> 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/phase28-session02-signal-quality-score-and-collection-health/implementation-notes.md).

# Implementation Notes

**Session ID**: `phase28-session02-signal-quality-score-and-collection-health` **Started**: 2026-06-14 01:07 **Last Updated**: 2026-06-14 02:48

***

## Session Progress

| Metric              | Value   |
| ------------------- | ------- |
| Tasks Completed     | 24 / 24 |
| Estimated Remaining | 0 hours |
| Blockers            | 0       |

***

### Task T024 - Run focused gates and encoding checks

**Started**: 2026-06-14 02:43 **Completed**: 2026-06-14 02:48 **Duration**: 5 minutes

**Notes**:

* Focused Vitest suites passed: 5 test files, 94 tests.
* `bun run typecheck:scripts` passed.
* `bun run typecheck` passed.
* ASCII validation found no non-ASCII characters in touched code and session artifacts.
* LF validation found no CRLF line endings in touched code and session artifacts.
* `git diff --check` passed.

**Files Changed**:

* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/tasks.md` - marked T024 and completion checklist complete.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/implementation-notes.md` - logged final gate results.

**BQC Fixes**:

* Contract alignment: typechecks were run for both script and app contracts after cross-boundary changes.

***

### Task T023 - Add Engine Replay source rail component test

**Started**: 2026-06-14 02:40 **Completed**: 2026-06-14 02:43 **Duration**: 3 minutes

**Notes**:

* Added component test for source coverage, duplicate pressure, and quality counters.
* Asserted sensitive internal strings do not render in the source rail.
* Focused suite passed: `vitest run src/extensions/trend-finder/components/__tests__/engine-source-rail.test.tsx`.

**Files Changed**:

* `src/extensions/trend-finder/components/__tests__/engine-source-rail.test.tsx` - added Engine Replay source rail collection-health coverage.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/tasks.md` - marked T023 complete and updated progress summary.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/implementation-notes.md` - logged component test coverage.

**BQC Fixes**:

* Accessibility and platform compliance: test asserts the source collection counters are exposed through a labelled region.
* Error information boundaries: test asserts raw identity internals and private paths are absent.

***

### Task T022 - Add schema and view-model tests

**Started**: 2026-06-14 02:37 **Completed**: 2026-06-14 02:40 **Duration**: 3 minutes

**Notes**:

* Added legacy payload parsing coverage for missing collection-health and evidence-quality fields.
* Added view-model label coverage for unavailable and warning collection-health states.
* Added evidence quality label coverage.
* Focused suite passed: `vitest run src/extensions/trend-finder/__tests__/view-model.test.ts`.

**Files Changed**:

* `src/extensions/trend-finder/__tests__/view-model.test.ts` - added collection-health and quality label tests.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/tasks.md` - marked T022 complete and updated progress summary.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/implementation-notes.md` - logged schema/view-model test coverage.

**BQC Fixes**:

* State freshness on re-entry: tests lock unavailable defaults for legacy payloads.
* Contract alignment: tests lock user-facing quality, coverage, and duplicate-rate labels.

***

### Task T021 - Add scoring quality-selection tests

**Started**: 2026-06-14 02:34 **Completed**: 2026-06-14 02:37 **Duration**: 3 minutes

**Notes**:

* Added scoring coverage proving quality-selected syndicated evidence changes evidence strength.
* Asserted six-factor opportunity score weights remain unchanged.
* Asserted syndication grouping still counts one shared story once.
* Focused suite passed: `vitest run scripts/lib/ai-runtime/__tests__/scoring.test.ts`.

**Files Changed**:

* `scripts/lib/ai-runtime/__tests__/scoring.test.ts` - added quality-selected evidence-strength coverage.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/tasks.md` - marked T021 complete and updated progress summary.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/implementation-notes.md` - logged scoring test coverage.

**BQC Fixes**:

* Contract alignment: tests lock the score-weight contract while validating the new evidence-strength input behavior.

***

### Task T020 - Add collector quality and collection-health tests

**Started**: 2026-06-14 02:26 **Completed**: 2026-06-14 02:34 **Duration**: 8 minutes

**Notes**:

* Extended collector dedup coverage to assert quality propagation to analyst/browser evidence.
* Asserted run-level collection health, high-duplicate warning state, duplicate counters, source coverage, and sanitized Engine Trace counters.
* Added degraded coverage test for a run where only one of the configured source set produced evidence.
* Focused suite passed: `vitest run scripts/extensions/trend-finder/__tests__/collector.test.ts`.

