test(ai-launcher): net current behavior and make bin/ai source-testable

Brings the session launcher under characterization tests ahead of the hardening refactor, so the pure-core extractions and footgun fixes land against a green net. The tmux/git-coupled functions can't be reached by running the launcher black-box, so I wrapped dispatch in main() behind a run-vs-sourced guard: run directly it dispatches as before, sourced it exposes the functions to the tests.

The net pins current behavior (record-not-spec) with a Normal/Boundary/Error set per unit: git_status_indicator across no-upstream/ahead/behind/dirty/clean, candidate discovery and filtering, selection parsing, and functional tests over create_window, find_window_id, and sort_windows ordering against a throwaway tmux server. Every tmux call runs on a private socket so nothing touches the live ai session, and the throwaway repos disable git auto-maintenance to dodge the teardown race that flaked rename-ai.

Also cleared the two pre-existing shellcheck warnings on the touched paths: quoted the "@{u}" revspecs (SC1083) and marked the intentionally-literal display tilde (SC2088). Both are behavior-neutral, and the existing runtime tests confirm the launch path is unchanged.

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