Parent: #230
Part of the JTK command surface area rethink tracked in #230.
Acceptance criteria:\n- jtk init performs instance discovery and seeds the cache\n- The custom-field picker persists the default issue field shortlist\n- Non-interactive defaults are supported for headless use\n- init output and saved preferences align with the specification
Parent: #230
Part of the JTK command surface area rethink tracked in #230.
Acceptance criteria:\n- jtk init performs instance discovery and seeds the cache\n- The custom-field picker persists the default issue field shortlist\n- Non-interactive defaults are supported for headless use\n- init output and saved preferences align with the specification