**Files Changed**:

* `scripts/extensions/trend-finder/__tests__/collector.test.ts` - added quality propagation and collection-health assertions.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/tasks.md` - marked T020 complete and updated progress summary.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/implementation-notes.md` - logged collector test coverage.

**BQC Fixes**:

* Contract alignment: tests cover collector payload, analyst input, and Engine Trace collection-health contracts together.
* Error information boundaries: tests keep browser output free of normalized URL and content hash internals.

***

### Task T019 - Map collection health into sanitized Engine Trace

**Started**: 2026-06-14 02:20 **Completed**: 2026-06-14 02:26 **Duration**: 6 minutes

**Notes**:

* Added collection-health mapping from sanitized source collection trace records.
* Added a unit-ratio clamp for duplicate rate and rejected unsafe trace values before copying counters.
* Added `evidence-quality.applied` to the Trend Finder trace event allowlist.

**Files Changed**:

* `scripts/extensions/trend-finder/engine-trace.ts` - mapped collection-health counters into sanitized Engine Trace output.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/tasks.md` - marked T019 complete and updated progress summary.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/implementation-notes.md` - logged trace mapping implementation.

**BQC Fixes**:

* Trust boundary enforcement: trace mapping rejects unsafe values and copies only bounded scalar counters.
* Error information boundaries: no private paths, raw URLs, or source payload data are emitted through collection-health trace fields.

***

### Task T018 - Render Signal Workbench quality controls

**Started**: 2026-06-14 02:12 **Completed**: 2026-06-14 02:20 **Duration**: 8 minutes

**Notes**:

* Added Quality as a sortable Workbench table column.
* Added compact quality pills to expanded evidence rows with aria labels.
* Updated fixed table width, colgroup, and detail colspans to keep the table layout stable.

**Files Changed**:

* `src/extensions/trend-finder/components/signal-workbench-table.tsx` - rendered quality column, sort affordance, and evidence quality pills.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/tasks.md` - marked T018 complete and updated progress summary.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/implementation-notes.md` - logged Workbench table implementation.

**BQC Fixes**:

* Accessibility and platform compliance: quality column uses existing `aria-sort` behavior and evidence pills expose quality aria labels.
* Layout stability: fixed table width, colgroup, and colspans were updated with the new column.

***

### Task T017 - Add Signal Workbench quality values and sort key

**Started**: 2026-06-14 02:05 **Completed**: 2026-06-14 02:12 **Duration**: 7 minutes

**Notes**:

* Added evidence-row quality score, label, tone, aria label, and sort value.
* Added topic-row average evidence quality score, label, tone, and stable sort value.
* Added `qualityScore` to the Signal Workbench sort-key contract.

**Files Changed**:

* `src/extensions/trend-finder/signal-workbench-model.ts` - added quality row fields, average topic quality, search text, and sort key support.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/tasks.md` - marked T017 complete and updated progress summary.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/implementation-notes.md` - logged Workbench model implementation.

**BQC Fixes**:

* Contract alignment: unavailable quality rows use a stable `-1` sort value instead of `NaN` or undefined.

***

### Task T016 - Render Engine Replay source health and quality counters

**Started**: 2026-06-14 01:58 **Completed**: 2026-06-14 02:05 **Duration**: 7 minutes

**Notes**:

* Added Engine Replay source rail aggregate metrics for source coverage, duplicate pressure, average evidence quality, and collection state.
* Metrics prefer sanitized trace counters and fall back to parsed payload data.
* Rendered counters in the source rail as compact labelled metric cells.

**Files Changed**:

* `src/extensions/trend-finder/engine-replay-model.ts` - added source rail collection-health and quality metrics.
* `src/extensions/trend-finder/components/engine-source-rail.tsx` - rendered sanitized source collection counters.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/tasks.md` - marked T016 complete and updated progress summary.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/implementation-notes.md` - logged Engine Replay rendering.

**BQC Fixes**:

* Error information boundaries: Engine Replay uses sanitized aggregate counters only.
* Accessibility and platform compliance: counters render in a labelled definition list.

***

### Task T015 - Render Sources collection-health rollups

**Started**: 2026-06-14 01:53 **Completed**: 2026-06-14 01:58 **Duration**: 5 minutes

**Notes**:

* Added collection-health state and source coverage to the Sources header.
* Added compact health tiles for N-of-M source coverage and duplicate pressure.
* Reused the existing tile grid and tone classes to keep the view dense and operational.

