Prerequisites

• I searched existing issues
• I can reproduce this issue

Bug Description

Two issues in the Fern preview pipeline:

1. Preview build missing frozen version content — fern/versions/v1.2.0.yml, v1.3.0.yml, v1.4.0.yml reference vX.Y.Z-content/ directories populated by git archive in the publish workflow. The preview build workflow does not include this step, so the artifact ships empty directories. Preview generation will fail once DOCS_FERN_TOKEN is provisioned.

2. Preview comment swallows fern errors — OUTPUT=$(fern generate ... 2>&1) with bash -e means the shell aborts before echo "$OUTPUT" runs on failure, making errors invisible in the CI log.

Same issues found and fixed in NVIDIA/topograph#322.

Component

Documentation/CI

Steps to Reproduce

1. Have versioned docs in fern/versions/
2. Open a PR touching docs/ — preview build artifact is missing version content
3. If fern generate fails, error output is swallowed

Environment

• NVSentinel version: all (since versioned docs were added)
• Kubernetes version: N/A
• Deployment method: N/A

Logs/Output

# Preview generation fails silently because version content dirs are empty
# fern generate errors swallowed by OUTPUT=$(...) pattern