> 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-session09-competitor-lens-and-creator-angle-pack/implementation_summary.md).

# Implementation Summary

**Session ID**: `phase27-session09-competitor-lens-and-creator-angle-pack` **Completed**: 2026-06-13 **Duration**: 1.0 hours

***

## Overview

Completed Phase 27 Session 09 by extending Trend Finder's Creator Lens with a bounded public competitor or adjacent-channel list, then carrying that saved lens signal through fail-closed config validation, collector-time YouTube channel-title matching, browser-safe evidence chips, analyst angle fields, deterministic fallback copy, Trend Card and Brief rendering, and static Brief projection.

***

## Deliverables

### Files Created

| File                                                                                                  | Purpose                                                                                     | Lines |
| ----------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------- | ----- |
| `scripts/extensions/trend-finder/competitor-matching.ts`                                              | Normalize bounded competitor names and flag matching public YouTube channel-title entities. | 93    |
| `scripts/extensions/trend-finder/__tests__/competitor-matching.test.ts`                               | Coverage for competitor normalization, caps, matching, and non-YouTube exclusions.          | 91    |
| `src/extensions/trend-finder/creator-lens-competitors.ts`                                             | Shared browser/script competitor bounds, parsing, dedupe, and key normalization helpers.    | 144   |
| `.spec_system/specs/phase27-session09-competitor-lens-and-creator-angle-pack/spec.md`                 | Session specification.                                                                      | 350   |
| `.spec_system/specs/phase27-session09-competitor-lens-and-creator-angle-pack/tasks.md`                | Completed task checklist.                                                                   | 98    |
| `.spec_system/specs/phase27-session09-competitor-lens-and-creator-angle-pack/implementation-notes.md` | Session implementation log and validation command record.                                   | 596   |
| `.spec_system/specs/phase27-session09-competitor-lens-and-creator-angle-pack/security-compliance.md`  | Security and GDPR validation report.                                                        | 96    |
| `.spec_system/specs/phase27-session09-competitor-lens-and-creator-angle-pack/validation.md`           | Independent validation report.                                                              | 252   |

### Files Modified

| File                                                                              | Changes                                                                                                           |
| --------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------- |
| `.spec_system/PRD/phase_27/PRD_phase_27.md`                                       | Marked Session 09 complete and updated Phase 27 progress.                                                         |
| `.spec_system/state.json`                                                         | Marked current session complete, cleared active session, and appended completion history.                         |
| `README.md`                                                                       | Synced visible version line to `0.1.312`.                                                                         |
| `package.json`                                                                    | Bumped version from `0.1.311` to `0.1.312`.                                                                       |
| `src/extensions/trend-finder/schema.ts`                                           | Added Creator Lens competitors, evidence competitor metadata, and angle-pack topic fields with additive defaults. |
| `src/extensions/trend-finder/creator-lens-storage.ts`                             | Added competitor draft parsing, migration, persistence, issue mapping, and dirty-state keying.                    |
| `src/extensions/trend-finder/hooks/use-creator-lens-draft.ts`                     | Added competitor save payload support and in-flight save safeguards.                                              |
| `src/extensions/trend-finder/components/creator-lens-panel.tsx`                   | Added accessible competitor-list controls and validation feedback.                                                |
| `scripts/lib/ai-runtime/creator-lens-config.ts`                                   | Added saved-config competitor validation with strict unknown-field rejection.                                     |
| `scripts/lib/trend-finder-lens-bridge.ts`                                         | Preserved bridge trust boundary while accepting validated competitor payloads.                                    |
| `scripts/extensions/trend-finder/sources/apify-normalizers.ts`                    | Added default competitor metadata to normalized evidence pairs.                                                   |
| `scripts/extensions/trend-finder/collector.ts`                                    | Applied competitor matching, cache projection, angle fallback, warnings, and browser payload assembly.            |
| `scripts/extensions/trend-finder/topics.ts`                                       | Added deterministic fallback angle fields to frequency-based topics.                                              |
| `scripts/lib/ai-runtime/trend-analyst.ts`                                         | Extended analyst input, prompt, schema hint, output validation, and grounding checks.                             |
| `scripts/lib/ai-runtime/scoring.ts`                                               | Added deterministic scoring fallback angle builders and pass-through fields.                                      |
| `scripts/lib/ai-runtime/snapshots.ts`                                             | Preserved new angle fields in snapshot compatibility paths.                                                       |
| `src/extensions/trend-finder/view-model.ts`                                       | Projected competitor chips and copy-ready angle fields with bounded text.                                         |
| `src/extensions/trend-finder/components/evidence-links.tsx`                       | Rendered accessible competitor evidence chips.                                                                    |
| `src/extensions/trend-finder/components/signal-workbench-table.tsx`               | Rendered competitor flags in expanded Workbench evidence rows.                                                    |
| `src/extensions/trend-finder/signal-workbench-model.ts`                           | Included competitor metadata in Workbench search/projection.                                                      |
| `src/extensions/trend-finder/components/trend-card.tsx`                           | Rendered the copy-ready angle pack on trend cards.                                                                |
| `src/extensions/trend-finder/views/brief-view.tsx`                                | Rendered angle-pack copy on dashboard Brief opportunity cards.                                                    |
| `scripts/extensions/trend-finder/static-brief-export.ts`                          | Projected privacy-safe angle-pack and competitor evidence fields into static Brief rows.                          |
| `scripts/extensions/trend-finder/static-brief-renderer.ts`                        | Rendered escaped static Brief angle blocks and competitor chips.                                                  |
| `scripts/lib/__tests__/trend-finder-lens-bridge.test.ts`                          | Added bridge competitor payload and rejection coverage.                                                           |
| `scripts/lib/ai-runtime/__tests__/creator-lens-config.test.ts`                    | Added saved config normalization, cap, and legacy migration tests.                                                |
| `scripts/lib/ai-runtime/__tests__/trend-analyst.test.ts`                          | Added angle validation, invented-content rejection, and legacy output coverage.                                   |
| `scripts/extensions/trend-finder/__tests__/collector.test.ts`                     | Added collector matching and fallback angle-pack coverage.                                                        |
| `src/extensions/trend-finder/__tests__/view-model.test.ts`                        | Added competitor chip and angle-pack projection coverage.                                                         |
| `src/extensions/trend-finder/components/__tests__/signal-workbench-view.test.tsx` | Added Creator Lens, Workbench, card, and Brief rendering coverage.                                                |
| `scripts/extensions/trend-finder/__tests__/static-brief-export.test.ts`           | Added static projection and privacy-safe angle-pack tests.                                                        |
| `scripts/extensions/trend-finder/__tests__/static-brief-renderer.test.ts`         | Added static HTML rendering tests for copy-ready blocks and chips.                                                |
| `src/lib/__tests__/trend-finder-dashboard.test.tsx`                               | Expanded dashboard coverage for Session 09 surfaces.                                                              |

