Initial commit: Beads issue tracker with security fixes

Core features:
- Dependency-aware issue tracking with SQLite backend
- Ready work detection (issues with no open blockers)
- Dependency tree visualization
- Cycle detection and prevention
- Full audit trail
- CLI with colored output

Security and correctness fixes applied:
- Fixed SQL injection vulnerability in UpdateIssue (whitelisted fields)
- Fixed race condition in ID generation (added mutex)
- Fixed cycle detection to return full paths (not just issue IDs)
- Added cycle prevention in AddDependency (validates before commit)
- Added comprehensive input validation (priority, status, types, etc.)
- Fixed N+1 query in GetBlockedIssues (using GROUP_CONCAT)
- Improved query building in GetReadyWork (proper string joining)
- Fixed P0 priority filter bug (using Changed() instead of value check)

All critical and major issues from code review have been addressed.

🤖 Generated with Claude Code

.gitignore

@@ -0,0 +1,23 @@
+# Binaries
+beads
+*.exe
+*.dll
+*.so
+*.dylib
+
+# Test binaries
+*.test
+*.out
+
+# Go workspace file
+go.work
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# Database (if you want to exclude)
+# *.db