Add COM registration verification script

Test-ComRegistration.ps1 registers all 10 COM server DLLs via regasm
and verifies all 50 CLSIDs appear in the registry. Supports -Build
to compile first and -Unregister to clean up. Checks both native and
WOW6432Node registry paths for 32-bit COM on 64-bit Windows.

Result: 50/50 CLSIDs pass, 0 GUID mismatches vs original Decal.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/plans/2026-02-08-com-registration-test.md

@@ -0,0 +1,111 @@
+# COM Registration Test - Implementation Plan
+
+> **For Claude:** REQUIRED SUB-SKILL: Use superpowers:executing-plans to implement this plan task-by-task.
+
+**Goal:** Verify all 10 COM server DLLs register correctly with regasm and their CLSIDs match the original Decal v2.9.8.3.
+
+**Architecture:** Build a PowerShell verification script that: (1) registers each DLL with regasm, (2) queries the registry for expected CLSIDs, (3) reports pass/fail per GUID. We also cross-reference our [Guid] attributes against the original .rgs files from source_checkout.
+
+**Tech Stack:** regasm.exe (.NET Framework 4.x), PowerShell, Windows Registry
+
+---
+
+### Task 1: Cross-Reference GUIDs Against Original .rgs Files
+
+**Files:**
+- Read: `source_checkout/Decal/*.rgs` (original ATL registry scripts)
+- Read: `source_checkout/DecalControls/*.rgs`
+- Read: `source_checkout/DecalFilters/*.rgs`
+- Read: `source_checkout/DecalInput/*.rgs`
+- Read: `source_checkout/DecalNet/*.rgs`
+- Read: `source_checkout/DecalDat/*.rgs`
+- Read: All `*Impl.cs` files in `reconstructed/Managed/Decal.*/`
+
+**Step 1: Extract GUIDs from .rgs files**
+Parse each .rgs file for CLSID patterns like `{XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}`.
+
+**Step 2: Extract GUIDs from our [Guid("...")] attributes**
+Grep all Impl.cs files for Guid attributes.
+
+**Step 3: Compare and report mismatches**
+Any GUID in our code that doesn't match the original .rgs is a critical bug.
+
+---
+
+### Task 2: Write the COM Registration Test Script
+
+**Files:**
+- Create: `reconstructed/tools/Test-ComRegistration.ps1`
+
+**Step 1: Write PowerShell script**
+
+The script should:
+1. Find regasm.exe (32-bit .NET Framework 4.x)
+2. Build the solution if needed
+3. Register each of the 10 DLLs with `regasm /codebase`
+4. Query registry for each expected CLSID at `HKCR\CLSID\{GUID}\InprocServer32`
+5. Verify the registered DLL path points to our built assembly
+6. Report pass/fail per DLL and per GUID
+7. Optionally unregister with `regasm /unregister`
+
+**Step 2: Run the script**
+
+```powershell
+powershell -ExecutionPolicy Bypass -File reconstructed/tools/Test-ComRegistration.ps1
+```
+
+Expected: All 55 CLSIDs register and appear in registry.
+
+**Step 3: Commit**
+
+```bash
+git add reconstructed/tools/Test-ComRegistration.ps1
+git commit -m "feat: add COM registration verification script"
+```
+
+---
+
+### Task 3: Run Registration and Fix Any Issues
+
+**Step 1: Execute registration**
+Run regasm on each DLL and capture output.
+
+**Step 2: Investigate any failures**
+Common issues:
+- Missing dependencies (Interop DLLs not in same directory)
+- x86 vs x64 regasm mismatch
+- Missing ComVisible or Guid attributes
+
+**Step 3: Fix and re-test until all pass**
+
+**Step 4: Commit fixes**
+
+---
+
+### Task 4: Unregister and Document Results
+
+**Step 1: Run unregister to clean up**
+```powershell
+regasm /unregister Decal.DecalDat.dll
+```
+
+**Step 2: Verify CLSIDs are removed from registry**
+
+**Step 3: Document results in a test report**
+
+---
+
+## DLL-to-GUID Reference (55 CLSIDs across 10 DLLs)
+
+| DLL | Classes | CLSIDs |
+|-----|---------|--------|
+| Decal.DecalDat.dll | 3 | DatService, DatStream, DatLibrary |
+| Decal.DHS.dll | 2 | HotkeySystem, Hotkey |
+| Decal.SpellFilter.dll | 3 | Spells, Spell, Component |
+| Decal.DecalInput.dll | 6 | InputService, Hotkey, WndMsg, WinMsgHook, Timer, InputBuffer |
+| Decal.DecalNet.dll | 2 | NetService, WebRequest |
+| Decal.DecalFilters.dll | 7 | World, WorldObject, WorldIterator, CharacterStats, EchoFilter, EchoFilter2, Prefilter |
+| Decal.Core.dll | 4 | DecalCore, ACHooks, PluginSite2, DecalEnum |
+| Decal.DecalControls.dll | 17 | Checkbox, List, StaticText, Choice, Progress, FixedLayout, BorderLayout, PageLayout, TextColumn, IconColumn, CheckColumn, DerethMap, Edit, Scroller, PushButton, Notebook, Slider |
+| Decal.DecalRender.dll | 4 | RenderService, HUDBackground, HUDView, RenderTargetWrapper |
+| Decal.D3DService.dll | 2 | D3DService, D3DObj |