feat: autopilot confidence revamp — narrative titles, modal redesign, evidence chips

[hopeatina]

Summary

• Narrative title pipeline: Replaces system-speak titles with human-readable narratives — prioritizes user_summary → task_title → event-specific templates (e.g., "Working on {task}" instead of "Autopilot dispatched slice for workstream")
• Modal redesign: Zero empty modals via synthesized fallback content; spawn guard, raw JSON, and provenance gated behind devMode; blocked states answer "what's wrong and what can I do?"
• Internal event filtering: Hides autopilot_transition, heartbeat, orchestrator_selection, spawn_guard_* from non-dev users
• Autopilot burst summary: Clusters 3+ autopilot events by workstream + 5-min window into expandable summary cards with status counts
• Evidence chips: PR, commit, test, doc, artifact badges extracted from metadata on timeline cards
• Canonical autopilot state: Backend getCanonicalAutopilotState() provides unified truth for Activity, Mission Control, and Agent panels
• Skip & Continue: New POST /orgx/api/autopilot/skip endpoint advances queue, emits skip event, triggers next tick
• Session completion events: Explicit session_completed event for deterministic agent panel status transitions
• Artifact type alignment: Frontend humanizeArtifactType() now maps all 14 canonical atomic unit types from artifact-domain-schemas.ts
• UX audit polish: 3 iterations — spacing standardization (gap/dot sizes), color token alignment, extracted resolveArtifactColor() helper, text-micro/text-primary design tokens

Files changed (14 files, +1081/-130)

Area	Files
Frontend – Activity	ActivityTimeline.tsx, ActivityTimelineItem.tsx, ActivityDetailSummary.tsx, activityVisuals.tsx, AutopilotBurstSummary.tsx (new)
Frontend – Mission Control	ArtifactGallery.tsx, InitiativeSection.tsx
Frontend – Agent Panel	AgentsChatsPanel.tsx
Frontend – Shared	App.tsx, humanize.ts
Backend – Engine	auto-continue-engine.ts
Backend – Routes	live-snapshot.ts, mission-control-actions.ts, index.ts

Test plan

• npm --prefix dashboard run build passes
• npm run build:core passes
• Verify feed cards show narrative titles (not system-speak)
• Verify empty modals now show synthesized content
• Verify devMode=true still shows spawn guard, JSON, provenance
• Verify devMode=false hides internal events
• Verify autopilot toggle does NOT empty the activity feed
• Verify autopilot burst summary appears for clustered events (3+)
• Verify evidence chips render on completed/artifact cards
• Cross-panel consistency: start autopilot → Activity, Mission Control, Agent panel show same state

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