> 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-session01-cross-source-signal-identity-and-dedup/implementation-notes.md).

# Implementation Notes

**Session ID**: `phase28-session01-cross-source-signal-identity-and-dedup` **Started**: 2026-06-14 00:18 **Last Updated**: 2026-06-14 00:43

***

## Session Progress

| Metric              | Value   |
| ------------------- | ------- |
| Tasks Completed     | 23 / 23 |
| Estimated Remaining | 0 hours |
| Blockers            | 0       |

***

### Task T023 - Validate ASCII and record manual verification

**Started**: 2026-06-14 00:39 **Completed**: 2026-06-14 00:43 **Duration**: 4 minutes

**Notes**:

* Formatted touched implementation and test files with Prettier.
* Verified focused fixture replay through collector tests: same-source duplicate dropped, cross-source sibling retained, browser output stayed count-only, and engine trace counters were aggregate-only.
* Verified ASCII-only content and Unix line endings for touched code/test files and session artifacts.

**Files Changed**:

* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/tasks.md` - Marked T023 and completion checklist complete.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/implementation-notes.md` - Recorded final verification and completion state.

**BQC Fixes**:

* Error information boundaries: final fixture replay and trace tests verify no raw normalized URLs or hash-like identity values leave script-only metadata.

**Verification**:

* `bunx prettier --write scripts/extensions/trend-finder/sources/signal-identity.ts scripts/extensions/trend-finder/sources/__tests__/signal-identity.test.ts scripts/extensions/trend-finder/collector.ts scripts/extensions/trend-finder/__tests__/collector.test.ts scripts/extensions/trend-finder/engine-trace.ts scripts/extensions/trend-finder/__tests__/engine-trace.test.ts scripts/lib/ai-runtime/trend-analyst.ts scripts/lib/ai-runtime/scoring.ts scripts/lib/ai-runtime/__tests__/scoring.test.ts src/extensions/trend-finder/schema.ts src/extensions/trend-finder/engine-trace.ts` - completed.
* `bunx vitest run scripts/extensions/trend-finder/sources/__tests__/signal-identity.test.ts scripts/extensions/trend-finder/__tests__/collector.test.ts scripts/lib/ai-runtime/__tests__/scoring.test.ts src/extensions/trend-finder/__tests__/view-model.test.ts scripts/extensions/trend-finder/__tests__/engine-trace.test.ts` - passed (5 files, 98 tests).
* `bun run typecheck:scripts` - passed.
* `bun run typecheck` - passed.
* `rg -nP '[^\\x00-\\x7F]' [touched files and session artifacts]` - no matches.
* `rg -n $'\\r' [touched files and session artifacts]` - no matches.
* `git diff --check` - passed.

***

### Task T022 - Run focused Vitest suites

**Started**: 2026-06-14 00:39 **Completed**: 2026-06-14 00:39 **Duration**: 1 minute

**Notes**:

* Ran the focused identity, collector, scoring, schema/view-model, and engine trace suites together.

**Files Changed**:

* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/tasks.md` - Marked T022 complete and updated progress.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/implementation-notes.md` - Logged focused verification.

**BQC Fixes**:

* N/A - verification task.

**Verification**:

* `bunx vitest run scripts/extensions/trend-finder/sources/__tests__/signal-identity.test.ts scripts/extensions/trend-finder/__tests__/collector.test.ts scripts/lib/ai-runtime/__tests__/scoring.test.ts src/extensions/trend-finder/__tests__/view-model.test.ts scripts/extensions/trend-finder/__tests__/engine-trace.test.ts` - passed (5 files, 98 tests).

***

### Task T021 - Add engine trace counter tests

**Started**: 2026-06-14 00:38 **Completed**: 2026-06-14 00:39 **Duration**: 1 minute

**Notes**:

* Added engine trace coverage for duplicate counters, high duplicate source counters, syndicated group counters, and max syndicated source count.
* Added leak checks proving raw-looking identity details in trace input do not survive in replay output.

