feat(ustx,seqtool,base): replace flat-dict USTX API with typed datamo…

[NewComer00]

…del and multi-tempo support

BREAKING CHANGE: load_ustx() now returns UProject instead of dict; save_ustx() now accepts UProject instead of dict;
edit_ustx_expression_curve() is removed — use UstxEditor or UVoicePart.set_curve() instead.

feat(ustx): add UProject, UVoicePart, UCurve, UTrack, UTempo, UTimeSignature dataclasses mirroring OpenUtau C# models

feat(ustx): add TimeAxis — piecewise tick ↔ ms converter replicating OpenUtau's BuildSegments / TickPosToMsPos / MsPosToTickPos logic, with full multi-tempo and multi-time-signature support

feat(ustx): add UstxEditor — RAII context manager with exclusive FileLock, add_expression_to_part(), and add_expression_to_track() (absolute → relative tick translation with per-part windowing)

feat(seqtool): replace time_to_ticks/ticks_to_time with a set_tick_converters() / reset_tick_converters() registry; all to_ticks=True paths and align_sequence_tick() now use the registered tempo-map-aware converters instead of a fixed BPM approximation

feat(base): register tick converters from ustx_time_axis in ExpressionLoader.init(); remove threading.Lock (superseded by FileLock in UstxEditor); remove self.tempo in favour of self.ustx_time_axis; offset shifting moved to load_to_ustx() via shift_ticks_by_seconds()

feat(dyn,pitd,tenc): drop tempo/ppqn kwargs from align_sequence_tick calls; remove manual utau_offset_ticks arithmetic; pitd gains RMS + RMS dynamics features to match dyn/tenc feature sets

feat(examples): add テトリス and Прекрасное Далеко examples with project.ustx, reference.wav, utau.wav, expressive_config.json and README; update 明天会更好 project with reference track and corrected exp_selectors; remove expressive_config.json from .gitignore

fix(wavtool): extract_wav_frequency now returns np.ndarray instead of list, matching documented return type

deps: add filelock to pyproject.toml

test(ustx): replace dict-based assertions with UProject attribute access throughout; add TestUProject, TestUCurve, TestTimeAxis, TestUstxEditor covering roundtrip, multi-tempo boundary, relative-tick translation, and context-manager save/no-save behaviour

test(seqtool): replace TestTimeConversion with TestTickConverterRegistry using _make_tick_converters() helper and tick_converters_120bpm fixture; drop TestNumericalStability (absorbed into registry tests)

test(base): replace loader.tempo with ustx_time_axis assertions; remove ustx_lock tests; add test_tick_converters_registered_after_init

test(wavtool): fix list → ndarray type assertions for extract_wav_frequency return values

test(expressive): fix integration test to use UProject attribute access

[codecov]

Codecov Report

❌ Patch coverage is 90.58172% with 34 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
expressions/pitd.py	11.11%	16 Missing ⚠️
utils/ustx.py	95.86%	12 Missing ⚠️
expressions/tenc.py	0.00%	5 Missing ⚠️
utils/seqtool.py	96.29%	1 Missing ⚠️

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