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

docs/benchmarks/note_detect_v2/BENCHMARK.md

@@ -1,4 +1,4 @@
-# Slopsmith Note Detect Benchmark — v2
+# FeedBack Note Detect Benchmark — v2
 
 A slower-paced companion to v1, focused on what players can actually
 land cleanly. Half-note spacing throughout (~1.33 s between events at

docs/benchmarks/note_detect_v2/build_benchmark.py

@@ -16,11 +16,11 @@ Goals vs v1:
   technique handling is the next algorithm focus, separate from
   measuring "do basic single notes + chords score correctly?"
 
-How to run inside the slopsmith container:
+How to run inside the feedBack container:
 
     docker cp docs/benchmarks/note_detect_v2/build_benchmark.py \\
-              slopsmith-web-1:/tmp/build_benchmark_v2.py
-    docker exec slopsmith-web-1 python /tmp/build_benchmark_v2.py \\
+              feedBack-web-1:/tmp/build_benchmark_v2.py
+    docker exec feedBack-web-1 python /tmp/build_benchmark_v2.py \\
               /app/static/sloppak_cache/note_detect_benchmark_v2.sloppak
 
 After regenerating, copy the zip output to the tracked path with the
@@ -375,7 +375,7 @@ def build(out_dir: Path):
 
     manifest = {
         'title': 'Note Detect Benchmark v2',
-        'artist': 'Slopsmith',
+        'artist': 'FeedBack',
         'album': 'Note Detection Benchmark',
         'year': 2026,
         'duration': round(end_t, 3),
@@ -392,7 +392,7 @@ def build(out_dir: Path):
             {'id': 'full', 'file': 'stems/full.ogg', 'default': True},
         ],
         'benchmark': {
-            'id': 'slopsmith-note-detect-benchmark',
+            'id': 'feedBack-note-detect-benchmark',
             'version': 2,
         },
     }
@@ -466,7 +466,7 @@ def _build_zip(src_dir: Path):
 
 
 def _benchmark_readme(duration_s):
-    return f"""# Slopsmith Note Detect Benchmark — v2
+    return f"""# FeedBack Note Detect Benchmark — v2
 
 A slower-paced companion to v1, focused on what players can actually
 land cleanly. Half-note spacing throughout (~1.33 s between events at