feat(valleywide): drive 3 analysis - 117 GB Hyper-V VHDX lead identified

Drive 3 (12 TB, 11.99 TB used, only 43 GB free) — third VWP backup
rotation drive. Per Mike, all three drives are rotation copies; content
largely overlaps.

Net-new content vs drives 1 and 2:
- D:\WIN7-Orders\Darv-2\VWP1.VHDX (117 GB, 2023-09-01) — Hyper-V disk
  named "VWP1" in a Darv-2 folder. Likely Darv's later workstation.
  Strongest candidate for finding any 2021-2023 source code that
  postdates our 2020-06-09 ORDERS_C.vbp baseline. Not copied.
- D:\WIN7-Orders\WindowsImageBackup\VWIN7-PC\...vhd (22 GB) — Windows
  Image Backup of the VWIN7-PC machine, dated 2023-08-31.
- D:\VWP-FIN\ (~44 GB) — Finance machine backups + RAR archives. Not
  relevant to Orders modernization but useful for QuickBooks context.

SourceSafe search:
- 1224 SourceSafe-related matches but ALL are Visual Studio install
  directories (Microsoft Visual Studio\Common\VSS\) and .SCC sentinel
  files. No srcsafe.ini (actual repository) anywhere on this drive.
  The SourceSafe repo is on a different drive (likely Darv's personal
  drive, not in the office rotation).

Source code:
- No .vbp newer than 2020-06-09 baseline. Same TEST_VWP.vbp scaffold
  from drive 2 (2021-08-16, 810 bytes) present here too.

Updated .gitignore: added *.vhd (was missing — only had *.vhdx).

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

clients/valleywide/.gitignore

@@ -3,6 +3,7 @@
 
 # VM disk images (Darv's dev VM + XP runtime VMs)
 app-modernization/**/*.vdi
+app-modernization/**/*.vhd
 app-modernization/**/*.vhdx
 app-modernization/**/*.vmdk
 app-modernization/**/*.ova