**Files Changed**:

* `scripts/extensions/trend-finder/__tests__/engine-trace.test.ts` - Added sanitized identity counter test.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/tasks.md` - Marked T021 complete and updated progress.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/implementation-notes.md` - Logged trace test.

**BQC Fixes**:

* Error information boundaries: trace test verifies raw URL/hash-like fields from identity summaries are not emitted in replay output.

**Verification**:

* `bunx vitest run scripts/extensions/trend-finder/__tests__/engine-trace.test.ts` - passed (9 tests).

***

### Task T020 - Add syndicated scoring regression tests

**Started**: 2026-06-14 00:36 **Completed**: 2026-06-14 00:38 **Duration**: 2 minutes

**Notes**:

* Added a scoring regression comparing one independent story with the same story syndicated across three sources.
* Verified momentum, evidence strength, and source-diversity score dimensions do not inflate.
* Verified topic output still preserves all evidence IDs, full evidence/source counts, and topic syndication counters.

**Files Changed**:

* `scripts/lib/ai-runtime/__tests__/scoring.test.ts` - Added syndicated scoring projection test.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/tasks.md` - Marked T020 complete and updated progress.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/implementation-notes.md` - Logged scoring test.

**BQC Fixes**:

* Contract alignment: regression test proves grouped scoring and full display evidence contracts stay distinct.

**Verification**:

* `bunx vitest run scripts/lib/ai-runtime/__tests__/scoring.test.ts` - passed (30 tests).

***

### Task T019 - Add collector identity integration tests

**Started**: 2026-06-14 00:34 **Completed**: 2026-06-14 00:36 **Duration**: 2 minutes

**Notes**:

* Added collector coverage for same-source dedup, synchronized analyst/browser filtering, high duplicate-rate warnings, syndication counts, and browser-safe output.
* Verified engine trace evidence counters are populated from sanitized identity summaries.
* Fixed a collector local variable collision found by the test run.

**Files Changed**:

* `scripts/extensions/trend-finder/__tests__/collector.test.ts` - Added identity/dedup/syndication collector test.
* `scripts/extensions/trend-finder/collector.ts` - Renamed local signal/topic identity result variables to avoid collision.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/tasks.md` - Marked T019 complete and updated progress.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/implementation-notes.md` - Logged collector test and fix.

**BQC Fixes**:

* Contract alignment: collector test verifies analyst input, browser evidence, and trace counters agree after dedup.
* Error information boundaries: collector test asserts browser evidence omits raw normalized URLs and content hashes.

**Verification**:

* `bunx vitest run scripts/extensions/trend-finder/__tests__/collector.test.ts` - passed (23 tests).

***

### Task T018 - Map collector identity events into replay counters

**Started**: 2026-06-14 00:34 **Completed**: 2026-06-14 00:34 **Duration**: 1 minute

**Notes**:

* Whitelisted `signal-identity.applied` and `signal-identity.high-duplicate-rate` trace events.
* Mapped sanitized duplicate and syndication summaries into replay evidence counters.
* Preserved `null` defaults when legacy traces do not contain identity summaries.

**Files Changed**:

* `scripts/extensions/trend-finder/engine-trace.ts` - Added event whitelist entries and evidence-count mapper logic.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/tasks.md` - Marked T018 complete and updated progress.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/implementation-notes.md` - Logged trace mapper changes.

**BQC Fixes**:

* Error information boundaries: mapper consumes sanitized aggregate summaries only and keeps raw identity artifacts out of replay output.

**Verification**:

* `bunx vitest run scripts/extensions/trend-finder/__tests__/engine-trace.test.ts` - passed (8 tests).

***

### Task T017 - Extend engine trace schema counters

**Started**: 2026-06-14 00:32 **Completed**: 2026-06-14 00:34 **Duration**: 2 minutes

**Notes**:

* Added nullable duplicate and syndication counters to `EngineTraceEvidenceCounts`.
* Added schema defaults for legacy traces without identity counters.
* Counter fields remain aggregate-only and do not include raw URLs, normalized URLs, hashes, or private paths.

