diff --git a/web/notes/bf-1pc.md b/web/notes/bf-1pc.md
new file mode 100644
index 0000000..a5b5704
--- /dev/null
+++ b/web/notes/bf-1pc.md
@@ -0,0 +1,21 @@
+# bf-1pc: SPA R2→B2 Path Migration
+
+## Task
+Fix SPA TypeScript source: replace `/r2/` data path prefix with `/b2/` for B2 migration.
+
+## Status: Already Complete
+
+This work was already completed in commits:
+- `76369b5`: "fix(spa): replace /r2/ data path prefix with /b2/"
+- `724f516`: "fix(spa): replace r2.aicodebattle.com with b2.aicodebattle.com"
+
+## Acceptance Criteria Verified
+
+1. ✓ `grep -r "/r2/" src/` returns no hits (exit code 1 = no matches)
+2. ✓ `npm run build` succeeds (completed in 3.38s)
+3. ✓ `grep -r "r2.aicodebattle" dist/` returns no hits (exit code 1 = no matches)
+
+## Current State
+- All `/r2/` paths have been replaced with `/b2/`
+- All `r2.aicodebattle.com` references replaced with `b2.aicodebattle.com`
+- Build artifacts in `dist/` are clean (no R2 references)