***

## Technical Decisions

1. **Shared competitor normalization**: Browser draft storage, saved config validation, and collector matching use one bounded normalizer so caps, dedupe, display order, and match keys cannot drift.
2. **Evidence-level matching only**: Competitor flags attach to reviewed YouTube public channel-title evidence and do not create author identity grouping or any new source collection path.
3. **Additive browser contracts**: Lens competitors, evidence metadata, and angle-pack topic fields use schema defaults so legacy payloads and saved configs keep parsing.
4. **Deterministic angle fallback**: Missing or invalid analyst output falls back to topic names, lens context, and cited evidence without inventing sources, dates, URLs, or metrics.
5. **Projection before static rendering**: Static Brief rows receive only sanitized projected fields, and the renderer escapes generated copy and chip labels.

***

## Test Results

| Metric             | Value         |
| ------------------ | ------------- |
| Full Test Files    | 279 passed    |
| Full Tests         | 3437 passed   |
| Focused Test Files | 10 passed     |
| Focused Tests      | 133 passed    |
| Coverage           | Not collected |

Commands recorded in validation:

* `bun run typecheck:scripts` - PASS
* `bun run typecheck` - PASS
* `bun run test` - PASS, 279 files and 3437 tests
* Focused `bunx vitest run` suite - PASS, 10 files and 133 tests

***

## Lessons Learned

1. Creator Lens write paths need the same normalization and cap behavior on browser drafts, saved config, and bridge payloads to keep local state and runtime state aligned.
2. Competitor matching is safest as source-local evidence metadata, not as a cross-source identity layer.
3. Angle-pack copy should be validated and fallback-backed before browser rendering so cards, Brief, Workbench, and static export can stay simple.

***

## Future Considerations

Items for future sessions:

1. Session 10 demand centers should keep inferred or estimated values clearly labeled and bounded before browser projection.
2. Session 11 can reuse the analyst prompt-extension and deterministic fallback patterns introduced here for theme rollups and outlier ideas.
3. Any future competitor matching beyond public YouTube channel-title metadata requires a new source compliance review first.

***

## Session Statistics

* **Tasks**: 24 completed
* **Files Created**: 8
* **Files Modified**: 33
* **Tests Added**: 1 new script test file plus expanded bridge, config, analyst, collector, static Brief, view-model, and component coverage
* **Blockers**: 0 resolved


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