Unskip & fix skipped tests (Windows I/O, TIFF reshape axes, missing core symbols, 3D shape ambiguity, Torch parity drift, flow mock)

[phflot]

Problem

Multiple tests are currently skipped because they fail deterministically (platform/axis handling/API/parity).

Root causes + fixes

• Windows temp-file locking: tests pass an open NamedTemporaryFile path to TIFFFileWriter3D → PermissionError on remove/overwrite. Fix: use TemporaryDirectory + explicit paths; close all handles before writing.
• TIFF reshape series axes (TCYX/TZCYX/ZCYX/… ): ReshapeTIFFReader._read_series_mode doesn’t normalize/squeeze/reorder TZ/C/Z dims, producing non-(H,W,C) frames. Fix: enforce per-frame (H,W,C); if Z==1 squeeze; if Z>1 either flatten (T,Z)→time (documented) or raise clear error directing users to TIFFFileReader3D.
• Core/API gaps + 3D shape ambiguity
  • compensate_inplace expects missing compensate_sequence_uv.
  • compensate_arr_3D turns (Z,Y,X,C) into (1,Z,Y,X,C).
• CPU and Torch parity drift (normalize/gaussian/resize): differences are algorithmic + dtype policy (Torch forced fp32).
  • Approximate Torch: relax parity tests to property/tolerance checks and document non-bitwise parity.
• Flow extraction test: code path changed.

Affected tests

tests/cli/test_tiff_reshape.py (reshape suite), CLI integration test_cli_with_all_options, TestConvenienceFunction3D::test_compensate_inplace_3d, test_shape_ambiguity_handling, parity suites for normalize/gaussian/resize, TestFlowComputation3D::test_3d_flow_parameters_extraction.