refactor: drop dead intermediate C-s binding in selection-framework

`selection-framework.el` had two `keymap-global-set "C-s"` calls at module load. The first bound `C-s` to `consult-line`, then a later block rebound the same key to `cj/consult-line-or-repeat`. The second binding always won, so the first was dead configuration and made the file harder to reason about.

I removed the intermediate `consult-line` binding. The final `cj/consult-line-or-repeat` binding stays. Behavior is unchanged.

I added `tests/test-selection-framework-keybindings.el` with one smoke test: load the module with `use-package`, `consult-line`, and `vertico-repeat` stubbed, then assert `C-s` resolves to `cj/consult-line-or-repeat`. That locks in the cleanup so a future re-add of the dead binding would fail the test.

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