tfcollins / pytest-libiio / 26347477238

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Add ty type checker and fix mypy/ty diagnostics

- Add `nox -s ty` session running Astral's ty; add types-PyYAML and
  types-paramiko to the mypy session so it has stubs for those imports.
- plugin.py: replace implicit-Optional parameter defaults in
  iio_emu_manager with proper Optional[...] types; annotate
  self.p / self.hw / self.data_devices; stop assigning Optional[str]
  from os.getenv("IIO_EMU_URI") to self.uri; narrow exception in
  find_contexts from Exception to OSError to make ex.errno well-typed.
- plugin.py: move pytest._context_table / pytest.hw_telemetry /
  pytest.hw_telemetry_ssh_sessions module-stash anti-pattern to proper
  module-level globals (_context_table, _hw_telemetry,
  _hw_telemetry_ssh_sessions).
- mkpatch.py: rename _check_tracker -> _get_tracker (returns tracker so
  ty can narrow); replace _Attr._read_org/_write_org attribute stash
  with module-level _orig_read/_orig_write; install/restore monkey
  patch via setattr (with noqa B010) to make dynamic patching explicit.
- meta.py: drop unused `# type: ignore` on xml_str decode.
- Tests updated to match the refactors and to raise OSError subclasses
  so find_contexts catches them.

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687 of 797 relevant lines covered (86.2%)

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