docs(research): canonical retail keymap + dump-keymap tool

Pre-Phase K research artifact. Captures the AC retail default keymap
in two complementary forms so the upcoming InputAction enum + retail
preset (Phase K.1c) can be built byte-precise.

- docs/research/named-retail/retail-default.keymap.txt — verbatim
  copy of the user's test.keymap from
  ~/Documents/Asheron's Call/. Human-readable text format with
  every binding categorized: MovementCommands (W/X/A/D/Z/C/Q/Space/
  LShift/S + Y/G/H/B postures), ItemSelectionCommands (F/T/P + 18
  punctuation keys for compass/item/monster/player/fellow targeting),
  UICommands (F1-F12 panel toggles, R=USE, E=Examine, Esc=close,
  Shift+Esc=Logout), QuickslotCommands (1-9 + Ctrl/Alt variants for
  hotbar pages), Combat / MeleeCombat / MissileCombat / MagicCombat
  (mode-dependent Insert/PgUp/Delete/End/PgDn), Emotes
  (U=Cry, I=Laugh, J=Wave, O=Cheer, K=Point), CameraControls (numpad
  cluster), MouseCommands, ScrollableControls, EditControls,
  CopyAndPasteControls, DialogBoxes. 346 lines.

- docs/research/named-retail/keymap-default.txt — binary dump of
  the gmDefaultMap MasterInputMap from client_portal.dat at file id
  0x14000000. Decoded via the new tools/dump-keymap utility:
  scancodes + modifier flags + action IDs + activation phase per
  context. Confirms the text file's bindings against the dat-shipped
  default. Cross-referenced against
  acclient_2013_pseudo_c.txt:405510 (ACCmdInterp::OnAction) for the
  movement dispatch logic and :365889 (CPlayerSystem::OnAction) for
  the targeting dispatch.

- tools/dump-keymap/ — dotnet console tool referencing
  references/DatReaderWriter. Reads MasterInputMap entries from a
  dat directory + emits human-readable per-context binding tables.
  Reusable for future custom keymap analysis. Run with:
    dotnet run --project tools/dump-keymap/dump-keymap.csproj -c Release
  Default dat dir is %USERPROFILE%/Documents/Asheron's Call.

Foundation for Phase K — control system overhaul. Plan documented at
~/.claude/plans/ticklish-conjuring-cake.md.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tools/dump-keymap/dump-keymap.csproj

@@ -0,0 +1,13 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net10.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <LangVersion>latest</LangVersion>
+    <RootNamespace>DumpKeymap</RootNamespace>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\references\DatReaderWriter\DatReaderWriter\DatReaderWriter.csproj" />
+  </ItemGroup>
+</Project>