Show the differences in issues between two commits or branches.

This command requires the Dolt storage backend. The refs can be:
- Commit hashes (e.g., abc123def)
- Branch names (e.g., main, feature-branch)
- Special refs like HEAD, HEAD~1

Examples:
  bd diff main feature-branch   # Compare main to feature branch
  bd diff HEAD~5 HEAD           # Show changes in last 5 commits
  bd diff abc123 def456         # Compare two specific commits

Usage:
  bd diff <from-ref> <to-ref> [flags]

Flags:
  -h, --help   help for diff

Global Flags:
      --actor string              Actor name for audit trail (default: $BD_ACTOR, git user.name, $USER)
      --allow-stale               Allow operations on potentially stale data (skip staleness check)
      --db string                 Database path (default: auto-discover .beads/*.db)
      --dolt-auto-commit string   Dolt backend: auto-commit after write commands (off|on). Default from config key dolt.auto-commit
      --json                      Output in JSON format
      --lock-timeout duration     SQLite busy timeout (0 = fail immediately if locked) (default 30s)
      --no-auto-flush             Disable automatic JSONL sync after CRUD operations
      --no-auto-import            Disable automatic JSONL import when newer than DB
      --no-daemon                 Force direct storage mode, bypass daemon if running
      --no-db                     Use no-db mode: load from JSONL, no SQLite
      --profile                   Generate CPU profile for performance analysis
  -q, --quiet                     Suppress non-essential output (errors only)
      --readonly                  Read-only mode: block write operations (for worker sandboxes)
      --sandbox                   Sandbox mode: disables daemon and auto-sync
  -v, --verbose                   Enable verbose/debug output