> 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-session11-theme-rollups-and-outlier-ideas/implementation-notes.md).

# Implementation Notes

**Session ID**: `phase27-session11-theme-rollups-and-outlier-ideas` **Started**: 2026-06-13 05:36 **Last Updated**: 2026-06-13 06:16

***

## Session Progress

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

***

## Task Log

### 2026-06-13 - Session Start

**Environment verified**:

* [x] Prerequisites confirmed with `.spec_system/scripts/check-prereqs.sh --json --env`
* [x] Bun available at 1.3.14
* [x] Repo-local TypeScript available at 6.0.3 through `node_modules/.bin/tsc`
* [x] Repo-local Vitest available at 4.1.6 through `node_modules/.bin/vitest`
* [x] Directory structure ready

**Notes**:

* The generic tool checker only detects global `typescript` and `vitest` binaries and reported them missing. The project uses Bun scripts and repo-local binaries, which are present.
* No database prerequisites apply to this session.

***

### Task T001 - Verify Session 11 prerequisites, source constraints, and no-embedding-dependency boundary

**Started**: 2026-06-13 05:36 **Completed**: 2026-06-13 05:37 **Duration**: 1 minute

**Notes**:

* Confirmed completed dependency sessions from deterministic spec state and session spec context.
* Confirmed Session 11 is limited to theme rollups, top-N outlier ideas, cache reuse, and an investigate-only embedding ADR.
* Confirmed `package.json` does not add an embedding model runtime dependency for this session.

**Files Changed**:

* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/tasks.md` - Marked T001 complete and updated progress.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/implementation-notes.md` - Logged prerequisite and dependency-boundary verification.

***

### Task T002 - Confirm current focused test commands, Workbench targets, and cache regression targets

**Started**: 2026-06-13 05:37 **Completed**: 2026-06-13 05:37 **Duration**: 1 minute

**Notes**:

* Confirmed project commands from `package.json`: `bun run test`, `bun run typecheck`, `bun run typecheck:scripts`, `bun run lint`, and `bun run format:check`.
* Confirmed focused test targets for this session include helper tests under `scripts/extensions/trend-finder/__tests__/`, schema coverage in `src/lib/__tests__/trend-finder-schema.test.ts`, analyst coverage in `scripts/lib/ai-runtime/__tests__/trend-analyst.test.ts`, collector coverage in `scripts/extensions/trend-finder/__tests__/collector.test.ts`, Workbench model coverage in `src/extensions/trend-finder/__tests__/signal-workbench-model.test.ts`, and Workbench component coverage in `src/extensions/trend-finder/components/__tests__/signal-workbench-view.test.tsx`.
* Confirmed cache regression target is `scripts/extensions/trend-finder/__tests__/enrichment-cache.test.ts`.

**Files Changed**:

* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/tasks.md` - Marked T002 complete and updated progress.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/implementation-notes.md` - Logged command and target verification.

***

### Task T003 - Create implementation-notes scaffold for session progress tracking

**Started**: 2026-06-13 05:36 **Completed**: 2026-06-13 05:37 **Duration**: 1 minute

**Notes**:

* Created the session implementation notes with environment verification, progress metrics, and task logging sections.
* Recorded the repo-local TypeScript and Vitest tool verification caveat from setup.

**Files Changed**:

* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/implementation-notes.md` - Added scaffold and T003 log entry.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/tasks.md` - Marked T003 complete and updated progress.

***

### Task T004 - Create theme rollup helper for analyst label acceptance, keyword-overlap fallback, stable IDs, and deterministic ordering

**Started**: 2026-06-13 05:38 **Completed**: 2026-06-13 05:48 **Duration**: 10 minutes

**Notes**:

* Added `assignThemeRollups` with analyst label validation, generic-label rejection, Creator Lens keyword overlap fallback, stable theme IDs, keyword caps, and deterministic group ordering.
* Verified with `bun run typecheck:scripts` and `bun run typecheck`.

