> For the complete documentation index, see [llms.txt](https://ai-os-and-trend-finder.gitbook.io/ai-os-and-trend-finder-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ai-os-and-trend-finder.gitbook.io/ai-os-and-trend-finder-docs/.spec_system/archive/sessions/phase27-session07-convergence-detection-and-trajectory-visuals/implementation_summary.md). # Implementation Summary **Session ID**: `phase27-session07-convergence-detection-and-trajectory-visuals` **Completed**: 2026-06-13 **Duration**: 0.5 hours *** ## Overview Completed Phase 27 Session 07 by adding deterministic cross-source convergence detection and compact score trajectory visuals to Trend Finder. The shipped work derives lead-lag timing only from linked evidence timestamps, publishes bounded browser-safe schema branches, renders selected-topic timeline and actual-score trajectory panels, and validates legacy payload compatibility with focused and full test coverage. *** ## Deliverables ### Files Created | File | Purpose | Lines | | ------------------------------------------------------------------------------------------------------------- | ---------------------------------------------- | ----- | | `scripts/lib/ai-runtime/convergence.ts` | Pure convergence helper and aggregate counters | \~325 | | `scripts/lib/ai-runtime/__tests__/convergence.test.ts` | Convergence helper unit coverage | \~227 | | `src/extensions/trend-finder/components/convergence-timeline.tsx` | Selected-topic lead-lag timeline component | \~98 | | `src/extensions/trend-finder/components/score-trajectory.tsx` | Actual-point score trajectory component | \~103 | | `src/extensions/trend-finder/components/__tests__/convergence-timeline.test.tsx` | Timeline component tests | \~43 | | `src/extensions/trend-finder/components/__tests__/score-trajectory.test.tsx` | Trajectory component tests | \~42 | | `.spec_system/specs/phase27-session07-convergence-detection-and-trajectory-visuals/IMPLEMENTATION_SUMMARY.md` | Session closeout summary | \~90 | ### Files Modified | File | Changes | | ------------------------------------------------------------- | ------------------------------------------------------------------------------ | | `scripts/lib/ai-runtime/scoring.ts` | Added bounded actual score trajectory output | | `scripts/extensions/trend-finder/collector.ts` | Attached convergence and sanitized trace counters | | `src/extensions/trend-finder/schema.ts` | Added additive convergence and trajectory schemas/defaults | | `src/extensions/trend-finder/view-model.ts` | Added labels, lags, SVG points, empty states, and accessibility projections | | `src/extensions/trend-finder/components/signal-radar.tsx` | Rendered timeline and trajectory in the selected-topic inspector | | `src/extensions/trend-finder/fixtures.ts` | Added detected, unavailable, single-source, and missing-history fixture states | | `src/data/live-data.example.json` | Added compact additive examples for new payload branches | | `scripts/extensions/trend-finder/__tests__/collector.test.ts` | Covered collector convergence attachment and sanitized counters | | `scripts/lib/ai-runtime/__tests__/scoring.test.ts` | Covered trajectory bounds and no forecast point estimates | | `src/lib/__tests__/trend-finder-schema.test.ts` | Covered defaults, bounds, malformed branches, and legacy parsing | | `src/extensions/trend-finder/__tests__/view-model.test.ts` | Covered convergence labels, trajectory points, and extrapolation labels | | `src/lib/__tests__/trend-finder-dashboard.test.tsx` | Updated dashboard fixture for new selected-topic projections | | `.spec_system/state.json` | Marked Session 07 complete and cleared current session | | `.spec_system/PRD/phase_27/PRD_phase_27.md` | Recorded Session 07 completion and 7/12 phase progress | | `package.json` | Bumped version to `0.1.310` | | `README.md` | Synced visible version line to `0.1.310` | *** ## Technical Decisions 1. **Evidence-only convergence**: Convergence uses linked evidence timestamps and source metadata already present in the run, with invalid or future timestamps producing explicit unavailable states. 2. **Actual-point trajectory contract**: Score trajectory publishes historical and current score points only; slope is rendered as a labeled extrapolation guide in the UI. 3. **Additive browser schema**: New payload branches default to unavailable or missing-history states so old fixtures and generated payloads keep parsing. *** ## Test Results | Metric | Value | | -------- | --------------------------------- | | Tests | 277 test files, 3407 Vitest tests | | Passed | 277 test files, 3407 Vitest tests | | Coverage | Not collected | *** ## Lessons Learned 1. Keep timing derivations tied to source first-seen timestamps, not every evidence timestamp, to avoid overstating convergence. 2. Dense selected-topic visuals need fixed dimensions, truncated labels, and accessible summaries from the view-model layer. *** ## Future Considerations Items for future sessions: 1. Session 08 can build dated prediction and Story Log behavior on top of the now-available trajectory and lifecycle context. 2. Static Brief export rendering for convergence remains deferred to the documentation and release closeout session. *** ## Session Statistics * **Tasks**: 21 completed * **Files Created**: 7 * **Files Modified**: 16 * **Tests Added**: 3 new test files; 4 existing suites expanded * **Blockers**: 0 resolved --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. 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