**Files Changed**:

* `src/extensions/trend-finder/engine-trace.ts` - Added evidence-count fields and schema defaults.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/tasks.md` - Marked T017 complete and updated progress.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/implementation-notes.md` - Logged trace schema changes.

**BQC Fixes**:

* Contract alignment: legacy trace parsing defaults missing counters to nullable values.
* Error information boundaries: new trace schema fields are aggregate counts only.

**Verification**:

* `bunx vitest run scripts/extensions/trend-finder/__tests__/engine-trace.test.ts` - passed (8 tests).

***

### Task T016 - Preserve full evidence rows outside grouped scoring

**Started**: 2026-06-14 00:32 **Completed**: 2026-06-14 00:32 **Duration**: 1 minute

**Notes**:

* Topic `evidenceIds`, `evidenceCount`, displayed `sourceDiversity`, lifecycle input, and role shares continue to use full linked evidence rows.
* Existing source breakdown derivation remains based on browser evidence rows after same-source dedup, preserving legitimate per-source coverage.
* Only scoring-sensitive volume, velocity, hidden-gem, saturation, and diversity inputs use the grouped projection.

**Files Changed**:

* `scripts/lib/ai-runtime/scoring.ts` - Preserved full evidence context while adding grouped scoring fields.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/tasks.md` - Marked T016 complete and updated progress.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/implementation-notes.md` - Logged preservation boundaries.

**BQC Fixes**:

* Contract alignment: display/linkage contracts keep full evidence rows, while scoring receives the deduped projection.

**Verification**:

* `bunx vitest run scripts/lib/ai-runtime/__tests__/scoring.test.ts` - passed (29 tests).

***

### Task T015 - Build syndicated scoring projection

**Started**: 2026-06-14 00:30 **Completed**: 2026-06-14 00:32 **Duration**: 2 minutes

**Notes**:

* Added a grouped scoring projection after existing source-quality evidence selection.
* Syndicated groups now contribute one representative to evidence volume, velocity dynamics, hidden-gem checks, risk flags, saturation, and source-diversity scoring.
* Added topic-level syndication counters from full linked evidence.

**Files Changed**:

* `scripts/lib/ai-runtime/scoring.ts` - Added syndication grouping, scoring source counts, velocity projection, and topic count outputs.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/tasks.md` - Marked T015 complete and updated progress.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/implementation-notes.md` - Logged scoring projection work.

**BQC Fixes**:

* Contract alignment: scoring uses identity metadata only when available and falls back to per-evidence grouping for legacy evidence.

**Verification**:

* `bunx vitest run scripts/lib/ai-runtime/__tests__/scoring.test.ts` - passed (29 tests).

***

### Task T014 - Add bounded syndication count defaults to browser schema

**Started**: 2026-06-14 00:29 **Completed**: 2026-06-14 00:30 **Duration**: 1 minute

**Notes**:

* Added `syndicationCount` and `syndicationEvidenceCount` defaults to browser evidence rows.
* Added `syndicationCount` and `syndicatedEvidenceCount` defaults to topic payloads.
* Defaults preserve legacy payload parsing with missing fields.

**Files Changed**:

* `src/extensions/trend-finder/schema.ts` - Added bounded count-only syndication fields and defaults.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/tasks.md` - Marked T014 complete and updated progress.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/implementation-notes.md` - Logged schema defaults.

**BQC Fixes**:

* Contract alignment: browser payload parsing accepts legacy payloads and clamps new count fields with existing bounded count schema.

**Verification**:

* `bunx vitest run src/extensions/trend-finder/__tests__/view-model.test.ts` - passed (30 tests).