**Files Changed**:

* `scripts/extensions/trend-finder/theme-rollups.ts` - Added script-side theme rollup helper.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/tasks.md` - Marked T004 complete and updated progress.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/implementation-notes.md` - Logged T004 implementation.

***

### Task T005 - Create outlier idea helper for top-N source-local outlier selection, fallback text, cache candidates, provenance, and bounds

**Started**: 2026-06-13 05:40 **Completed**: 2026-06-13 05:48 **Duration**: 8 minutes

**Notes**:

* Added top-N source-local outlier selection using the existing available-baseline and moderate/strong/extreme lift criteria.
* Added bounded fallback idea text, analyst idea preference, explicit `ai` or `fallback` provenance, sanitized enrichment-cache candidates, cache summary parsing, and evidence attachment.
* Verified with `bun run typecheck:scripts` and `bun run typecheck`.

**Files Changed**:

* `scripts/extensions/trend-finder/outlier-ideas.ts` - Added outlier idea helper and cache candidate support.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/tasks.md` - Marked T005 complete and updated progress.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/implementation-notes.md` - Logged T005 implementation.

***

### Task T006 - Extend Trend Finder schema with topic theme metadata and outlier idea fields using additive defaults and reference-safe parsing

**Started**: 2026-06-13 05:38 **Completed**: 2026-06-13 05:48 **Duration**: 10 minutes

**Notes**:

* Added bounded topic theme metadata fields with additive defaults.
* Added optional bounded outlier idea payloads on evidence rows with provenance and cache-state fields.
* Added reference checks for browser-visible outlier idea evidence/topic references.
* Verified with `bun run typecheck:scripts` and `bun run typecheck`.

**Files Changed**:

* `src/extensions/trend-finder/schema.ts` - Added theme and outlier idea schema contracts.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/tasks.md` - Marked T006 complete and updated progress.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/implementation-notes.md` - Logged T006 implementation.

**BQC Fixes**:

* Contract alignment: Added schema defaults and reference validation so legacy payloads parse and browser-visible outlier ideas cannot reference unknown topics.

***

### Task T007 - Extend analyst contract for optional theme labels and outlier idea outputs with schema-validated input and explicit error mapping

**Started**: 2026-06-13 05:42 **Completed**: 2026-06-13 05:48 **Duration**: 6 minutes

**Notes**:

* Added optional `themeLabels` and `outlierIdeas` to the analyst output contract and schema hint.
* Added validation issue codes and reference checks for unknown topic IDs and unknown evidence IDs.
* Updated analyst prompts to keep optional labels/ideas bounded and evidence-grounded.
* Verified with `bun run typecheck:scripts` and `bun run typecheck`.

**Files Changed**:

* `scripts/lib/ai-runtime/trend-analyst.ts` - Extended analyst output schema, prompt, logging summaries, and validation.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/tasks.md` - Marked T007 complete and updated progress.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/implementation-notes.md` - Logged T007 implementation.

**BQC Fixes**:

* Trust boundary enforcement: Analyst theme labels and outlier ideas now pass schema validation and unknown-reference rejection before collector use.
* Error information boundaries: New validation issues use existing redaction and normalized issue mapping.

***

### Task T008 - Extend Workbench model contracts for theme groups, flat/grouped state, outlier idea labels, and deterministic search text

**Started**: 2026-06-13 05:44 **Completed**: 2026-06-13 05:48 **Duration**: 4 minutes

**Notes**:

* Added grouped/flat mode types, theme group projection, theme metadata on topic rows, and outlier idea labels on evidence/topic rows.
* Included theme and outlier idea fields in deterministic search text.
* Verified with `bun run typecheck:scripts` and `bun run typecheck`.

**Files Changed**:

* `src/extensions/trend-finder/signal-workbench-model.ts` - Added theme/outlier idea row contracts and group projection.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/tasks.md` - Marked T008 complete and updated progress.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/implementation-notes.md` - Logged T008 implementation.

