feat(daemon): add auto_pull config parameter for periodic remote sync

Add --auto-pull flag to control whether the daemon periodically pulls from
remote to check for updates from other clones.

Configuration precedence:
1. --auto-pull CLI flag (highest)
2. BEADS_AUTO_PULL environment variable
3. daemon.auto_pull in database config
4. Default: true when sync.branch is configured

When auto_pull is enabled, the daemon creates a remoteSyncTicker that
periodically calls doAutoImport() to pull remote changes. When disabled,
users must manually run 'git pull' to sync remote changes.

Changes:
- cmd/bd/daemon.go: Add --auto-pull flag and config reading logic
- cmd/bd/daemon_event_loop.go: Gate remoteSyncTicker on autoPull parameter
- cmd/bd/daemon_lifecycle.go: Add auto-pull to status output and spawn args
- internal/rpc/protocol.go: Add AutoPull field to StatusResponse
- internal/rpc/server_core.go: Add autoPull to Server struct and SetConfig
- internal/rpc/server_routing_validation_diagnostics.go: Include in status
- Tests updated to pass autoPull parameter

Closes #TBD

internal/rpc/protocol.go

@@ -300,6 +300,7 @@ type StatusResponse struct {
 	// Daemon configuration
 	AutoCommit   bool   `json:"auto_commit"`            // Whether auto-commit is enabled
 	AutoPush     bool   `json:"auto_push"`              // Whether auto-push is enabled
+	AutoPull     bool   `json:"auto_pull"`              // Whether auto-pull is enabled (periodic remote sync)
 	LocalMode    bool   `json:"local_mode"`             // Whether running in local-only mode (no git)
 	SyncInterval string `json:"sync_interval"`          // Sync interval (e.g., "5s")
 	DaemonMode   string `json:"daemon_mode"`            // Sync mode: "poll" or "events"

internal/rpc/server_core.go

@@ -57,6 +57,7 @@ type Server struct {
 	// Daemon configuration (set via SetConfig after creation)
 	autoCommit   bool
 	autoPush     bool
+	autoPull     bool
 	localMode    bool
 	syncInterval string
 	daemonMode   string
@@ -159,11 +160,12 @@ func (s *Server) MutationChan() <-chan MutationEvent {
 }
 
 // SetConfig sets the daemon configuration for status reporting
-func (s *Server) SetConfig(autoCommit, autoPush, localMode bool, syncInterval, daemonMode string) {
+func (s *Server) SetConfig(autoCommit, autoPush, autoPull, localMode bool, syncInterval, daemonMode string) {
 	s.mu.Lock()
 	defer s.mu.Unlock()
 	s.autoCommit = autoCommit
 	s.autoPush = autoPush
+	s.autoPull = autoPull
 	s.localMode = localMode
 	s.syncInterval = syncInterval
 	s.daemonMode = daemonMode

internal/rpc/server_routing_validation_diagnostics.go

@@ -280,6 +280,7 @@ func (s *Server) handleStatus(_ *Request) Response {
 	s.mu.RLock()
 	autoCommit := s.autoCommit
 	autoPush := s.autoPush
+	autoPull := s.autoPull
 	localMode := s.localMode
 	syncInterval := s.syncInterval
 	daemonMode := s.daemonMode
@@ -297,6 +298,7 @@ func (s *Server) handleStatus(_ *Request) Response {
 		ExclusiveLockHolder: lockHolder,
 		AutoCommit:          autoCommit,
 		AutoPush:            autoPush,
+		AutoPull:            autoPull,
 		LocalMode:           localMode,
 		SyncInterval:        syncInterval,
 		DaemonMode:          daemonMode,

internal/rpc/status_test.go

@@ -97,7 +97,7 @@ func TestStatusEndpointWithConfig(t *testing.T) {
 	server := NewServer(socketPath, store, tmpDir, dbPath)
 
 	// Set config before starting
-	server.SetConfig(true, true, false, "10s", "events")
+	server.SetConfig(true, true, true, false, "10s", "events")
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
@@ -155,7 +155,7 @@ func TestStatusEndpointLocalMode(t *testing.T) {
 	server := NewServer(socketPath, store, tmpDir, dbPath)
 
 	// Set config for local mode
-	server.SetConfig(false, false, true, "5s", "poll")
+	server.SetConfig(false, false, false, true, "5s", "poll")
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
@@ -284,7 +284,7 @@ func TestSetConfigConcurrency(t *testing.T) {
 	done := make(chan bool)
 	for i := 0; i < 10; i++ {
 		go func(n int) {
-			server.SetConfig(n%2 == 0, n%3 == 0, n%4 == 0, "5s", "events")
+			server.SetConfig(n%2 == 0, n%3 == 0, n%5 == 0, n%4 == 0, "5s", "events")
 			done <- true
 		}(i)
 	}