rename: slopsmith -> feedBack, byron -> got-feedBack

Renames across the entire codebase:
- slopsmith/Slopsmith/SLOPSMITH/SlopSmith -> feedBack/FeedBack/FEEDBACK/FeedBack
- byron/Byron/Byrongamatos -> got-feedBack/got-feedBack/got-feedBack
- /home/byron/ -> /opt/got-feedBack/
- byron@ougsoft.com -> hi@got-feedBack.org
- github.com/byrongamatos/ -> github.com/got-feedback/
- com.byron. -> com.got-feedback.
- SLOPSMITH_ env vars -> FEEDBACK_ with backward-compat fallback
- Protocol/storage strings migrated with read-old/write-new pattern
- window.slopsmith JS API -> window.feedBack (canonical) + backward-compat alias

Refs: #rename-slopsmith

lib/sloppak.py

@@ -22,7 +22,7 @@ import zipfile
 from dataclasses import dataclass, field
 from pathlib import Path
 
-log = logging.getLogger("slopsmith.lib.sloppak")
+log = logging.getLogger("feedBack.lib.sloppak")
 
 # The feedpak format version this build targets / writes (manifest
 # `feedpak_version`, a semver string per spec §4). Readers tolerate any version
@@ -892,6 +892,6 @@ def extract_meta(path: Path) -> dict:
         "arrangements": arrangements,
         "has_lyrics": has_lyrics,
         "stem_count": stem_count,
-        # slopsmith#129: per-stem filter needs the id list, not just count.
+        # feedBack#129: per-stem filter needs the id list, not just count.
         "stem_ids": stem_ids,
     }