***

### Task T013 - Emit duplicate and syndication trace counters

**Started**: 2026-06-14 00:29 **Completed**: 2026-06-14 00:29 **Duration**: 1 minute

**Notes**:

* Added `signal-identity.applied` trace event with sanitized duplicate and syndication summaries.
* Added `signal-identity.high-duplicate-rate` warning trace event when duplicate rates exceed the helper threshold.
* Added high duplicate-rate collector warnings with source-scoped counts and no raw URL/hash values.

**Files Changed**:

* `scripts/extensions/trend-finder/collector.ts` - Added trace emission and high-rate warning mapping.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/tasks.md` - Marked T013 complete and updated progress.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/implementation-notes.md` - Logged trace and warning work.

**BQC Fixes**:

* Error information boundaries: trace payloads include aggregate counts only and omit normalized URLs, hashes, and raw evidence payloads.
* Failure path completeness: high duplicate-rate conditions are visible through warnings and trace events.

***

### Task T012 - Drop same-source duplicate browser and analyst evidence in sync

**Started**: 2026-06-14 00:29 **Completed**: 2026-06-14 00:29 **Duration**: 1 minute

**Notes**:

* Browser evidence and analyst evidence are now filtered from the same duplicate-id set produced by `applySignalIdentity()`.
* Dedup state is scoped to the current collect pass, preventing repeated rows without retaining mutable state across runs.

**Files Changed**:

* `scripts/extensions/trend-finder/collector.ts` - Assigned deduped browser and analyst arrays together from one identity result.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/tasks.md` - Marked T012 complete and updated progress.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/implementation-notes.md` - Logged synchronized dedup behavior.

**BQC Fixes**:

* Duplicate action prevention: same-source repeats are dropped before analyst input and browser payload assembly.
* State freshness on re-entry: dedup sets are created inside each collection run.

***

### Task T011 - Wire identity metadata into collector evidence

**Started**: 2026-06-14 00:27 **Completed**: 2026-06-14 00:29 **Duration**: 2 minutes

**Notes**:

* Applied signal identity immediately after source collection returns source-local-enriched evidence.
* Preserved script-only analyst identity metadata and count-only browser syndication metadata.
* Added explicit duplicate warning mapping from the helper summary into collector warnings.

**Files Changed**:

* `scripts/extensions/trend-finder/collector.ts` - Wired `applySignalIdentity()` into the collection path and added warning/sanitization helpers.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/tasks.md` - Marked T011 complete and updated progress.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/implementation-notes.md` - Logged collector identity wiring.

**BQC Fixes**:

* Contract alignment: collector now keeps script-only identity metadata off browser evidence and maps only bounded counts to browser rows.
* Failure path completeness: duplicate conditions produce visible warnings rather than silent drops.

***

### Task T010 - Implement cross-source syndication grouping

**Started**: 2026-06-14 00:26 **Completed**: 2026-06-14 00:26 **Duration**: 1 minute

**Notes**:

* Implemented content-hash syndication groups with source sibling counts, evidence counts, and bounded group summaries.
* Browser evidence receives only bounded `syndicationCount` and `syndicationEvidenceCount` fields.
* Script-side analyst evidence receives identity and syndication metadata for scoring projection.

**Files Changed**:

* `scripts/extensions/trend-finder/sources/signal-identity.ts` - Added syndication grouping and browser-safe count outputs.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/tasks.md` - Marked T010 complete and updated progress.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/implementation-notes.md` - Logged syndication implementation.

**BQC Fixes**:

* Error information boundaries: helper tests verify browser evidence does not contain raw normalized URL or hash fields.
* Contract alignment: each retained row receives deterministic count metadata for downstream schema and scoring consumers.

**Verification**:

* `bunx vitest run scripts/extensions/trend-finder/sources/__tests__/signal-identity.test.ts` - passed (6 tests).

