docs: add .claude-context project overview

.claude-context/00-overview.md

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+# Set-StudentEmail
+
+PowerShell script that bulk-assigns email addresses to student accounts in Active Directory.
+
+**Repository:** https://gitea.hideawaygaming.com.au/jessikitty/Set-StudentEmail
+
+## How it works
+- Scans all users in the student OU (`-OU`)
+- Sets `mail` to `[SamAccountName]@<domain>`, lowercased and trimmed
+- Skips users that already have an address unless `-Force`
+- `-WhatIf` previews without changes
+
+## Related
+- `Staff-AD-email-disabler` — the equivalent daily workflow for staff accounts
+
+## Session Log
+- 2026-05-15 — Bulk Student Email Assignment Script — Created script; switched from name-based to username-based addresses for uniqueness
+
+---
+*Created by: Jess Rogerson (yelling commands at Claude.AI)*