refactor(ai-launcher): extract pure decision cores from the git/tmux paths

I moved the decision logic out of the launcher's I/O-coupled functions so it's unit-testable on plain inputs, the hardening the audit called for. Three pure cores now carry logic that was buried in git and tmux calls: _git_prep_action classifies a repo's state into none/pull/report, _order_windows sorts the window listing, and _match_window_id resolves a name to a window id. _git_is_dirty replaces the staged/unstaged/untracked check that was copy-pasted across three functions.

prep_git_single and auto_pull_if_clean both route their pull-or-report choice through _git_prep_action, so the "never auto-pull a dirty repo" rule lives in one place with its own test instead of two parallel branches. sort_windows keeps its two-pass move (park high, then reassign) but hands the ordering to _order_windows, and find_window_id is now a thin tmux wrapper over _match_window_id.

Each core gets a Normal/Boundary/Error set: the git-prep truth table including diverged and behind-while-dirty, the window ordering including whole-line-not-substring matching. The 42 launcher tests stay green and a live black-box run still prints the right launch command for claude and codex, so the extraction is behavior-neutral. I also ran shfmt (-i 2 -ci) to match the house style the other bin/ scripts follow.

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