Review: P13/P18 user guides

Brief 8879953; docs base 630cc09. Product sources: backend 997cd82, frontend 6c8a4521. The two existing user pages explain the evidence-derived graph, readable-record coverage, fixed limits and truncation, accessible navigation, manual refresh and separate free-quote/paid-run actions. Pivot documentation distinguishes server-supplied tiers from score and ownership, historical missing levels, and unavailable probable/verified-rare-favicon assignments. P19 is not described as available.

Validation for this exact Markdown revision: run npm run typecheck, then npm run build; inspect generated investigation/Pivot anchors and cross-links, then git diff --check. Commands and their final results are provided with the local commit handoff. All authored Markdown, including this report, is finalized before the final build so that review pages receive the same MDX validation as user pages. Logs: /tmp/profundis-docs-graph-tiers-types.log and /tmp/profundis-docs-graph-tiers-build.log.

Independent conformity: research_fix. Quality: root. Publication remains with the coordinator; no push from this worktree.