feat(cli): try confirm-or-revert prefs

[benallfree]

Hey guys this is a draft PR for visibility only, curious to hear what everyone thinks.

I've been experimenting with some meshcore settings having to do with radio RX and got to wondering how I would get the node back if the RX setting caused it to go deaf.

My generalized solution/proposal is a try command that will flip a setting back after a timeout unless it is committed with set. And to avoid footguns, you can also use try reboot which will reboot the device after reverting the setting. Some settings auto-arm reboot to further avoid footguns.

Sample commands:

# Start a 1-hour rxgain trial (reverts unless you commit)
try 3600 radio.rxgain off

# Same, but reboot after timeout revert (optional keyword)
try reboot 3600 radio.rxgain off

# Radio 4-tuple trial (reboot armed on revert is inherited; apply still needs manual reboot)
try 3600 radio 915.0,250,11,5

# Powersaving is a bare verb, not set powersaving
try 1800 powersaving on

# List pending trials (key, trial value, seconds left, reboot suffix if armed)
get try

# Commit before timeout (cancels revert for that key)
set radio.rxgain off

# Snapshot current value (what try would revert to)
get radio.rxgain

# Short bench run
try 10 radio.rxgain off
get try
# wait ~10s, then:
get radio.rxgain
get try

[LitBomb]

@benallfree are you the guy behind envybot?

https://www.reddit.com/r/meshcore/comments/1w5whrh/a_local_5013c_organization_is_vibe_coding_a/

https://github.com/MeshEnvy/envybot