List subagent sessions

[dbpolito]

Currently we can only navigate between subagent sessions using <super> left / right, this PR introduces:

• New keybinding, defaulting to none
• /subagent-sessions command

Not sure i'm 100% happy with the naming as you open to see subagent sessions but you can select Main vs Subagent... Maybe we need better name.

Also the code is a bit inconsistent, internal vars calls child vs user facing uses subagent, etc. I tried to keep consistency.

[dbpolito]

Test failed on the comment of the type, which has that inconsistency child session / subagent session, not sure what to do there...

[rekram1-node]

@dbpolito I think it failed because you didn't update the sdk:

./packages/sdk/js/script/build.ts

[dbpolito]

@rekram1-node thx, it ended up doing this change and working now

[Dapicom]

this is great news , which version to install to get this feature?

[dbpolito]

@rekram1-node i've updated the PR to remove the default keybinding to make it easier for merge and avoid conflicting with user's one.