> 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/phase29-session11-industry-events-rollup/implementation_summary.md).

# Implementation Summary

**Session ID**: `phase29-session11-industry-events-rollup` **Completed**: 2026-06-21 **Duration**: 0.6 hours

***

## Overview

Completed the Trend Finder industry-events rollup. The session derives bounded event rows from existing RSS and Google News evidence only, requires at least two independent publishers, keeps deterministic fallback summaries before accepting validator-gated analyst copy, and surfaces the browser-safe rows in live models, compact Brief output, static Brief rendering, QA, payload-size reporting, and documentation.

***

## Deliverables

### Files Created

| File                                                                     | Purpose                                                                                                                                                             | Lines |
| ------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----- |
| `scripts/extensions/trend-finder/industry-events.ts`                     | Industry-event derivation, publisher identity checks, clustering, AI merge fallback, row bounds, and warning output.                                                | 729   |
| `scripts/extensions/trend-finder/__tests__/industry-events.test.ts`      | Unit coverage for reviewed-source filtering, publisher identity, single-publisher suppression, two-publisher publication, ordering, bounds, and AI merge rejection. | 337   |
| `scripts/extensions/trend-finder/__tests__/measure-payload-size.test.ts` | Payload-size CLI coverage for always-visible `data.industryEvents` branch reporting.                                                                                | 81    |

### Files Modified

| File                                                                      | Changes                                                                                                             |
| ------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------- |
| `scripts/lib/ai-runtime/trend-analyst.ts`                                 | Adds optional industry-event brief candidates, output validation, and deterministic fallback merge behavior.        |
| `scripts/extensions/trend-finder/collector.ts`                            | Wires preliminary and final industry-event derivation with duplicate assembly prevention and safe warning fallback. |
| `src/extensions/trend-finder/schema.ts`                                   | Adds `TrendIndustryEvent` constants, schemas, defaults, root branch, and reference validation.                      |
| `src/extensions/trend-finder/view-model.ts`                               | Adds industry-event view models, labels, empty state, cited evidence projection, and deterministic sorting.         |
| `src/extensions/trend-finder/brief-export-model.ts`                       | Adds industry events to compact Brief export data and Markdown output.                                              |
| `scripts/extensions/trend-finder/static-brief-export.ts`                  | Projects industry events into static Brief report data.                                                             |
| `scripts/extensions/trend-finder/static-brief-renderer.ts`                | Renders the static Brief industry-events section with bounded citations and empty state.                            |
| `scripts/extensions/trend-finder/static-brief-qa.ts`                      | Adds required section, structure, citation, and privacy checks for industry events.                                 |
| `scripts/extensions/trend-finder/measure-payload-size.ts`                 | Tracks `data.industryEvents` as an always-visible browser payload branch.                                           |
| `scripts/extensions/trend-finder/required-derived-fields.ts`              | Adds `industryEvents` to required generated-payload branch closeout checks.                                         |
| `src/extensions/trend-finder/fixtures.ts`                                 | Adds empty industry-event branches to typed fixtures.                                                               |
| `scripts/extensions/trend-finder/__tests__/collector.test.ts`             | Covers collector integration, no source widening, valid payload output, and failure fallback.                       |
| `scripts/lib/ai-runtime/__tests__/trend-analyst.test.ts`                  | Covers industry-event analyst request, invalid reference rejection, and fallback merge behavior.                    |
| `src/lib/__tests__/trend-finder-schema.test.ts`                           | Covers defaults, valid rows, unknown references, and citation bounds.                                               |
| `src/extensions/trend-finder/__tests__/view-model.test.ts`                | Covers labels, ordering, empty state, related topics, and cited evidence links.                                     |
| `scripts/extensions/trend-finder/__tests__/static-brief-export.test.ts`   | Covers static projection and bounded privacy-safe citations.                                                        |
| `scripts/extensions/trend-finder/__tests__/static-brief-renderer.test.ts` | Covers rendered section, escaping, citations, and empty state.                                                      |
| `scripts/extensions/trend-finder/__tests__/static-brief-qa.test.ts`       | Covers blocking QA for missing citations and private-looking strings.                                               |
| `docs/extensions/trend-finder-pipeline.md`                                | Documents the derivation step, reviewed source boundary, two-publisher gate, fallback, and privacy behavior.        |
| `docs/extensions/trend-finder-ui-surfaces.md`                             | Documents live, compact Brief, and static Brief industry-event surfaces and empty states.                           |

***

## Technical Decisions

1. **Reviewed news sources only**: Event derivation accepts `rss-ai-news` and `google-ai-news` evidence and does not add collectors, media, transcripts, or raw article access.
2. **Two-publisher publication gate**: Clusters are suppressed until at least two independent publisher identities support the event.
3. **Deterministic fallback first**: Shared-token clustering and fallback summaries produce bounded rows before optional analyst copy is merged.
4. **Validator-gated analyst output**: Analyst summaries can replace fallback copy only when event IDs and evidence IDs match known candidates.
5. **Browser-safe projection**: Event rows expose bounded labels, summaries, IDs, counts, reason codes, related topics, and safe public citation links only.

***

## Test Results

| Metric   | Value         |
| -------- | ------------- |
| Tests    | 3824          |
| Passed   | 3824          |
| Coverage | Not collected |

Validation also passed app typecheck, script typecheck, lint, whitespace checks, targeted Prettier checks, payload-size reporting at 14,138 bytes, static Brief privacy suites, focused Vitest suites, and ASCII/LF validation.

***

## Lessons Learned

1. Publisher identity must prefer reviewed source-local metadata and only fall back to public hosts when the metadata is missing.
2. Derived report lenses need explicit unavailable and empty states so sparse news cycles do not weaken corroboration rules.
3. Payload-size tooling should report high-value branches even when a legacy fixture omits the branch or the branch is small.

***

## Future Considerations

Items for future sessions:

1. Reuse the two-publisher gate and validator-gated summary pattern for the upcoming security lens.
2. Keep static Brief privacy and payload-size checks close to every new browser-visible derived field.
3. Avoid expanding industry-events sourcing until a separate compliance session approves any new boundary.

***

## Session Statistics

* **Tasks**: 21 completed
* **Files Created**: 3 source/test files plus session workflow artifacts
* **Files Modified**: 20 source/test/doc files plus tracking metadata
* **Tests Added**: 7 focused test areas
* **Blockers**: 0 resolved


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