Updated firmware to 1.93, can't connect.

Done! : )

I removed everything from npm, reverted everything back to defaults, unpaired/removed the puck with bluetoothctl, cleared the cache, restarted, removed all code from the IDE and saved the blank file, then I tried to pair straight from the IDE -- no pairing with bluetoothctl first, though I did have it open in the terminal.

This is what the 'good' output looked like:

[CHG] Controller 00:16:EB:79:49:23 Discovering: yes
[NEW] Device F7:86:42:E9:36:7C Puck.js 367c
[CHG] Device F7:86:42:E9:36:7C RSSI: -55
[CHG] Device F7:86:42:E9:36:7C RSSI is nil
[CHG] Controller 00:16:EB:79:49:23 Discovering: no
[CHG] Device F7:86:42:E9:36:7C Connected: yes
[CHG] Device F7:86:42:E9:36:7C Trusted: yes
[NEW] Primary Service
	/org/bluez/hci0/dev_F7_86_42_E9_36_7C/se­rvice000a
	00001801-0000-1000-8000-00805f9b34fb
	Generic Attribute Profile
[NEW] Primary Service
	/org/bluez/hci0/dev_F7_86_42_E9_36_7C/se­rvice000b
	6e400001-b5a3-f393-e0a9-e50e24dcca9e
	Nordic UART Service
[NEW] Characteristic
	/org/bluez/hci0/dev_F7_86_42_E9_36_7C/se­rvice000b/char000c
	6e400003-b5a3-f393-e0a9-e50e24dcca9e
	Nordic UART RX
[NEW] Descriptor
	/org/bluez/hci0/dev_F7_86_42_E9_36_7C/se­rvice000b/char000c/desc000e
	00002902-0000-1000-8000-00805f9b34fb
	Client Characteristic Configuration
[NEW] Characteristic
	/org/bluez/hci0/dev_F7_86_42_E9_36_7C/se­rvice000b/char000f
	6e400002-b5a3-f393-e0a9-e50e24dcca9e
	Nordic UART TX
[CHG] Device F7:86:42:E9:36:7C UUIDs: 00001800-0000-1000-8000-00805f9b34fb
[CHG] Device F7:86:42:E9:36:7C UUIDs: 00001801-0000-1000-8000-00805f9b34fb
[CHG] Device F7:86:42:E9:36:7C UUIDs: 6e400001-b5a3-f393-e0a9-e50e24dcca9e
[CHG] Device F7:86:42:E9:36:7C ServicesResolved: yes

Gordon, thanks again for your patience and persistence. I'm still not sure what went wrong or what fixed it. : \ I hope that things stay fixed!