🏗️🔧：make the health file import survive being run

[DerekNonGeneric]

compile.siteifyHealthFiles imports our five community health files from OpenINF/.github and turns them into site pages. compile.buildPortal only invokes it when those files are missing, so in practice nothing ran it — and its output had drifted into a state that no longer builds.

Wanting to pick up OpenINF/.github#883 (the matrix.to fix) is what exposed that.

The task

• Permalinks lost their trailing slash. Eleventy v3 reads permalink: /about/vision as a request to write an extensionless file and makes it a fatal error, so the build died on the first health file. Every committed copy carries the slash, so these had been repaired by hand at some point and the task never learned.

• The title heading was stripped with a global regex. /^## (.*)\n\n/gm was survivable only while ## appeared exactly once per file. OpenINF/.github#885 moves these documents to an h1 title with ## sections, at which point that pattern eats the document:

  CONTRIBUTING.md headings: 12
    old /gm regex → 3   (lost 9)  ← every section heading destroyed
    new regex     → 11  (lost 1)  ← title only
  

  It now strips the first heading only, and reads either level, so the import behaves the same before and after chore(deps): bump % actions/checkout action@3.5.3 #885.

What it deliberately does not do

Earlier revisions of this PR promoted heading levels and rewrote repo-relative links in the imported prose. Both are gone. The site should not be editing documents it does not own — the divergence is invisible to anyone reading the source, and every future upstream change that upset the validator would have added another rewrite rule here.

Those two problems are fixed at the source instead, in OpenINF/.github#884 and OpenINF/.github#885. What remains here — frontmatter, and lifting the title that the layout re-renders — is packaging, not editing.

Verification

Each imported page is now its upstream file unchanged, but for the frontmatter and that one title heading:

SUPPORT.md             FAITHFUL  headings 2 -> 1 (title only)
SECURITY.md            FAITHFUL  headings 3 -> 2 (title only)
CONTRIBUTING.md        FAITHFUL  headings 12 -> 11 (title only)
CODE_OF_CONDUCT.md     FAITHFUL  headings 1 -> 0 (title only)
VISION.md              FAITHFUL  headings 1 -> 0 (title only)

Pages come out with a contiguous outline and no repeated title:

<h1>Support • Frequently Asked Questions</h1>
<h2>Resources</h2>

nps build succeeds again, verify.all passes, and the W3C validator is clean across all 27 built pages.

Note

The second commit is pure generated output — the first import since #883, #884, and #885 landed.

A follow-up, #1786, corrects verify.htmlValidForVNU, which has only ever validated the home page — that is how these errors stayed hidden. It is stacked on this branch and needs it to land green.

List of any relevant issue numbers: none

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