chore(roadmap): adopt roadmap-check, date and link the roadmap pile (work-down session 9b)

[marlinjai]

Work-down session 9b (framer-clone + clearify plan reconciliation) of the one-home-per-open-item plan (knowledge-base/plans/2026-09-07-one-home-per-open-item.md). clearify is dormant (no commits since 2026-06-07), so this pull request is reconciliation only: roadmap and plan-frontmatter edits, no product code.

What this does

• roadmap-check added as a new .github/workflows/verify.yml (max-age 30) and wired into package.json as check:roadmap.
• 45 open checkbox lines re-read and re-dated (2026-09-10). All are live, unshipped v2.0+ roadmap items; checked against package.json version 2.1.0 and a source-tree search for each named feature (TryItPanel, AuthManager, in-place editing, i18n, and so on) to confirm none were secretly already built.
• 2 lines deleted as not wanted (listed below, per this session's contract that a deletion goes in the pull request body so it can be vetoed in review).
• 8 previously-unlinked draft plans (144 to 193 days old, each failing roadmap-check's "unlinked draft" rule) now linked from an open roadmap line so the check can see they are still wanted: openapi-auth-ui-design, versioned-docs-architecture, edge-preview-layer-design, ai-integration-design, plugin-system-design, in-place-editing-plan (the v2.5 section already carried a prose pointer to it in a > See ... line, but that line is not an open checkbox item so the checker didn't count it; now linked from an actual open line), and clearify-iac-alignment plus visual-diagram-editor-plan (neither had any roadmap section at all; both now sit under a new "Deferred" heading).
• 1 more HOMED line under the same "Deferred" heading, from this session's own knowledge-base backlog note: disposition of branch wip/hub-paths-reports-2026-04-18 (still present on origin, preserves 4 hub-model report files). Branch decisions are Marlin's, not executed here.

Deleted lines (not re-added; not wanted)

• "Phase 4 (git-gateway for deployed sites): out of scope" — the line's own text says it is out of scope, so it was never actually an open item.
• "API playground — interactive request builder (planned for v1.9)" under v2.1 Power Features — a stale duplicate of the full "API Playground" section already tracked under v2.0 (same feature, same plan link).

Local check now prints: 46 open lines, 8 linked plans, 14 plan files scanned, no drift.

What Marlin needs to decide

• The wip/hub-paths-reports-2026-04-18 branch: keep as-is, turn into a proper pull request, or drop it.
• Everything else on the roadmap is unchanged product direction, just now dated and check-clean.

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