> 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-session01-brief-movement-groups-and-calibration-metrics/implementation_summary.md). # Implementation Summary **Session ID**: `phase27-session01-brief-movement-groups-and-calibration-metrics` **Completed**: 2026-06-12 **Duration**: 0.7 hours *** ## Overview Completed Phase 27 Session 01 by making existing Trend Finder movement and retro data visible in creator-facing Brief surfaces. The session added movement-grouped Brief sections, a bounded today's pick, shared confidence band labels, and aggregate prediction calibration metrics across live Brief and Static Brief output without adding new sources, AI calls, raw archive exposure, or browser-visible private data. *** ## Deliverables ### Files Created | File | Purpose | Lines | | -------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------- | ----- | | `.spec_system/PRD/phase_27/PRD_phase_27.md` | Phase 27 PRD and progress tracker | \~280 | | `.spec_system/PRD/phase_27/session_01_brief_movement_groups_and_calibration_metrics.md` | Session 01 planning stub | \~120 | | `.spec_system/specs/phase27-session01-brief-movement-groups-and-calibration-metrics/spec.md` | Session implementation specification | \~185 | | `.spec_system/specs/phase27-session01-brief-movement-groups-and-calibration-metrics/tasks.md` | Completed 20-task checklist | \~105 | | `.spec_system/specs/phase27-session01-brief-movement-groups-and-calibration-metrics/validation.md` | Validation report with PASS result | \~150 | | `.spec_system/specs/phase27-session01-brief-movement-groups-and-calibration-metrics/security-compliance.md` | Security and GDPR review | \~90 | | `docs/ongoing-projects/alpha-radar.md` | Source mapping retained for Phase 27 traceability | \~95 | | `docs/ongoing-projects/trends-finderz.md` | Related ongoing-project notes retained for traceability | \~40 | | `.spec_system/specs/phase27-session01-brief-movement-groups-and-calibration-metrics/IMPLEMENTATION_SUMMARY.md` | Session closeout summary | \~80 | ### Files Modified | File | Changes | | ------------------------------------------------------------------------- | ----------------------------------------------------------------------------------- | | `src/extensions/trend-finder/schema.ts` | Added defaulted prediction calibration schema, types, and legacy-safe defaults. | | `scripts/lib/ai-runtime/retros.ts` | Added outcome counts, resolved hit rate, and Brier-style calibration helpers. | | `scripts/extensions/trend-finder/collector.ts` | Populated calibration for live Trend Finder collection summaries. | | `scripts/lib/ai-runtime/backtests.ts` | Populated calibration for backtest snapshots. | | `scripts/trend-finder-replay-backhistory.ts` | Populated calibration for replayed historical snapshots. | | `src/extensions/trend-finder/view-model.ts` | Added shared confidence, movement group, today's pick, and calibration view models. | | `src/extensions/trend-finder/components/trend-card.tsx` | Replaced raw confidence-only copy with shared confidence band labels. | | `src/extensions/trend-finder/views/brief-view.tsx` | Rendered today's pick, movement groups, and calibration panel. | | `scripts/extensions/trend-finder/static-brief-export.ts` | Projected bounded Static Brief fields for new Brief sections. | | `scripts/extensions/trend-finder/static-brief-renderer.ts` | Rendered projected Static Brief sections with escaped output. | | `src/extensions/trend-finder/fixtures.ts` | Added filled, empty, and omitted calibration fixture coverage. | | `scripts/lib/ai-runtime/__tests__/retros.test.ts` | Added aggregate and calibration math tests. | | `src/extensions/trend-finder/__tests__/view-model.test.ts` | Added confidence, grouping, today's pick, and calibration tests. | | `src/lib/__tests__/trend-finder-schema.test.ts` | Added legacy omitted-calibration parsing tests. | | `scripts/extensions/trend-finder/__tests__/static-brief-export.test.ts` | Added projected section assertions. | | `scripts/extensions/trend-finder/__tests__/static-brief-renderer.test.ts` | Added rendered section and empty-state assertions. | | `.spec_system/state.json` | Marked Session 01 complete and Phase 27 in progress. | | `.spec_system/PRD/PRD.md` | Marked Phase 27 in progress. | | `.spec_system/PRD/phase_27/PRD_phase_27.md` | Marked Session 01 complete and updated progress to 1/12. | | `package.json` | Bumped project version from 0.1.303 to 0.1.304. | | `README.md` | Updated displayed project version to 0.1.304. | | `docs/research/hackathon-entries.md` | Removed obsolete research entry file after Phase 27 migration. | *** ## Technical Decisions 1. **Additive calibration contract**: Added a defaulted calibration object under `predictionRetroSummary` so old payloads and snapshots continue parsing. 2. **Pending rows stay out of accuracy math**: Counted pending retros as tracked rows, but excluded them from resolved hit rate and Brier-style scoring to avoid false accuracy metrics. 3. **Projection before rendering**: Static Brief now receives bounded projected fields for today's pick, movement groups, confidence labels, and calibration instead of reading raw payload details in the renderer. *** ## Test Results | Metric | Value | | -------- | ------------- | | Tests | 3322 | | Passed | 3322 | | Failed | 0 | | Coverage | Not collected | Commands: * `bun run typecheck` - PASS * `bun run typecheck:scripts` - PASS * `bun run test` - PASS, 267 files and 3322 tests * Focused touched-area tests - PASS, 11 files and 204 tests * Focused Prettier check on touched code/test files - PASS * ASCII validation on touched code/test/session files - PASS *** ## Lessons Learned 1. Shared view-model helpers prevent Brief, cards, and Static Brief from drifting on confidence and calibration language. 2. Calibration should expose unavailable and pending-only states explicitly rather than treating missing resolved retros as zero accuracy. 3. Static report additions stay easier to audit when every browser-facing field is projected and bounded before HTML rendering. *** ## Future Considerations Items for future sessions: 1. Session 02 should reuse the shared view-model pattern for deterministic derived signals and risk flags. 2. Future time-series sessions should preserve the unavailable-state pattern below minimum sample sizes. 3. Phase 27 closeout should verify the migrated Alpha Radar mapping before deleting the source ongoing-project notes. *** ## Session Statistics * **Tasks**: 20 completed * **Files Created**: 9 * **Files Modified**: 22 * **Tests Added**: 5 focused test groups * **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. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. 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