**Files Changed**:

* `src/extensions/trend-finder/views/sources-view.tsx` - rendered collection-health header and tiles.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/tasks.md` - marked T015 complete and updated progress summary.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/implementation-notes.md` - logged Sources view implementation.

**BQC Fixes**:

* Accessibility and platform compliance: collection health is included in the existing source-health labelled section.
* State freshness on re-entry: the view uses parsed run-level collection-health state, not ad hoc source inference.

***

### Task T014 - Persist additive quality and collection-health payload fields

**Started**: 2026-06-14 01:52 **Completed**: 2026-06-14 01:53 **Duration**: 1 minute

**Notes**:

* Confirmed schema defaults parse legacy evidence quality and collection-health fields.
* Confirmed collector-generated payload output now includes `collectionHealth`.
* Evidence quality fields are parsed as bounded additive payload fields.

**Files Changed**:

* `src/extensions/trend-finder/schema.ts` - additive payload schemas and defaults.
* `scripts/extensions/trend-finder/collector.ts` - generated payload includes collection health and evidence quality.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/tasks.md` - marked T014 complete and updated progress summary.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/implementation-notes.md` - logged persistence confirmation.

**BQC Fixes**:

* Contract alignment: generated and parsed payload contracts now agree for additive fields.

***

### Task T013 - Feed quality into evidence-strength scoring

**Started**: 2026-06-14 01:50 **Completed**: 2026-06-14 01:52 **Duration**: 2 minutes

**Notes**:

* Evidence strength now averages shared quality scores and keeps relevance as a separate bounded component.
* The six-factor `OPPORTUNITY_SCORE_WEIGHTS` contract was not changed.
* Quality selection still runs before syndication grouping in the existing scoring context.

**Files Changed**:

* `scripts/lib/ai-runtime/scoring.ts` - added quality input to evidence-strength calculation.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/tasks.md` - marked T013 complete and updated progress summary.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/implementation-notes.md` - logged scoring implementation.

**BQC Fixes**:

* Contract alignment: relevance remains a bounded component while shared quality becomes the cross-source input.

***

### Task T012 - Use shared quality for evidence selection

**Started**: 2026-06-14 01:49 **Completed**: 2026-06-14 01:50 **Duration**: 1 minute

**Notes**:

* Confirmed `selectEvidenceForScoring()` now uses shared quality score before relevance.
* Low-quality per-source caps remain in place.
* Scoring still applies syndication grouping after quality-based source selection.
* Behavior is covered by the new source-quality tests.

**Files Changed**:

* `scripts/extensions/trend-finder/sources/source-quality.ts` - quality-first ordering path.
* `scripts/extensions/trend-finder/sources/__tests__/source-quality.test.ts` - quality selection and low-quality cap coverage.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/tasks.md` - marked T012 complete and updated progress summary.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/implementation-notes.md` - logged selection behavior.

**BQC Fixes**:

* Contract alignment: legacy relevance fallback remains bounded when quality score is missing.

***

### Task T011 - Build collection-health rollups

**Started**: 2026-06-14 01:43 **Completed**: 2026-06-14 01:49 **Duration**: 6 minutes

**Notes**:

* Added a deterministic collection-health rollup from accepted evidence, source summaries, and Session 01 duplicate summary.
* Derived duplicate pressure, high-duplicate source count, source coverage, coverage rate, labels, and state.
* Added collection-health output to source trace input and final Trend Finder payload.

**Files Changed**:

* `scripts/extensions/trend-finder/collector.ts` - added collection-health rollup helper and final payload wiring.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/tasks.md` - marked T011 complete and updated progress summary.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/implementation-notes.md` - logged collection-health rollup implementation.

**BQC Fixes**:

* Contract alignment: rollups use bounded scalar fields matching the browser schema.
* State freshness on re-entry: empty, offline, degraded, warning, and healthy states derive from each current run instead of UI inference.

***

### Task T010 - Apply quality scores in the collector

**Started**: 2026-06-14 01:35 **Completed**: 2026-06-14 01:43 **Duration**: 8 minutes

**Notes**:

* Added a collector quality pass after Session 01 identity metadata is applied.
* Browser and analyst evidence now receive the same bounded quality score by evidence ID.
* Added explicit warning mapping for analyst/browser schema validation issues and unmatched browser rows.
* Preserved quality score through analyst evidence cache summaries.

