Add in new command to rename poster and talks

[jonfroehlich]

And in a command to rename posters and talks now that we have a good, standardized naming scheme (standardized here: #839)

This is related to https://github.com/makeabilitylab/makeabilitylabwebsite/blob/master/website/management/commands/rename_person_images.py

[jonfroehlich]

Closing as completed — the rename commands this issue asked for shipped in commit 1e6e991 (Dec 2023, "Adds rename files commands for talks and posters"), ~3 weeks after this issue was filed:

• website/management/commands/rename_talk_files.py
• website/management/commands/rename_poster_files.py

Both were wired into docker-entrypoint.sh, run once on prod, then commented out (the established one-shot pattern).

Beyond the literal ask, the codebase has since moved past the underlying goal in #839 (rename when any relevant field changes, not just authors):

• Artifact.save() checks do_filenames_need_updating() and renames pdf_file, raw_file, and thumbnail inline.
• The authors_changed m2m_changed signal in website/signals.py re-triggers the save once authors are attached (covering the M2M timing gap).

So new and edited talks/posters/publications are normalized automatically going forward.

One caveat worth tracking separately: a review of the 2026-06-14 prod dump shows a chunk of historical data still carries legacy filenames (most notably ~120 talk raw .pptx files, plus ~40 talk PDFs and ~12 publication PDFs) — the one-shots were never fully swept over old data. That backfill, with its link-breakage risk analysis, is now tracked in #1390.