | --- |
-| Local X | easting − origin easting, metres, east positive |
-| Local Y | northing − origin northing, metres, north positive |
+| Axis    | Meaning                                                      |
+| ------- | ------------------------------------------------------------ |
+| Local X | easting − origin easting, metres, east positive              |
+| Local Y | northing − origin northing, metres, north positive           |
 | Local Z | up, metres, elevation relative to the origin's ground height |
 
 The block then spans roughly **X −279 m to 0 m**, Y a few tens of metres either side, which keeps float precision comfortable in Unreal.