Add collective chain view and guided onboarding UX

[m0r6aN]

Summary

• Read-only constitutional chain visualization: Reform > Legitimacy > Adoption > Mutation > Delegation > Permission > Activation > Prepared Effect
• Reusable components: stage cards, edge connectors, detail rail with native deep links, empty/partial state handling
• Dismissible onboarding panel explaining each pipeline stage, persisted via localStorage
• Prepared effects rendered with orange dashed border, INERT badge, and explicit no-execution-authority text
• Thin API route over Codex chain repositories (no second data layer)
• Route: /collective/chain/[kind]/[id] supporting artifact, activation, preparedEffect, decision, delegation entrypoints

Files

• 7 new components in src/components/collective/
• 1 page route + 1 client component in src/app/collective/chain/[kind]/[id]/
• 1 API route in src/app/api/collective/chain/[kind]/[id]/
• Updated src/components/collective/index.ts barrel export

Test plan

• Navigate to /collective/chain/artifact/reform-001 - full chain renders with all 8 stages
• Navigate to /collective/chain/artifact/reform-002 - partial chain (ends at adoption), missing stages visible
• Navigate to /collective/chain/artifact/reform-005 - partial chain (ends at activation), prepared effect missing
• Click prepared effect node - detail rail shows inert warning, card shows orange border + INERT badge
• Click reform node - detail rail shows View detail link to /collective/reforms/reform-001
• Click delegation node - detail rail shows No dedicated page
• Dismiss onboarding panel, refresh page - panel stays dismissed
• Verify no action buttons or execution verbs anywhere on the surface
• Resize to mobile - detail rail stacks below chain, horizontal scroll works

Generated with Claude Code