Follows 720e14d0 (canonical roots + catalog regen). Sweeps the rename through the
authored layer that the catalog generators don't own, and corrects the release
artifacts:

Authored text (hand-fixed): backlog.md, release_priority.md, manifeste/calendar.md
(setlist mentions); master_edl_take89.json (boundary name + bleed reason — Take89
is the Montreuil set); boundaries_take89_validated.json (ear-validated cut-6
label). Regenerated from those: boundary_bleed_take89.json. Found+fixed a
hardcoded SETLIST in punkachien/build_stemmap_html.py (the name was baked into the
generator, not read from data) and regenerated stemmap.html.

Release masters (#29 + #22): retagged all 15 FLACs in
Prod/Montreuil26_master/tracks_bandcamp/ — album → "Montreuil Algorave V3 — Mai
Floral" (the CANONICAL tracks.json title; the old tag said "…V3 — Live@Les
Nouveaux Sauvages", a venue string not the set title). Track 08 title →
"Mafia Sans Serif" and file renamed 08-Aria_Sans_Serif.flac →
08-Mafia_Sans_Serif.flac. (Prod is plain files, not git — FLACs are the artifact.)

Deliberately NOT touched: sources/soundcloud.jsonl is an EXTERNAL MIRROR of the
published SC upload (which itself still reads "Aria Sans Serif" + "Montreuil
Algorave III") — editing it would desync it from reality; the real fix is
publish-side (tracked as a follow-up). eda_report.json carries the name as a
cosmetic label and is freebox-EDA-gated — it refreshes on the next EDA pass, not
worth an expensive regen now. The hexa public-audio copy of the FLACs is a
downstream sync (Shipow's repo) — flagged, not edited here.