***

### Task T009 - Implement within-source duplicate detection

**Started**: 2026-06-14 00:26 **Completed**: 2026-06-14 00:26 **Duration**: 1 minute

**Notes**:

* Implemented first-seen retention by source-scoped fingerprint.
* Added total and per-source duplicate summaries with duplicate rates and high-rate flags.
* Verified browser and analyst arrays are filtered from the same duplicate-id set.

**Files Changed**:

* `scripts/extensions/trend-finder/sources/signal-identity.ts` - Added deduplication implementation and counted summaries.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/tasks.md` - Marked T009 complete and updated progress.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/implementation-notes.md` - Logged dedup implementation.

**BQC Fixes**:

* Duplicate action prevention: repeated same-source fingerprints are suppressed deterministically before collector analysis/scoring consumers see them.
* State freshness on re-entry: dedup state is local to each helper call and cannot leak between collection runs.

**Verification**:

* `bunx vitest run scripts/extensions/trend-finder/sources/__tests__/signal-identity.test.ts` - passed (6 tests).

***

### Task T008 - Extend analyst evidence identity metadata

**Started**: 2026-06-14 00:25 **Completed**: 2026-06-14 00:26 **Duration**: 1 minute

**Notes**:

* Added optional script-only identity and syndication metadata to `TrendEvidenceForAnalysis`.
* Added schema fallback/default handling for legacy evidence that lacks identity fields.
* Updated analyst request serialization to include bounded syndication counts while excluding raw normalized URLs, content hashes, and source fingerprints from runtime request data.

**Files Changed**:

* `scripts/lib/ai-runtime/trend-analyst.ts` - Added identity/syndication types, schema defaults, and request serialization boundary.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/tasks.md` - Marked T008 complete and updated progress.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/implementation-notes.md` - Logged analyst contract changes.

**BQC Fixes**:

* Error information boundaries: raw identity fields are excluded from the AI request serializer.
* Contract alignment: optional schema defaults preserve legacy analyst evidence parsing.

**Verification**:

* `bunx vitest run scripts/lib/ai-runtime/__tests__/trend-analyst.test.ts` - passed (27 tests).

***

### Task T007 - Add focused helper tests

**Started**: 2026-06-14 00:24 **Completed**: 2026-06-14 00:25 **Duration**: 1 minute

**Notes**:

* Added tests for URL normalization, malformed URL fallback, content hash stability, source-scoped fingerprints, same-source duplicate removal, and cross-source syndication counts.
* Verified browser-safe helper output does not include raw normalized URLs or content hashes.

**Files Changed**:

* `scripts/extensions/trend-finder/sources/__tests__/signal-identity.test.ts` - Added focused identity helper tests.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/tasks.md` - Marked T007 complete and updated progress.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/implementation-notes.md` - Logged helper tests and verification.

**BQC Fixes**:

* Failure path completeness: tests verify malformed URLs are deterministic and non-throwing.
* Error information boundaries: tests verify browser helper output omits raw identity fields.

**Verification**:

* `bunx vitest run scripts/extensions/trend-finder/sources/__tests__/signal-identity.test.ts` - passed (6 tests).

***

### Task T006 - Define identity, duplicate, and syndication output types

**Started**: 2026-06-14 00:24 **Completed**: 2026-06-14 00:24 **Duration**: 1 minute

**Notes**:

* Added explicit identity metadata, duplicate source summary, duplicate run summary, syndication group summary, and browser-safe count output types.
* Browser evidence receives only `syndicationCount` and `syndicationEvidenceCount`; raw normalized URLs and hashes stay on script-only metadata.

**Files Changed**:

* `scripts/extensions/trend-finder/sources/signal-identity.ts` - Added output and summary types.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/tasks.md` - Marked T006 complete and updated progress.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/implementation-notes.md` - Logged type boundary.

**BQC Fixes**:

* Error information boundaries: browser-facing helper output is count-only and does not expose normalized URLs or hashes.

