chore: fix UBS hook stdin parsing and update beads

.claude/hooks/on-file-write.sh:
- Fix hook to read Claude Code context from JSON stdin (FILE_PATH and
  CWD extracted via jq) instead of relying on environment variables
- Scan only the changed file instead of the entire project directory,
  reducing hook execution from ~30s to <1s per save

.beads/:
- Sync issue tracker state

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.claude/hooks/on-file-write.sh

@@ -1,6 +1,11 @@
 #!/bin/bash
 # Ultimate Bug Scanner - Claude Code Hook
 # Runs on every file save for UBS-supported languages (JS/TS, Python, C/C++, Rust, Go, Java, Ruby)
+# Claude Code hooks receive context as JSON on stdin.
+
+INPUT=$(cat)
+FILE_PATH=$(echo "$INPUT" | jq -r '.tool_input.file_path // empty')
+CWD=$(echo "$INPUT" | jq -r '.cwd // empty')
 
 if [[ "$FILE_PATH" =~ \.(js|jsx|ts|tsx|mjs|cjs|py|pyw|pyi|c|cc|cpp|cxx|h|hh|hpp|hxx|rs|go|java|rb)$ ]]; then
   echo "🔬 Running bug scanner..."
@@ -8,5 +13,5 @@ if [[ "$FILE_PATH" =~ \.(js|jsx|ts|tsx|mjs|cjs|py|pyw|pyi|c|cc|cpp|cxx|h|hh|hpp|
     echo "⚠️  'ubs' not found in PATH; install it before using this hook." >&2
     exit 0
   fi
-  ubs "${PROJECT_DIR}" --ci 2>&1 | head -50
+  ubs "$FILE_PATH" --ci 2>&1 | head -50
 fi