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

PLAN.md

@@ -55,9 +55,7 @@ Progress lives in `ROADMAP.md`; session findings live in `MEMORY.md`; rendered r
 - `Tools/` — repeatable import/export helpers.
 - `Docs/` — setup, licenses, architecture, release checks.
 
-Track `.uasset`, `.umap`, `.blend`, and large source binaries with LFS.
-Ignore generated `Binaries/`, `Intermediate/`, `Saved/`, and Derived Data Cache.
-Do not commit Unreal Engine source, credentials, or non-redistributable assets.
+Track `.uasset`, `.umap`, `.blend`, and large source binaries with LFS. Ignore generated `Binaries/`, `Intermediate/`, `Saved/`, and Derived Data Cache. Do not commit Unreal Engine source, credentials, or non-redistributable assets.
 
 ## Geographic and Art Pipeline
 
@@ -101,7 +99,7 @@ Driving, interiors, crowds, traffic simulation, multiplayer, and a full-city map
 Solo-development estimate: **approximately 30–40 weeks**, subject to asset quality and available hours.
 
 | Release | Weeks | Larger task | Small patch tasks after release |
-| --- | ---: | --- | --- |
+| --- | --: | --- | --- |
 | `0.1.0` | 1–6 | Local setup and initial walkable Hollywood block | `0.1.1` collision fixes; `0.1.2` scale/façade corrections; `0.1.3` packaging and setup fixes |
 | `0.2.0` | 7–9 | MPFB player body, third-person camera, basic animation | `0.2.1` rig fixes; `0.2.2` skin/hair tuning; `0.2.3` camera clipping fixes |
 | `0.3.0` | 10–13 | One Chaos vehicle, enter/exit interaction, closed driving route | `0.3.1` handling tuning; `0.3.2` vehicle collision fixes; `0.3.3` input fixes |