notes(bf-dgn): verify setup-r2.sh replaced with setup-b2.sh

notes/bf-dgn.md

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+# Bead bf-dgn: Replace setup-r2.sh with setup-b2.sh
+
+## Verification Summary
+
+Task already completed in commit 65ea26f.
+
+## Acceptance Criteria Verified ✅
+
+1. ✅ **scripts/setup-r2.sh does not exist** - Confirmed via `ls` command
+2. ✅ **scripts/setup-b2.sh exists, is executable, and runs without error** - Verified at 5590 bytes with `-rwxr-xr-x` permissions
+3. ✅ **grep -r "setup-r2" scripts/ returns no hits** - Confirmed no references remain
+
+## setup-b2.sh Features
+
+The script successfully:
+- Prints B2 bucket endpoint (reads from B2_ENDPOINT env var)
+- Prints exact CNAME target for b2.aicodebattle.com → acb-data.s3.us-west-002.backblazeb2.com
+- Verifies B2 credentials via curl to B2 API (when B2_KEY_ID/B2_APPLICATION_KEY are set)
+- Is informational/verification-only (no destructive operations)
+- Gracefully handles missing credentials with helpful setup instructions
+
+## cloudflare-setup.sh Status
+
+Already updated to reference B2 setup separately (lines 52-59) with no calls to setup-r2.sh.
+
+## Test Results
+
+Script executes successfully with and without B2 credentials:
+- Without credentials: Shows helpful setup instructions
+- With credentials: Performs API authentication verification
+
+**Date:** 2025-06-17
+**Verified by:** Claude Code