docs(fern): restore Reference section, label v0.3.0, surface errors

[resker]

Description

Three related fixes to the Fern docs pipeline, each a small independent concern but cheap to bundle for review.

1. Restore Reference section to Fern nav

docs/reference/node-labels.md has been on main since #254 merged (2026-04-19) but is not listed in docs/index.yml (the Fern nav source-of-truth). The last successful Fern publish resolved 13 pages — exactly the count the nav declares without a Reference section — confirming the page is invisible on the live site despite being on the filesystem. Add a Reference section listing reference/node-labels.md. This is the paired-file update #254 should have included.

2. Label current version as v0.3.0

The published site shows a version label of dev because fern/docs.yml declared the only version as display-name: dev. The repo is at tagged release v0.3.0 with no divergence between released and in-flight docs, so dev is misleading. Rename to v0.3.0. When content actually diverges later (post-v0.4.0 breaking doc changes, or a doc change that only applies to the future release), re-introduce a separate dev entry alongside v0.3.0 and repoint paths.

Also drops the pre-existing /topograph/dev/index.html → /topograph/dev/ redirect since the /dev/ destination no longer exists after the rename. Not adding /dev → new-version forwarding: site has only been live since 2026-04-17 (four days), so dev-URL bookmarks are unlikely; the Fern root redirect + sidebar recover any user who lands on a 404. If dead-bookmark reports surface later, adding a one-line redirect is trivial.

3. Surface fern errors in publish workflow

The publish step used OUTPUT=$(fern generate --docs 2>&1) to capture fern's output for URL-extraction, but on non-zero exit bash -e aborted the step before the subsequent echo "$OUTPUT" ran. Every failed publish between 2026-04-17 and 2026-04-20 (three from PR merges, several manual dispatches) logged only "Process completed with exit code 1" — zero diagnostic context. Switch to tee-based streaming so fern's stdout/stderr reaches the Actions log directly on both success and failure paths. set -o pipefail preserves step-failure behavior; || true on grep ensures a missing URL in fern's output does not fail the step on its own.

Net effect: future publish failures are diagnosable from the Actions log directly. No behavior change on the success path.

Validation

• fern check passes (0 errors; 1 pre-existing NVIDIA-green-contrast warning unrelated to this PR)
• Local fern docs dev renders the sidebar with all five sections (Getting Started, Architecture, Providers, Engines, Reference)
• /topograph/reference/node-labels-and-annotations serves HTTP 200 on the local dev server
• Version label reads v0.3.0 in the rendered site
• Workflow error-surfacing behavior will be verifiable on any future failed publish (no way to fabricate a deliberate fern error locally for this test)

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes. (Validation via fern check + local fern docs dev; workflow fix is diagnostic plumbing with no behavioral change on the success path.)
• The documentation is up to date with these changes. (This PR is the documentation update — the nav restoration and version label are themselves the doc fixes.)
• All commits are signed off per DCO (git commit -s).

[resker]

@pdmack — would appreciate your review on this one since it touches fern/ and .github/workflows/publish-fern-docs.yml (both areas you've been shepherding recently). Attempted to add you as a formal reviewer but the API rejects review requests from fork PRs; this comment is the next-best thing.

[greptile-apps]

Greptile Summary

This PR makes three small, independent fixes to the Fern docs pipeline: restores the missing Reference nav entry for node-labels.md, relabels the single version from dev to v0.3.0, and replaces the silent-on-failure output-capture pattern in the publish workflow with tee-based streaming so errors are visible in the Actions log. All changes are well-scoped and correctly reasoned.

Confidence Score: 5/5

Safe to merge — all three changes are low-risk doc/config fixes with clear rationale and no behavioral regression on the success path.

No P0 or P1 findings. The workflow change correctly preserves failure behavior via pipefail and tee; the nav and version-label changes are straightforward YAML edits validated with fern check and local dev server.

No files require special attention.

Important Files Changed

Filename	Overview
.github/workflows/publish-fern-docs.yml	Replaces captured-variable pattern with tee-based streaming so fern errors appear in the Actions log on failure; pipefail + `
docs/index.yml	Adds the missing Reference section pointing to reference/node-labels.md, which already exists on main but was absent from the nav.
fern/docs.yml	Renames version display label from dev to v0.3.0 and removes the now-stale /topograph/dev/index.html redirect.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[fern generate --docs] -->|stdout plus stderr| B[tee fern-output.log]
    B -->|stream| C[Actions log visible on success AND failure]
    B -->|write| D[fern-output.log on disk]
    A -->|exit code via pipefail| E{Step exit check}
    E -->|non-zero| F[Step fails - log already streamed]
    E -->|zero| G[grep for Published URL]
    D --> G
    G -->|found| H[Write URL to GITHUB_STEP_SUMMARY]
    G -->|not found via or true| I[Skip summary, step continues]

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[resker]

@pdmack - please advise