**BQC Fixes**:

* Contract alignment: Workbench rows now project bounded schema fields instead of reading raw collector intermediates.

***

### Task T009 - Create embedding fallback clustering ADR with investigated options and no-runtime-dependency recommendation

**Started**: 2026-06-13 05:46 **Completed**: 2026-06-13 05:48 **Duration**: 2 minutes

**Notes**:

* Added ADR 0002 comparing local token similarity, local embedding models, and no fallback grouping.
* Recorded the decision to ship dependency-free token similarity now and defer embedding model dependencies to a future ADR.

**Files Changed**:

* `docs/adr/0002-trend-finder-embedding-fallback-clustering.md` - Added decision record.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/tasks.md` - Marked T009 complete and updated progress.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/implementation-notes.md` - Logged T009 implementation.

***

### Task T010 - Wire deterministic fallback theme labels into fallback topic generation without inventing source, metric, date, or URL references

**Started**: 2026-06-13 05:49 **Completed**: 2026-06-13 05:50 **Duration**: 1 minute

**Notes**:

* Fallback topic generation now runs generated topics through `assignThemeRollups` with the active Creator Lens.
* Verification caught widened literal inference for `status`; added an explicit `TrendTopic[]` annotation.
* Verified with `bun run typecheck:scripts`.

**Files Changed**:

* `scripts/extensions/trend-finder/topics.ts` - Applied deterministic theme rollups to fallback topics.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/tasks.md` - Marked T010 complete and updated progress.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/implementation-notes.md` - Logged T010 implementation.

**BQC Fixes**:

* Contract alignment: Preserved existing `TrendTopic` literal types after adding the rollup projection.

***

### Task T011 - Apply theme rollups through collector topic assembly with timeout-safe failure-path handling and bounded warning output

**Started**: 2026-06-13 05:50 **Completed**: 2026-06-13 05:51 **Duration**: 1 minute

**Notes**:

* Collector now applies `assignThemeRollups` after source-local topic derivation.
* Theme rollup warnings are capped before browser publication, and derivation failures fall back to existing topic output with an explicit warning.
* Verified with `bun run typecheck:scripts`.

**Files Changed**:

* `scripts/extensions/trend-finder/collector.ts` - Wired theme rollups, bounded warnings, and trace summaries.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/tasks.md` - Marked T011 complete and updated progress.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/implementation-notes.md` - Logged T011 implementation.

**BQC Fixes**:

* Failure path completeness: Theme derivation failures now produce an explicit warning while preserving existing scored topics.

***

### Task T012 - Merge analyst theme labels and outlier idea outputs with deterministic fallback and unknown-reference rejection

**Started**: 2026-06-13 05:42 **Completed**: 2026-06-13 05:51 **Duration**: 9 minutes

**Notes**:

* Analyst outputs now support optional theme labels and outlier ideas with explicit unknown-topic and unknown-evidence rejection.
* Collector merges accepted analyst labels/ideas through `assignThemeRollups` and `prepareOutlierIdeas`, with deterministic fallback when analyst fields are missing or invalid.
* Verified with `bun run typecheck:scripts`.

**Files Changed**:

* `scripts/lib/ai-runtime/trend-analyst.ts` - Added optional output contracts and reference validation.
* `scripts/extensions/trend-finder/collector.ts` - Merged analyst theme labels and outlier ideas into deterministic fallback paths.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/tasks.md` - Marked T012 complete and updated progress.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/implementation-notes.md` - Logged T012 implementation.

**BQC Fixes**:

* Trust boundary enforcement: Unknown analyst topic/evidence references are rejected before merge.
* Contract alignment: Collector consumes only validated analyst output fields and bounded fallback values.

***

### Task T013 - Wire top-N outlier idea candidate selection into the collector with bounded ordering and no new source calls

**Started**: 2026-06-13 05:50 **Completed**: 2026-06-13 05:51 **Duration**: 1 minute

**Notes**:

* Collector now selects source-local outlier idea candidates from already collected evidence after topic IDs and source-local signals are available.
* Candidate selection is capped and sorted deterministically by lift, actionability, relevance, timestamp, topic, title, and evidence ID.
* No new source adapter or source call was added.
* Verified with `bun run typecheck:scripts`.

