Add approved requirements and progress log

Requirements engineering for iteration 1 is finished (D13); phase 2
(planning and design) starts.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -10,7 +10,8 @@ the headset to Home Assistant in both directions:
 - **Dashboard:** a SteamVR dashboard tab to view and control Home Assistant from inside VR.
 
 > **Status:** early development. The overlay platform works on the Frame; the Home Assistant
-> parts are being planned.
+> parts are being planned; see [docs/REQUIREMENTS.md](docs/REQUIREMENTS.md)
+> and [docs/PROGRESS.md](docs/PROGRESS.md).
 
 ### Platform
 
@@ -114,7 +115,7 @@ VK_DRIVER=lvp scripts/container-test.sh   # same on the lavapipe software driver
 | `tests/` | Unit and render tests |
 | `cmake/` | `vrdash_add_dashboard()`, OpenVR download, Qt bundling, toolchain |
 | `docker/`, `scripts/` | Build containers; build, package, deploy and test scripts |
-| `docs/` | Architecture, Steam Frame notes |
+| `docs/` | Requirements, progress, architecture, Steam Frame notes |
 
 ## License