docs: add session log for student email assignment script

.claude-context/sessions/2026-05-15-student-email-assignment.md

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+# Bulk Student Email Assignment Script
+
+**Date:** 2026-05-15
+**Project:** Set-StudentEmail
+**Status:** resolved
+**Tags:** powershell, active-directory, email, students, bulk-update
+
+## Context
+Student accounts in AD needed their `mail` attribute populated consistently so downstream systems had a reliable address per student. Jess wanted a script that walks the student OU and assigns every account an address derived from its AD username, with a safe preview mode.
+
+## Key Decisions
+- **`[SamAccountName]@<domain>` format** — the first version built addresses from firstname + surname, but this was switched the same day to the username. Username-based addresses are guaranteed unique and don't break on duplicate names, hyphenated/multi-part surnames, or name changes.
+- **Lowercase and trimmed** — avoids case-mismatch and stray whitespace from imported usernames.
+- **Don't overwrite by default** — existing addresses are left alone unless `-Force` is passed, so manually-corrected addresses aren't clobbered.
+- **`-WhatIf` as the recommended first run** — preview before touching AD.
+- **OU and domain as parameters with defaults** — defaults suit the school, but the script can be pointed elsewhere.
+
+## Technical Details
+- Script: `Set-StudentEmail.ps1`
+- Parameters: `-OU` (DN of student OU; default `<redacted>`), `-Domain` (default `<redacted>`), `-Force`, `-WhatIf`.
+- Requires the ActiveDirectory module and rights to modify user attributes in the target OU; run from a domain-joined machine or via `Enter-PSSession` to a DC.
+
+## Code Changes
+- `Set-StudentEmail.ps1` — new; OU scan, address build, skip/overwrite logic, WhatIf support. Later changed from name-based to username-based addresses.
+- `README.md` — full usage docs and examples; updated for `[username]@domain` format.
+
+## Open Questions / Next Steps
+- Not scheduled — currently run manually. Could be folded into the enrolment/AD sync workflow so new students get addresses automatically.
+- No log file output; consider writing a change log like `Staff-AD-email-disabler` does if it becomes a scheduled task.
+
+## Artifacts
+- `3d231b7` — Change email format to [username]@domain
+- `420a964` — Add Set-StudentEmail script
+- Repo: https://gitea.hideawaygaming.com.au/jessikitty/Set-StudentEmail