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/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)
 	}