docs(readme): note git-lfs requirement for full clones (heygen-com#423)

* docs(readme): note git-lfs requirement for full clones

Repo uses Git LFS for regression-test baselines (~240 MB of .mp4 files
under packages/producer/tests/**/output.mp4). Users cloning without
git-lfs installed hit a cryptic 'git-lfs: command not found' error, as
reported in heygen-com#407.

Document the requirement with install instructions and the
GIT_LFS_SKIP_SMUDGE=1 escape hatch.

* docs(readme): add Windows install instructions for git-lfs

Per review from @miguel-heygen.

* chore(ci): fix oxfmt formatting on renovate.json

Drive-by to unblock CI. Landed unformatted in heygen-com#422 because
Renovate's config-migration PR bypasses the lefthook pre-commit hook,
so every subsequent PR's `bun run format:check` (which scans the whole
repo) was failing on this file.

Author: jrusso1020

README.md

@@ -191,6 +191,31 @@ npx skills add heygen-com/hyperframes
 
 See [CONTRIBUTING.md](CONTRIBUTING.md) for guidelines.
 
+### Cloning the repo
+
+The repo uses [Git LFS](https://git-lfs.com) for golden regression-test baselines under `packages/producer/tests/**/output.mp4` (~240 MB of `.mp4` files). If you're cloning the full repo for development, install Git LFS first:
+
+```bash
+# macOS
+brew install git-lfs
+
+# Ubuntu/Debian
+sudo apt install git-lfs
+
+# Windows
+winget install GitHub.GitLFS
+# (or install Git for Windows, which bundles Git LFS as an optional component)
+
+# Then (once, per machine)
+git lfs install
+```
+
+If you hit `git-lfs filter-process: command not found` during `git clone` or `npx skills add heygen-com/hyperframes`, install Git LFS and retry. You can also skip LFS content if you only need the source files:
+
+```bash
+GIT_LFS_SKIP_SMUDGE=1 git clone https://github.com/heygen-com/hyperframes.git
+```
+
 ## License
 
 [Apache 2.0](LICENSE)