Ban non-exhaustive Zig switch else prongs - #10623
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# Conflicts: # src/postcheck/monotype/solve.zig
# Conflicts: # ci/zig_lints.zig
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Adds an AST-based Zig lint that rejects else switch prongs unless the switch contains numeric, string, or character literal cases, where a catch-all represents value-domain behavior rather than an omitted enum tag. Existing enum, error, and OS switches now enumerate their cases or use a discard prong where Zig permits it, so future enum additions fail to compile instead of silently taking an existing default.