Implement pose-derived rep metrics

feat(rep_counter): implement exercise-specific rep counters for push-ups, shoulder presses, and squats; add dependency on fastapi

chore: update pydantic and pydantic-core versions, adjust Python version in README, and enhance CI workflow with caching

chore: update short description in README and upgrade checkout action version in CI workflow

fix(lefthook): add --quiet flag to requirements export for cleaner output

fix(lefthook): remove unnecessary git diff check from requirements export

ci: configure Hugging Face Space sync

feat(pose): add pluggable pose backends

refactor(ui): align annotated video size with source video

fix(rep): ignore noisy extrema in squat cycle segmentation

fix(catalog): default auto exercise to squat

refactor(ui): clarify mocked downstream analysis

fix(renderer): prefer web-friendly video codecs

feat(pose): use dense frames for real pose extraction

fix(classifier): default auto routing to squat

docs(readme): document real mode and annotated output

feat(renderer): generate annotated pose videos

fix(rep): clamp mock analysis scores for long sets

feat(pipeline): persist rep debug artifacts

feat(rep): implement deterministic exercise rep segmentation

feat(rep): add shared signal and state machine utilities

refactor(exercises): centralize exercise definitions

Merge pull request #13 from tihado/issue-3-pose-backends

chore: add lefthook checks

test(pose): allow src path imports in pose tests

feat(pose): add pluggable pose backends

update implementation plan

Merge pull request #12 from tihado/issue-2-video-qc

Update setup-uv action to version 8.2.0

ci: add GitHub Actions workflow

feat(video): add intake quality gate

Merge pull request #11 from tihado/issue-1-harden-pipeline-foundation

feat(pipeline): harden mock artifact contracts

first commit