[ty] Test tagged union narrowing for named tuples#25519
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* main: [`pydocstyle`] Improve discoverability of rules enabled for each convention (#24973) [ty] Deduplicate retained use-def place states (#25450) [ty] reduce features of low-level crates depended on by `ty_python_semantic` (#25524) [ty] Fix narrowing enum literal unions by member identity (#25520) [ty] Test tagged union narrowing for named tuples (#25519) [ty] Disallow file-system access in `ty_python_core` (#25518) [ty] Nominal Tagged Union Narrowing (#24916) Commit `scripts/uv.lock` (#25517) Fix potential index out of range in `LineIndex` computation (#25492) [ty] Sync vendored typeshed stubs (#25514) [ty] Add disjointness for protocol method members (#25315) [ty] Use compact sets for more immutable fields (#25476) [ty] Derive `Default` for `FunctionDecoratorInference` (#25482) [ty] Ignore rejected assignments for synthesized bindings (#25340) [ty] Handle cycles in function decorator inference (#25475) docs: fix typo `bin/active` → `bin/activate` in tutorial (#25473) [ty] Narrow bound method overloads by receiver (#24707)
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Summary
Add an mdtest showing that tagged-union narrowing also works for
NamedTupleclasses.