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

QUICKSTART.md

@@ -0,0 +1,104 @@
+# Beads Quickstart
+
+Get up and running with Beads in 2 minutes.
+
+## Installation
+
+```bash
+cd ~/src/beads
+go build -o beads ./cmd/beads
+./beads --help
+```
+
+## Your First Issues
+
+```bash
+# Create a few issues
+./beads create "Set up database" -p 1 -t task
+./beads create "Create API" -p 2 -t feature
+./beads create "Add authentication" -p 2 -t feature
+
+# List them
+./beads list
+```
+
+## Add Dependencies
+
+```bash
+# API depends on database
+./beads dep add bd-2 bd-1
+
+# Auth depends on API
+./beads dep add bd-3 bd-2
+
+# View the tree
+./beads dep tree bd-3
+```
+
+Output:
+```
+🌲 Dependency tree for bd-3:
+
+→ bd-3: Add authentication [P2] (open)
+  → bd-2: Create API [P2] (open)
+    → bd-1: Set up database [P1] (open)
+```
+
+## Find Ready Work
+
+```bash
+./beads ready
+```
+
+Output:
+```
+📋 Ready work (1 issues with no blockers):
+
+1. [P1] bd-1: Set up database
+```
+
+Only bd-1 is ready because bd-2 and bd-3 are blocked!
+
+## Work the Queue
+
+```bash
+# Start working on bd-1
+./beads update bd-1 --status in_progress
+
+# Complete it
+./beads close bd-1 --reason "Database setup complete"
+
+# Check ready work again
+./beads ready
+```
+
+Now bd-2 is ready! 🎉
+
+## Track Progress
+
+```bash
+# See blocked issues
+./beads blocked
+
+# View statistics
+./beads stats
+```
+
+## Database Location
+
+By default: `~/.beads/beads.db`
+
+You can use project-specific databases:
+
+```bash
+./beads --db ./my-project.db create "Task"
+```
+
+## Next Steps
+
+- Add labels: `./beads create "Task" -l "backend,urgent"`
+- Filter ready work: `./beads ready --priority 1`
+- Search issues: `./beads list --status open`
+- Detect cycles: `./beads dep cycles`
+
+See [README.md](README.md) for full documentation.