**Files Changed**:

* `scripts/extensions/trend-finder/collector.ts` - added quality pass, trace event, warning mapping, and cache quality fields.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/tasks.md` - marked T010 complete and updated progress summary.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/implementation-notes.md` - logged collector quality propagation.

**BQC Fixes**:

* Contract alignment: browser and analyst evidence are matched by retained evidence ID after deduplication.
* Failure path completeness: validation problems produce explicit warnings and bounded fallbacks instead of silent missing quality data.
* Error information boundaries: warning details include schema paths and codes only, not raw URLs or source payloads.

***

### Task T009 - Add Engine Replay collection-health trace defaults

**Started**: 2026-06-14 01:31 **Completed**: 2026-06-14 01:35 **Duration**: 4 minutes

**Notes**:

* Added sanitized Engine Trace collection-health states, counters, defaults, and parser mapping.
* Kept trace payload numeric and bounded; UI labels are derived later through view models.
* Legacy traces default to unavailable collection-health counters.

**Files Changed**:

* `src/extensions/trend-finder/engine-trace.ts` - added collection-health trace contract and parser defaults.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/tasks.md` - marked T009 complete and updated progress summary.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/implementation-notes.md` - logged trace contract implementation.

**BQC Fixes**:

* Trust boundary enforcement: trace parsing accepts only bounded scalar counters and known states.
* Error information boundaries: no raw source payloads, URLs, private paths, or unbounded arrays were added to Engine Trace.

***

### Task T008 - Add collection-health and quality view-model labels

**Started**: 2026-06-14 01:25 **Completed**: 2026-06-14 01:31 **Duration**: 6 minutes

**Notes**:

* Added shared collection-health state labels, tones, details, and aria labels.
* Added shared evidence quality label and tone helpers.
* Extended evidence link view models with quality labels while keeping unavailable fallback behavior.

**Files Changed**:

* `src/extensions/trend-finder/view-model.ts` - added collection-health and quality view models plus evidence link quality fields.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/tasks.md` - marked T008 complete and updated progress summary.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/implementation-notes.md` - logged view-model implementation.

**BQC Fixes**:

* Accessibility and platform compliance: quality and collection-health labels include stable aria text for downstream components.
* State freshness on re-entry: missing collection-health and quality data render unavailable states instead of stale inferred labels.

***

### Task T007 - Extend analyst evidence quality contracts

**Started**: 2026-06-14 01:22 **Completed**: 2026-06-14 01:25 **Duration**: 3 minutes

**Notes**:

* Added optional `qualityScore` and `qualityComponents` to script-side analyst evidence.
* Added bounded quality component parsing with safe defaults and optional score fallback behavior.
* Included quality metadata in analyst request serialization and sanitized request summaries.

**Files Changed**:

* `scripts/lib/ai-runtime/trend-analyst.ts` - extended evidence interfaces, schemas, and serialization paths.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/tasks.md` - marked T007 complete and updated progress summary.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/implementation-notes.md` - logged analyst contract implementation.

**BQC Fixes**:

* Contract alignment: optional metadata is accepted by the script contract and omitted safely from JSON when absent.
* Failure path completeness: invalid quality component payloads fall back to bounded defaults instead of rejecting evidence.

***

### Task T006 - Add evidence quality and collection-health schema defaults

**Started**: 2026-06-14 01:18 **Completed**: 2026-06-14 01:22 **Duration**: 4 minutes

**Notes**:

* Added additive collection-health states and default unavailable payload.
* Added bounded evidence `qualityScore` and optional component fields with defaulted legacy parsing.
* Kept exported `TrendFinderData` and `TrendEvidenceItem` fixture-friendly by allowing additive fields to be omitted in hand-built objects.

**Files Changed**:

* `src/extensions/trend-finder/schema.ts` - added collection-health schema, evidence quality schemas, parser defaults, and empty data defaults.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/tasks.md` - marked T006 complete and updated progress summary.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/implementation-notes.md` - logged schema implementation.

**BQC Fixes**:

* State freshness on re-entry: legacy payloads parse to an explicit unavailable collection-health state instead of stale inferred values.
* Contract alignment: evidence quality and collection-health fields are bounded and additive.

***

### Task T005 - Add source-quality helper tests

**Started**: 2026-06-14 01:16 **Completed**: 2026-06-14 01:18 **Duration**: 2 minutes

**Notes**:

* Added tests for quality component scoring, missing/malformed fallback fields, quality-first ordering, legacy relevance fallback, deterministic tie-breakers, and low-quality caps.
* Focused suite passed: `vitest run scripts/extensions/trend-finder/sources/__tests__/source-quality.test.ts`.

