* refactor(cli): unify interactive spawn helper
Consolidate interactive child-process spawning into runInteractiveCommand by adding an optional options bag (cwd/env and error context). This removes duplicate spawn logic and ensures consistent TTY-forwarding and error formatting for installer and clone flows.
Made-with: Cursor
* test(cli): mock interactive spawn in start URL clone tests
Update start URL clone tests to mock node:child_process spawn (stdio: inherit) instead of exec(), matching the interactive clone behavior and preventing hangs/timeouts.
Made-with: Cursor
* test(cli): standardize spawn mocks for start URL clone
Use an EventEmitter-based ChildProcess helper for spawn() in start command tests, matching existing repo patterns and reducing repetitive per-test mock return objects.
Made-with: Cursor
* test(cli): remove unknown cast from SessionManager mock
Add missing SessionManager methods to the start command test mock so we can type it as SessionManager directly without an unknown double-cast.
Made-with: Cursor
* test(cli): type spawn mock args in start tests
Replace unknown-typed spawn mock parameters with concrete cmd/args/options types to improve readability while keeping behavior unchanged.
Made-with: Cursor
* fix(test): remove duplicate mockSessionManager.restore key
Drop the duplicate restore mock introduced during main-branch merge conflict resolution.
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