refactor(storage): move LocalProvider to internal/storage package

Move LocalProvider from cmd/bd/doctor/git.go to internal/storage/local_provider.go
where it belongs alongside StorageProvider. Both implement IssueProvider for
orphan detection - LocalProvider for direct SQLite access (--db flag),
StorageProvider for the global Storage interface.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/storage/local_provider.go

@@ -0,0 +1,106 @@
+// Package storage defines the interface for issue storage backends.
+package storage
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/steveyegge/beads/internal/types"
+)
+
+// LocalProvider implements types.IssueProvider using a read-only SQLite connection.
+// This is used for cross-repo orphan detection when --db flag points to an external database.
+type LocalProvider struct {
+	db     *sql.DB
+	prefix string
+}
+
+// NewLocalProvider creates a provider backed by a SQLite database at the given path.
+func NewLocalProvider(dbPath string) (*LocalProvider, error) {
+	db, err := openDBReadOnly(dbPath)
+	if err != nil {
+		return nil, err
+	}
+
+	// Get issue prefix from config
+	var prefix string
+	err = db.QueryRow("SELECT value FROM config WHERE key = 'issue_prefix'").Scan(&prefix)
+	if err != nil || prefix == "" {
+		prefix = "bd" // default
+	}
+
+	return &LocalProvider{db: db, prefix: prefix}, nil
+}
+
+// GetOpenIssues returns issues that are open or in_progress.
+func (p *LocalProvider) GetOpenIssues(ctx context.Context) ([]*types.Issue, error) {
+	// Get all open/in_progress issues with their titles (title is optional for compatibility)
+	rows, err := p.db.QueryContext(ctx, "SELECT id, title, status FROM issues WHERE status IN ('open', 'in_progress')")
+	// If the query fails (e.g., no title column), fall back to simpler query
+	if err != nil {
+		rows, err = p.db.QueryContext(ctx, "SELECT id, '', status FROM issues WHERE status IN ('open', 'in_progress')")
+		if err != nil {
+			return nil, err
+		}
+	}
+	defer rows.Close()
+
+	var issues []*types.Issue
+	for rows.Next() {
+		var id, title, status string
+		if err := rows.Scan(&id, &title, &status); err == nil {
+			issues = append(issues, &types.Issue{
+				ID:     id,
+				Title:  title,
+				Status: types.Status(status),
+			})
+		}
+	}
+
+	return issues, nil
+}
+
+// GetIssuePrefix returns the configured issue prefix.
+func (p *LocalProvider) GetIssuePrefix() string {
+	return p.prefix
+}
+
+// Close closes the underlying database connection.
+func (p *LocalProvider) Close() error {
+	if p.db != nil {
+		return p.db.Close()
+	}
+	return nil
+}
+
+// Ensure LocalProvider implements types.IssueProvider
+var _ types.IssueProvider = (*LocalProvider)(nil)
+
+// openDBReadOnly opens a SQLite database in read-only mode.
+func openDBReadOnly(dbPath string) (*sql.DB, error) {
+	connStr := sqliteReadOnlyConnString(dbPath)
+	return sql.Open("sqlite3", connStr)
+}
+
+// sqliteReadOnlyConnString builds a read-only SQLite connection string.
+func sqliteReadOnlyConnString(path string) string {
+	path = strings.TrimSpace(path)
+	if path == "" {
+		return ""
+	}
+
+	// Honor BD_LOCK_TIMEOUT env var for busy timeout
+	busy := 30 * time.Second
+	if v := strings.TrimSpace(os.Getenv("BD_LOCK_TIMEOUT")); v != "" {
+		if d, err := time.ParseDuration(v); err == nil {
+			busy = d
+		}
+	}
+	busyMs := int64(busy / time.Millisecond)
+
+	return fmt.Sprintf("file:%s?mode=ro&_pragma=foreign_keys(ON)&_pragma=busy_timeout(%d)", path, busyMs)
+}