align_footage's window-refusal rationale cites a mixing behaviour that no longer exists #98

Discovered while implementing reeleehq/mixing#43 (mixing PR reeleehq/mixing#51). No muvid code change is needed — this is about prose that will mislead the next reader.

What is stale

muvid/footage/align.py refuses to forward window_s/hop_s (WINDOW_PARAMETERS), and both the comment on that constant and tests/test_alignment_trust.py::test_a_wider_window_is_refused_because_it_would_turn_the_gate_off justify the refusal partly on this measurement:

the defaults give support=0.75 and a vouched alignment; window_s=45 on the same clip gives support=None, which drops the verdict onto the confidence coefficient — i.e. the support gate switches OFF and the caller is told nothing.

As of mixing 0.0.53, mixing.audio.align_clips_to_reference raises mixing.errors.WindowTooWideForClip for exactly that call rather than returning support=None. The silent-gate-off failure mode described there is no longer reachable through mixing.

Why the refusal still stands

The other leg is untouched and is the stronger one: narrowing the window deflates every support (measured 0.38–0.70 at a 20 s window vs 0.00–1.00 at a 4 s one), so correct alignments fall under MIN_SUPPORT. mixing refuses only windows a clip cannot hold — it says nothing about a window that re-scales the gate downward, which is muvid's concern. align_footage should keep refusing both parameters.

The work

• Update the WINDOW_PARAMETERS comment: keep the widening measurement as history (it is what motivated the refusal) but say that mixing >= 0.0.53 refuses it outright, and rest the live argument on the narrowing side.
• Rename/restate test_a_wider_window_is_refused_because_it_would_turn_the_gate_off so its name does not assert a mechanism that has moved. The assertion itself (pytest.raises(TypeError, match="MIN_SUPPORT")) is still correct and should stay — muvid must refuse before mixing gets the chance to.
• Consider whether the mixing floor in pyproject.toml should move to 0.0.53. Not required (nothing muvid calls changed shape), so it is a judgement call about what the comment there is allowed to claim.