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

go.mod

@@ -0,0 +1,25 @@
+module github.com/steveyackey/beads
+
+go 1.25.2
+
+require (
+	github.com/fatih/color v1.18.0 // indirect
+	github.com/fsnotify/fsnotify v1.9.0 // indirect
+	github.com/go-viper/mapstructure/v2 v2.4.0 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/mattn/go-sqlite3 v1.14.32 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.4 // indirect
+	github.com/sagikazarmark/locafero v0.11.0 // indirect
+	github.com/sourcegraph/conc v0.3.1-0.20240121214520-5f936abd7ae8 // indirect
+	github.com/spf13/afero v1.15.0 // indirect
+	github.com/spf13/cast v1.10.0 // indirect
+	github.com/spf13/cobra v1.10.1 // indirect
+	github.com/spf13/pflag v1.0.10 // indirect
+	github.com/spf13/viper v1.21.0 // indirect
+	github.com/subosito/gotenv v1.6.0 // indirect
+	go.yaml.in/yaml/v3 v3.0.4 // indirect
+	golang.org/x/sys v0.29.0 // indirect
+	golang.org/x/text v0.28.0 // indirect
+)