v0.1.1 — render cache + 41 pytest unit tests + CI matrix

Quality + resilience pass. No new user-facing features; faster re-runs and confidence in correctness.

Added

• Output-level render cache in bin/render.sh. Keyed on sha256(canonical_edl_json).
  Re-runs with the same EDL skip the encode entirely and copy from cache (<1s vs 25-40 min).
• 41 pytest unit tests across lib/treatments, lib/selector, lib/moves, and
  bin/sync-cameras.robust_offset. Catches regressions in pure logic without needing
  real video fixtures.
• GitHub Actions CI: matrix on ubuntu-latest + macos-latest × Python 3.11/3.12.
  Runs pytest, bash/python syntax checks, and dj-edit quickstart --demo smoke test.
• scripts/release.sh one-command release helper. Bumps version, tags, creates
  GitHub release, computes tarball SHA256, updates the brew formula in the tap.

Fixed

• robust_offset in bin/sync-cameras.py now takes optional cam_dur to filter out
  clipping-at-master-end artifacts more aggressively. Caught by test_sync_helpers.py.
• Attempted a per-chunk render cache approach for mid-render resume, but reverted due to
  3-5x slowdown vs monolithic (per-chunk decode setup on a 64GB source doesn't share work).
  Output-level cache is the cleaner solution for the common iteration case.

Notes

• v0.2 will add: per-camera LUTs (color match), Songrec track-ID burn-in, --style
  knob that actually changes pacing, watermark + endcard. See lexical-percolating-bee.md
  in the plan archive for full backlog.