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TASKSET 8 — what landed

• lore/src/app/overview/page.tsx — new landing. Hero stats (Total / Pending Review / Success Rate / Active Agents), recent decisions table (top 10, links to /search), decisions-by-type list (top 8 sorted), governance summary card with a one-click jump to /governance. All three fetches go through the Result<T> seam; failures surface via DegradedBanner, never fake-empty.
• lore/src/app/page.tsx — root now redirects to /overview instead of /search.
• lore/src/components/knowledge/collapsible-card.tsx — small client component disclosure. Default-open; chevron + button header; aria-expanded for screen readers.
• lore/src/app/governance/page.tsx — Roles & Permissions card converted to CollapsibleCard; the existing “Edit on GitHub” link (added back in TASKSET 2) remains.
• lore/src/components/layout/sidebar.tsx — leading Overview entry using a LayoutDashboard icon. Existing entries unchanged.

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Decisions worth noting

• Overview is read-only and link-driven. No new mutations. Every action goes via existing pages (/search, /governance, /decisions/:id). Keeps the surface coherent — one page, one job.
• Collapsible default-open. Repeat visitors get the affordance; first-timers never miss the matrix. The opposite default would punish discovery.
• No “favourite repo” persistence yet. The page reads repo from searchParams and falls back to devarno-cloud/kb. Persisted preference (cookie or airlock metadata) is a follow-up; not in this campaign.

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Verification done

• npx tsc --noEmit clean.
• npx next build clean. New /overview route at 1.77 kB; existing /governance grew 845 B → 1.19 kB for the collapsible client chunk.
• All four Result failure modes covered on /overview via the shared DegradedBanner.
• Governance page still links to https://github.com/<owner>/blob/main/.agents/COUNCIL.yaml (no change to that link).

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What does NOT exist yet

• No favourite-repo persistence.
• No “your recent activity” panel — would need a per-user index that doesn’t exist server-side.
• No CAIRN cross-link on /overview (graduation backlinks live on decision detail; surfacing aggregate cairn signal here is a separate decision).

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Campaign-level note

• Live pebble seam smoke run (TASKSET 2 punch list).
• Upstream tool_args typo fix in KnowledgeProvider._handle_log_decision (TASKSET 7 inline comment); when fixed, swap the direct GitHub call in cairn_graduation_service.py for a ToolCall invocation.
• Reconciliation worker for the GitHub-write / DB-commit window (TASKSET 7).
• NATS audit emission for graduations (TASKSET 7).
• Decline-graduation reverse path (TASKSET 7).
• Decay worker (TASKSET 4 — currently query-time filter only).
• Workspace linking for @devarno/sdk-charts to retire the duplicated graph-primitive.tsx (TASKSETs 3 & 6).