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# Implementation Summary

**Session ID**: `phase29-session10-seed-candidate-review-artifact` **Completed**: 2026-06-21 **Duration**: 0.6 hours

***

## Overview

Completed the private Trend Finder seed-candidate review artifact. The session adds deterministic candidate derivation over existing reviewed evidence and weak identity context, writes candidate rows only to private diagnostics storage, and exposes only safe manifest metadata to browser payloads and payload-size reporting.

***

## Deliverables

### Files Created

| File                                                                | Purpose                                                                                                                                           | Lines |
| ------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------- | ----- |
| `scripts/extensions/trend-finder/seed-candidates.ts`                | Private seed-candidate derivation, bounds, collision checks, deterministic ordering, and row projection.                                          | 603   |
| `scripts/extensions/trend-finder/__tests__/seed-candidates.test.ts` | Unit coverage for unknown IDs, weak identity, unclustered evidence, source-local outliers, collisions, ordering, row bounds, and no-signal cases. | 260   |

### Files Modified

| File                                                                    | Changes                                                                                                                     |
| ----------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------- |
| `scripts/extensions/trend-finder/collector.ts`                          | Runs candidate generation after identity context exists and before private diagnostics handoff, with safe failure metadata. |
| `scripts/extensions/trend-finder/private-diagnostics.ts`                | Writes the private seed-candidates artifact and keeps browser-safe manifest metadata row-free and path-free.                |
| `src/extensions/trend-finder/schema.ts`                                 | Adds defaulted private diagnostics artifact schema support for seed candidates.                                             |
| `scripts/lib/ai-runtime/topic-identity.ts`                              | Exposes weak identity signals without changing resolver behavior.                                                           |
| `scripts/lib/ai-runtime/canonical-topic-seeds.ts`                       | Adds read-only normalized canonical lookup helpers for collision checks.                                                    |
| `scripts/extensions/trend-finder/topics.ts`                             | Projects final topic, evidence, and identity context for private candidate generation.                                      |
| `scripts/extensions/trend-finder/normalize.ts`                          | Preserves reviewed evidence attributes needed by candidate scoring.                                                         |
| `scripts/extensions/trend-finder/sources/keyword-packs.ts`              | Adds read-only reviewed keyword lookup helpers.                                                                             |
| `scripts/extensions/trend-finder/measure-payload-size.ts`               | Accounts for safe manifest metadata while keeping candidate rows private.                                                   |
| `scripts/extensions/trend-finder/__tests__/private-diagnostics.test.ts` | Covers private artifact writing, skipped/error states, manifest safety, and path omission.                                  |
| `scripts/extensions/trend-finder/__tests__/collector.test.ts`           | Covers collector integration, manifest-only browser exposure, and no seed/keyword mutation.                                 |
| `scripts/lib/ai-runtime/__tests__/topic-identity.test.ts`               | Covers weak identity helper behavior.                                                                                       |
| `scripts/extensions/trend-finder/__tests__/normalize.test.ts`           | Covers preservation of seed-candidate evidence attributes.                                                                  |

***

## Technical Decisions

1. **Private-only review rows**: Candidate rows are written through private diagnostics storage and never enter browser payloads, static Brief output, logs, keyword packs, or canonical seed files.
2. **Manual-review gate**: Every generated row carries `manual_review_required: true`; repeated weak evidence can create review material but cannot approve or mutate seeds.
3. **Read-only collision checks**: Candidate proposals compare against reviewed canonical seeds and reviewed keyword packs through normalized lookup helpers without enabling write paths.
4. **Deterministic bounded output**: Candidate rows are sorted and capped by stable reason priority, support, confidence, label, and ID so runs remain reproducible and payload-safe.

***

## Test Results

| Metric   | Value   |
| -------- | ------- |
| Tests    | 3808    |
| Passed   | 3808    |
| Coverage | Not run |

Validation also passed lint, app typecheck, script typecheck, payload-size reporting at 14,138 bytes, private runtime artifact scan, targeted Prettier checks, and ASCII/CRLF validation.

***

## Lessons Learned

1. Private review workflows need a manifest-only browser contract from the start, not after row generation is wired.
2. Collision helpers belong behind read-only lookup APIs so future review tooling can reuse them without inheriting mutation authority.
3. Weak identity signals are most useful when exported as explicit context instead of altering resolver behavior.

***

## Future Considerations

Items for future sessions:

1. Build an explicit operator approval or import workflow only after a separate session defines the mutation boundary.
2. Reuse the private artifact manifest pattern for later private diagnostics that must not leak rows or file paths.
3. Continue checking payload size and private artifact scans as Phase 29 adds denser operator surfaces.

***

## Session Statistics

* **Tasks**: 20 completed
* **Files Created**: 2 source/test files plus session workflow artifacts
* **Files Modified**: 13 source/test files plus tracking metadata
* **Tests Added**: 5 focused test areas
* **Blockers**: 0 resolved


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