chore: bump version to 0.27.0

Release highlights:
- Custom status states via config (bd-1pj6)
- Contributor fork workflows: bd init --contributor (bd-bx9)
- Full git worktree support (#416)
- CRITICAL: Sync corruption prevention (hash-based staleness + reverse ZFC)
- Out-of-order dependency handling in JSONL import (#414)
- bd sync --squash for batching commits (bd-o2e)
- Fresh clone detection in bd doctor (bd-4ew)

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

cmd/bd/version.go

@@ -14,7 +14,7 @@ import (
 
 var (
 	// Version is the current version of bd (overridden by ldflags at build time)
-	Version = "0.26.2"
+	Version = "0.27.0"
 	// Build can be set via ldflags at compile time
 	Build = "dev"
 	// Commit and branch the git revision the binary was built from (optional ldflag)