[Arthurvdv]

Closes #139

<baseUrl>/ becomes the landing page of the dashboard. The grid of the first stage moves to stages/<slug>/, unchanged, and every other address keeps its meaning (#136 section 4).

What changes

• site/content/_index.md holds the title, the lead (also the meta and Open Graph description) and three paragraphs saying what the site is and why it exists. An organization edits Markdown, not a layout.
• site/layouts/index.html renders that text plus these parts, built from rulebook.json:
  • the facts: rules, analyzers, levels, stages, last published, engine ref;
  • a three-step path for developers, linking setup/#levels, setup/#stage-<first> and setup/#al-project. The first step links the level pages and makes no claim about their order;
  • entry cards: one per stage and per level with its description, plus Set up an AL project, How this works and Help.
  • The page's <main> is <main class="page page-landing" data-rulebook-landing>.
• The stage switcher's first link goes to stages/<first>/. aria-current is set only on a stage page's own link. matrix.js is not loaded on /.
• There is no hash forwarding: an old /#source=... bookmark opens the landing page.
• Publish: Build-RulebookSite reads stages[0].slug from the data file, checks stages/<slug>/index.html for data-rulebook-matrix and returns MarkerPage. The warning names that page. The plain index.html that Publish writes without the site is untouched.
• CI publish-action:
  • the marker and 628-row checks move to stages/default/index.html;
  • index.html must carry data-rulebook-landing and no matrix marker;
  • the site.enabled false job also rejects the landing attribute.
• Docs:
  • docs/dashboard.md, ARCHITECTURE 6.4 and the URL table, reference/naming.md;
  • D54 gets a new Status line (in the file and in the index row); its text stays as written;
  • user pages: dashboard.md (sections 1, 2, 5, 7), getting-started.md, hosting.md, changing-a-rule.md;
  • release notes.

Notes

• The page count stays 39 for the fixture and 637 for the template: the landing page replaces the content of index.html. WP16: landing page at /; the matrix moves to stages/<slug>/ #139 says the count "changes by exactly one", which does not hold; it changes with WP16: in-context help (How this works page, leads, legend tooltips, deep links to alcops.dev) #143 (comment on WP16: landing page at /; the matrix moves to stages/<slug>/ #139).
• The "How this works" card points at the header's Help target (docsUrl) until how-it-works/ exists (WP16: in-context help (How this works page, leads, legend tooltips, deep links to alcops.dev) #143). The Help card points at docs.home.
• An organization that edited content/_index.md keeps its old front matter after the update. The user page tells it to take the new text from the template diff.
• Screenshots (1280 and 390 px, light and dark): WP16: landing page at /; the matrix moves to stages/<slug>/ #139 (comment)

Verification

• Pester, all passed, including the real-Hugo case: Rulebook.Site 55, Publish.Action 52, Rulebook.Publish 100, Rulebook.Deploy 76, Rulebook.Template 77, Docs 340. Site, Publish.Action and Docs were re-run after the review fixes.
• node --test tests/site/: 21 passed.
• Playwright on a fixture build, 31 of 31 checks passed:
  • / has no matrix and renders the cards, facts and steps in both colour modes, with no horizontal scroll at 390 px (also without JavaScript);
  • on stages/default/ the hash filters work, the stage links keep the hash, and a cell click adds a change;
  • /#source=override stays on the landing page;
  • no request leaves 127.0.0.1.
• Review: Sonnet code-review round 1 found no must-fix; three should-fix items (documentation and wording) and the nits are applied.

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