Add project overview with session log

.claude-context/00-overview.md

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+# ad-managed-by-logon — Project Overview
+
+## Purpose
+PowerShell GPO logon script that provides two-way user/computer tracking in Active Directory:
+- Computer object "Managed By" tab -> last logged-in user
+- User object "Notes" field -> last computer used
+
+## Architecture
+Single self-contained PowerShell script (`Set-ComputerManagedBy.ps1`) deployed via GPO User Logon Script to NETLOGON share. No external dependencies — uses AD PowerShell module when available, falls back to ADSI/DirectorySearcher when RSAT is not installed.
+
+## Key Files
+- `Set-ComputerManagedBy.ps1` — the logon script
+- `README.md` — deployment and delegation instructions
+
+## Session Log
+- 2026-09-23 — AD Managed-By Logon Script — Initial build, added Notes field, fixed Unicode encoding for ISE, split error handling so ManagedBy and Notes failures are independent