When adding a session, using this special syntax will create a new session for the indicated agent.
E.g., `book!my-session` opens a new session for the %book agent.
When creating a new session, validate that it meets the following conditions:
- must start with an alphabetical
- can be composed of alphanumerics with hyphens
- can be length 1 or longer
- cannot begin or end with a hyphen
Fully implements webterm support for multiple dill terminal sessions.
Remaining work includes styling, session creation safety (name-wise),
and general cleanup.
Co-authored-by: tomholford <tomholford@users.noreply.github.com>
Co-authored-by: liam-fitzgerald <liam@tlon.io>