***

### Task T005 - Create content hash and source fingerprint helpers

**Started**: 2026-06-14 00:24 **Completed**: 2026-06-14 00:24 **Duration**: 1 minute

**Notes**:

* Added stable SHA-256 content hashes from normalized title, host, and leading path segments.
* Added per-source fingerprints that combine source identity with normalized URL or content-hash fallback.
* Added empty-field handling through normalized snippet or explicit empty sentinel input.

**Files Changed**:

* `scripts/extensions/trend-finder/sources/signal-identity.ts` - Added content hash and source fingerprint helpers.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/tasks.md` - Marked T005 complete and updated progress.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/implementation-notes.md` - Logged fingerprint work.

**BQC Fixes**:

* Contract alignment: helper output is deterministic and bounded to stable string fields for downstream collector, trace, and scoring consumers.

***

### Task T004 - Create URL normalization helpers

**Started**: 2026-06-14 00:21 **Completed**: 2026-06-14 00:24 **Duration**: 3 minutes

**Notes**:

* Added deterministic URL normalization that lowercases hosts, removes `www.`, strips tracking query parameters, sorts retained query parameters, removes fragments, and cleans repeated path slashes.
* Added malformed-input fallback that returns a stable script-only `malformed:` identity string instead of throwing.

**Files Changed**:

* `scripts/extensions/trend-finder/sources/signal-identity.ts` - Added URL normalization and fallback helpers.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/tasks.md` - Marked T004 complete and updated progress.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/implementation-notes.md` - Logged normalization work.

**BQC Fixes**:

* Failure path completeness: malformed URLs produce deterministic fallback identity metadata instead of failing collection.

***

### Task T003 - Confirm source-helper test target and import conventions

**Started**: 2026-06-14 00:20 **Completed**: 2026-06-14 00:20 **Duration**: 1 minute

**Notes**:

* Confirmed source-helper tests live under `scripts/extensions/trend-finder/sources/__tests__/`.
* Confirmed existing tests import Vitest from `vitest` and helpers with relative imports such as `../health`.
* Planned the new helper test target at `scripts/extensions/trend-finder/sources/__tests__/signal-identity.test.ts`.

**Files Changed**:

* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/tasks.md` - Marked T003 complete and updated progress.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/implementation-notes.md` - Logged test-target convention.

**BQC Fixes**:

* N/A - setup verification only.

***

### Task T002 - Verify Trends-Finderz reference behavior

**Started**: 2026-06-14 00:20 **Completed**: 2026-06-14 00:20 **Duration**: 1 minute

**Notes**:

* Reviewed `EXAMPLES/trends-finderz/lib/signals/signal-fingerprint.ts`.
* Confirmed local helpers should use deterministic SHA-256 output, normalized URL/title/host/path content identity, and source-scoped fingerprints.
* Noted this repo must keep raw normalized URLs and hashes script-side, exposing only bounded counts to browser payloads.

**Files Changed**:

* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/tasks.md` - Marked T002 complete and updated progress.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/implementation-notes.md` - Logged reference behavior.

**BQC Fixes**:

* N/A - setup verification only.

***

### Task T001 - Verify Phase 27 collector, scoring, schema, and trace baselines

**Started**: 2026-06-14 00:18 **Completed**: 2026-06-14 00:20 **Duration**: 2 minutes

**Notes**:

* Verified collector evidence preparation, source collection, trace emission, and scoring handoff paths before edits.
* Verified scoring context separates full evidence rows from `scoringEvidence`, which is the correct hook for syndication-aware scoring.
* Verified browser schema and engine trace schemas currently carry count-only evidence metadata.

**Files Changed**:

* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/tasks.md` - Marked T001 complete and updated progress.
* `.spec_system/specs/phase28-session01-cross-source-signal-identity-and-dedup/implementation-notes.md` - Logged baseline verification.

**BQC Fixes**:

* N/A - setup verification only.

***

## Task Log

### 2026-06-14 - Session Start

**Environment verified**:

* [x] Prerequisites confirmed
* [x] Tools available
* [x] Directory structure ready

***


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