Add native Windows support (#91)

- Native Windows daemon using TCP loopback endpoints
- Direct-mode fallback for CLI/daemon compatibility
- Comment operations over RPC
- PowerShell installer script
- Go 1.24 requirement
- Cross-OS testing documented

Co-authored-by: danshapiro <danshapiro@users.noreply.github.com>
Amp-Thread-ID: https://ampcode.com/threads/T-c6230265-055f-4af1-9712-4481061886db
Co-authored-by: Amp <amp@ampcode.com>

cmd/bd/direct_mode.go

@@ -0,0 +1,84 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/steveyegge/beads"
+	"github.com/steveyegge/beads/internal/storage/sqlite"
+)
+
+// ensureDirectMode makes sure the CLI is operating in direct-storage mode.
+// If the daemon is active, it is cleanly disconnected and the shared store is opened.
+func ensureDirectMode(reason string) error {
+	if daemonClient != nil {
+		if err := fallbackToDirectMode(reason); err != nil {
+			return err
+		}
+		return nil
+	}
+	return ensureStoreActive()
+}
+
+// fallbackToDirectMode disables the daemon client and ensures a local store is ready.
+func fallbackToDirectMode(reason string) error {
+	disableDaemonForFallback(reason)
+	return ensureStoreActive()
+}
+
+// disableDaemonForFallback closes the daemon client and updates status metadata.
+func disableDaemonForFallback(reason string) {
+	if daemonClient != nil {
+		_ = daemonClient.Close()
+		daemonClient = nil
+	}
+
+	daemonStatus.Mode = "direct"
+	daemonStatus.Connected = false
+	daemonStatus.Degraded = true
+	if reason != "" {
+		daemonStatus.Detail = reason
+	}
+	if daemonStatus.FallbackReason == FallbackNone {
+		daemonStatus.FallbackReason = FallbackDaemonUnsupported
+	}
+
+	if reason != "" && os.Getenv("BD_DEBUG") != "" {
+		fmt.Fprintf(os.Stderr, "Debug: %s\n", reason)
+	}
+}
+
+// ensureStoreActive guarantees that a local SQLite store is initialized and tracked.
+func ensureStoreActive() error {
+	storeMutex.Lock()
+	active := storeActive && store != nil
+	storeMutex.Unlock()
+	if active {
+		return nil
+	}
+
+	if dbPath == "" {
+		if found := beads.FindDatabasePath(); found != "" {
+			dbPath = found
+		} else {
+			return fmt.Errorf("no beads database found. Hint: run 'bd init' in this directory")
+		}
+	}
+
+	sqlStore, err := sqlite.New(dbPath)
+	if err != nil {
+		return fmt.Errorf("failed to open database: %w", err)
+	}
+
+	storeMutex.Lock()
+	store = sqlStore
+	storeActive = true
+	storeMutex.Unlock()
+
+	checkVersionMismatch()
+	if autoImportEnabled {
+		autoImportIfNewer()
+	}
+
+	return nil
+}