docs: Fix 404 helm-charts links on Platform Helm page [EDU-1330]

[robsyme]

Fixes EDU-1330. Reported by a customer via FD-7794.

Problem

All four seqeralabs/helm-charts links on the Platform Enterprise Helm installation page 404, in every doc version that carries the page (next, 26.1, 25.3, 25.2, 25.1) — 20 dead links. They've been broken since 2026-07-20.

Two independent upstream changes compounded:

1. Tag rename. helm-charts renamed its bare-numeric tags to <chart>-<version>. Of 242 tags, only 0.16.1 is still un-prefixed, so /tree/0.36.1/... can never resolve — and GitHub doesn't redirect a missing ref, so it fails hard.
2. Monorepo restructure. The platform chart moved from platform/ to charts/platform/ between platform-0.20.1 and platform-0.30.0. This is why even the next docs, which did carry the platform- prefix, still 404.

#1660 substituted 0.20.1 → 0.36.1 in the URLs and changed nothing else, inheriting both the missing prefix and the pre-monorepo path. It also preserved a pre-existing inconsistency — the next copy used platform-0.20.1 while the versioned copies used bare 0.20.1 — so after the bump the two sets fail for different reasons.

Change

Adds the tag prefix and the charts/ path segment:

- https://github.com/seqeralabs/helm-charts/blob/0.36.1/platform/examples/kustomize/values.yaml
+ https://github.com/seqeralabs/helm-charts/blob/platform-0.36.1/charts/platform/examples/kustomize/values.yaml

The studios and pipeline-optimization links are deliberately untouched — those charts kept the platform/charts/<name> layout and already resolve, so a repo-wide sweep would have broken them.

Verification

Status-checked every unique helm-charts URL in the repo before and after. 6 of 15 were 404; all 12 distinct URLs now return 200.

grep -rhno "https://github.com/seqeralabs/helm-charts/[a-zA-Z0-9./_-]*" --exclude-dir=.git . \
  | sed 's/^[0-9]*://' | sort -u \
  | while read -r u; do echo "$(curl -s -o /dev/null -w '%{http_code}' "$u")  $u"; done | sort

The one remaining 301 is GitHub redirecting tree → blob for examples/seqera-ai, which is a file. Pre-existing and harmless.

Why CI didn't catch this

Worth flagging separately, because it's the more interesting finding. links.yml runs lychee over the docs, but its last output was #440 on 2025-02-08 and all 218 runs in the retained history failed. Three independent defects:

• No pull_request trigger. Triggers are schedule (Sunday 18:00), workflow_dispatch, repository_dispatch. Even a working checker could not have blocked docs: Update platform helm chart to latest #1660 — at best it would have complained the following Sunday. Only check-internal-links.yml gates PRs, and that covers internal links only.
• lychee rejects its own arguments. --base . has been there since the workflow was written in July 2024, but lychee 2.x requires an absolute path or URL and moved root-relative local resolution to --root-dir. The binary exits 2 after ~200ms without checking a link. Because that's an arg-parse error rather than a link failure, steps.lychee.outputs.exit_code is never set, so create-issue-from-file is skipped too — no report issue, no signal at all.
• The glob misses 94% of the docs. Args end in './**/*.mdx'; the enterprise docs are 1284 .md against 75 .mdx. platform-helm.md was never in scope.

Fixing all three (add pull_request, swap --base . for --root-dir "$GITHUB_WORKSPACE", glob './**/*.md*') is what would actually catch the next one. Not done here — it's a separate change, and the first successful run will surface 18 months of accumulated rot, so it'll likely need an allowlist or a soft-fail period before it can gate PRs.

Also not addressed

Editorial, tracked on EDU-1330:

• The chart version is copy-pasted into four URLs across five files. A Docusaurus constant would make the bump a one-liner.
• The 25.1/25.2/25.3 pages point at chart 0.36.1 (appVersion v26.1.3), which postdates those releases.
• 0.36.1 is already behind — 0.37.0 and 0.38.0 (appVersion v26.1.4) exist.

🤖 Generated with Claude Code

[netlify]

✅ Deploy Preview for seqera-docs ready!

Name	Link
🔨 Latest commit	debbaee
🔍 Latest deploy log	https://app.netlify.com/projects/seqera-docs/deploys/6a70ca0d0dc00b0008f78996
😎 Deploy Preview	https://deploy-preview-1706--seqera-docs.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.