Add expose config command

[kernelshard]

Description

Add expose config command to view and manage configuration.

Commands

expose config list

Show all config values.

expose config get <key>

Get a specific configuration value.

Example

$ expose config list

project: expose
port: 3000

$ expose config get port

3000

• Read .expose.yml from current directory
• config list → show all values
• config get <key> → return specific value
• Handle missing file gracefully
• Tests ≥ 75% coverage

Notes

MVP only.
set / unset features planned for v0.2.0

[kernelshard]

#17