**Files Changed**:

* `scripts/extensions/trend-finder/sources/__tests__/source-quality.test.ts` - added focused source-quality coverage.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/tasks.md` - marked T005 complete and updated progress summary.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/implementation-notes.md` - logged test implementation.

**BQC Fixes**:

* Contract alignment: tests enforce legacy relevance fallback when quality metadata is absent.
* Failure path completeness: tests enforce bounded malformed URL and timestamp fallbacks.

***

### Task T004 - Extend evidence quality score helper and ordering

**Started**: 2026-06-14 01:10 **Completed**: 2026-06-14 01:16 **Duration**: 6 minutes

**Notes**:

* Added quality component weights for source tier, source-local signal, recency, relevance, title sanity, and URL presence.
* Added deterministic bounded component helpers and `calculateEvidenceQualityScore()`.
* Updated evidence ordering to prefer stored shared quality score, then relevance, timestamp, source ID, and evidence ID.
* Kept legacy fallback ordering stable by using bounded relevance when quality metadata is not present.

**Files Changed**:

* `scripts/extensions/trend-finder/sources/source-quality.ts` - added quality score contracts, clamps, component math, and quality-first ordering.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/tasks.md` - marked T004 complete and updated progress summary.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/implementation-notes.md` - logged helper implementation.

**BQC Fixes**:

* Contract alignment: legacy evidence without quality metadata keeps deterministic relevance fallback ordering.
* Failure path completeness: malformed timestamps and URLs fall back to bounded component scores without throwing.

***

### Task T003 - Inspect Trend Finder quality, collector, scoring, schema, and UI baselines

**Started**: 2026-06-14 01:09 **Completed**: 2026-06-14 01:10 **Duration**: 1 minute

**Notes**:

* Reviewed `source-quality.ts`; source tiers and low-quality caps exist, but ordering uses `relevanceScore` only.
* Reviewed collector evidence preparation, Session 01 identity wiring, sanitized duplicate trace payloads, and final payload assembly.
* Reviewed scoring evidence-strength math; relevance currently drives 45% of evidence strength and quality selection runs before syndication grouping.
* Reviewed browser schema, Sources view, Engine Replay trace/model/component, and Signal Workbench evidence rows for additive fields and UI insertion points.

**Files Changed**:

* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/tasks.md` - marked T003 complete and updated progress summary.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/implementation-notes.md` - logged baseline inspection.

**BQC Fixes**:

* None.

***

### Task T002 - Verify Trends-Finderz quality and scan-health references

**Started**: 2026-06-14 01:08 **Completed**: 2026-06-14 01:09 **Duration**: 1 minute

**Notes**:

* Reviewed `EXAMPLES/trends-finderz/lib/signals/signal-fingerprint.ts`; quality meta is deterministic and bounded from source trust, recency, engagement, title sanity, and URL presence.
* Reviewed `EXAMPLES/trends-finderz/lib/product/source-quality.ts`; source quality summaries use clamped scores, source contribution counts, and scalar warnings.
* Reviewed `EXAMPLES/trends-finderz/lib/scan/scan-reliability-qa.ts`; scan health uses duplicate-rate and source-coverage labels with pass/review/fail states.
* No code changes were required for this verification task.

**Files Changed**:

* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/tasks.md` - marked T002 complete and updated progress summary.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/implementation-notes.md` - logged reference verification.

**BQC Fixes**:

* None.

***

### Task T001 - Verify Session 01 dedup and syndication outputs

**Started**: 2026-06-14 01:07 **Completed**: 2026-06-14 01:08 **Duration**: 1 minute

**Notes**:

* Confirmed Session 01 validation result is PASS with 23/23 tasks complete.
* Confirmed duplicate, high-duplicate, syndication, trace sanitization, ASCII, LF, typecheck, lint, and full test gates passed in the prior session.
* No code changes were required for this verification task.

**Files Changed**:

* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/tasks.md` - marked T001 complete and updated progress summary.
* `.spec_system/specs/phase28-session02-signal-quality-score-and-collection-health/implementation-notes.md` - logged setup verification.

**BQC Fixes**:

* None.

***

## Task Log

### 2026-06-14 - Session Start

**Environment verified**:

* [x] Prerequisites confirmed
* [x] Tools available via project-local `node_modules/.bin`
* [x] Directory structure ready

***


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