Import march-2020-03-10 from private repo (scrubbed 2026-05-27)

Targets Rec Room 2020.03.10 client (also serves 2020.03.06).

Re-import after adding:
- DorkNet.ClientMod/dorknet-clientmod.json.template — config schema
  the launcher's manifest-driven patcher renders into UserData/.
- tools/build-patcher-zip.ps1 — produces dorknet-clientpatch-{key}.zip
  for v1-march-* Release uploads.
- .github/workflows/release.yml — on tag push publishes both
  dorknet-server-march_2020_03_10-win-x64.zip and
  dorknet-clientpatch-march_2020_03_10.zip as Release assets.

Same scrub rules as december; tools/build-patcher-zip.ps1 added to
the maintainer-side allow-list so it survives.

DorkNet.Server/Controllers/Discovery/DiscoveryController.cs

@@ -0,0 +1,30 @@
+using Microsoft.AspNetCore.Mvc;
+using DorkNet.Server.Services;
+
+namespace DorkNet.Server.Controllers.Discovery;
+
+/// <summary>
+/// discovery.{rec.net,localhost} — the watch's room-discovery surface
+/// (rooms tab "For You" feed). Backed by the same RoomService used
+/// elsewhere so what's hot here matches the main browser.
+/// </summary>
+[ApiController]
+public class DiscoveryController(RoomService rooms) : ControllerBase
+{
+    [HttpGet("/discover/v2/rooms")]
+    public async Task<IActionResult> GetRooms([FromQuery] string? tag, [FromQuery] int take = 50)
+        => Ok((await rooms.HotAsync(tag, Math.Clamp(take, 1, 100)))
+            .Select(RoomService.ToWireRoom).ToList());
+
+    [HttpGet("/discover/v2/feed")]
+    public async Task<IActionResult> GetFeed([FromQuery] int take = 50)
+        => Ok((await rooms.HotAsync(null, Math.Clamp(take, 1, 100)))
+            .Select(RoomService.ToWireRoom).ToList());
+
+    [HttpGet("/discover/v2/featured")]
+    public async Task<IActionResult> GetFeatured([FromQuery] int take = 50)
+        // Featured = tagged "featured" — same set as the watch's
+        // primary "Featured" filter chip.
+        => Ok((await rooms.HotAsync("featured", Math.Clamp(take, 1, 100)))
+            .Select(RoomService.ToWireRoom).ToList());
+}