feat(deletions): complete deletions manifest epic with integration tests

Completes the deletion propagation epic (bd-imj) with all 9 subtasks:
- Cross-clone deletion propagation via deletions.jsonl
- bd deleted command for audit trail
- Auto-compact during sync (opt-in)
- Git history fallback with timeout and regex escaping
- JSON output for pruning results
- Integration tests for deletion scenarios
- Documentation in AGENTS.md, README.md, and docs/DELETIONS.md

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

cmd/bd/sync.go

@@ -13,6 +13,7 @@ import (
 	"time"
 
 	"github.com/spf13/cobra"
+	"github.com/steveyegge/beads/internal/configfile"
 	"github.com/steveyegge/beads/internal/deletions"
 	"github.com/steveyegge/beads/internal/rpc"
 	"github.com/steveyegge/beads/internal/syncbranch"
@@ -1171,7 +1172,7 @@ func maybeAutoCompactDeletions(ctx context.Context, jsonlPath string) error {
 	}
 
 	// Get retention days (default 7)
-	retentionDays := deletions.DefaultRetentionDays
+	retentionDays := configfile.DefaultDeletionsRetentionDays
 	if retentionStr, err := store.GetConfig(ctx, "deletions.retention_days"); err == nil && retentionStr != "" {
 		if parsed, err := strconv.Atoi(retentionStr); err == nil && parsed > 0 {
 			retentionDays = parsed