**Files Changed**:

* `scripts/extensions/trend-finder/outlier-ideas.ts` - Added top-N candidate selection.
* `scripts/extensions/trend-finder/collector.ts` - Applied candidate selection during collection.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/tasks.md` - Marked T013 complete and updated progress.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/implementation-notes.md` - Logged T013 implementation.

**BQC Fixes**:

* External dependency resilience: Outlier ideas derive from existing collected evidence and do not introduce a new external call path.

***

### Task T014 - Reuse enrichment cache entries for unchanged outlier ideas with idempotency protection and sanitized summaries

**Started**: 2026-06-13 05:50 **Completed**: 2026-06-13 05:51 **Duration**: 1 minute

**Notes**:

* Outlier ideas now use the existing enrichment-cache helper with a distinct outlier idea enrichment type and a private outlier cache root.
* Cache summaries include only bounded idea/provenance fields and are parsed back through the browser-safe outlier idea schema before attachment.
* Cache failures attach deterministic fallback ideas and emit an explicit warning rather than silently dropping rows.
* Verified with `bun run typecheck:scripts`.

**Files Changed**:

* `scripts/extensions/trend-finder/outlier-ideas.ts` - Added sanitized cache candidate summaries and cache-result merge.
* `scripts/extensions/trend-finder/collector.ts` - Wired outlier idea cache merge/prune and combined cache run summary publication.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/tasks.md` - Marked T014 complete and updated progress.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/implementation-notes.md` - Logged T014 implementation.

**BQC Fixes**:

* Duplicate action prevention: The enrichment-cache key includes stable identity plus metadata fingerprint so unchanged candidates hit instead of rewriting.
* Error information boundaries: Cache summaries are sanitized by the existing helper and parsed through the public schema before browser publication.
* Failure path completeness: Cache failures fall back to deterministic ideas with an explicit warning.

***

### Task T015 - Render Workbench theme group headers and grouped empty states with stable layout and revalidation on filter changes

**Started**: 2026-06-13 05:52 **Completed**: 2026-06-13 05:54 **Duration**: 2 minutes

**Notes**:

* Signal Workbench now builds theme groups for the current page and renders group headers with topic, score, outlier, idea, provenance, and keyword summaries.
* Re-entry resets grouped mode and existing filter/page reset behavior remains intact.
* Empty state copy distinguishes grouped mode from flat mode.
* Verified with `bun run typecheck`.

**Files Changed**:

* `src/extensions/trend-finder/views/signal-workbench-view.tsx` - Added grouped mode state, theme groups, status counts, and table props.
* `src/extensions/trend-finder/components/signal-workbench-table.tsx` - Added grouped header rendering and grouped empty-state copy.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/tasks.md` - Marked T015 complete and updated progress.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/implementation-notes.md` - Logged T015 implementation.

**BQC Fixes**:

* State freshness on re-entry: Grouped mode resets with the run re-entry key alongside filters and sort.
* Accessibility and platform compliance: Group headers stay in the table structure with existing keyboard expansion controls unchanged.

***

### Task T016 - Add Workbench grouped/flat view controls with platform-appropriate accessibility labels, focus management, and input support

**Started**: 2026-06-13 05:52 **Completed**: 2026-06-13 05:54 **Duration**: 2 minutes

**Notes**:

* Added a grouped/flat segmented control using native buttons, `aria-pressed`, and existing focus-visible styling.
* Kept the control outside filter state so toggling view mode does not reset filters or sort.
* Verified with `bun run typecheck`.

**Files Changed**:

* `src/extensions/trend-finder/components/signal-workbench-controls.tsx` - Added grouped/flat view controls.
* `src/extensions/trend-finder/views/signal-workbench-view.tsx` - Wired grouped/flat mode state and callbacks.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/tasks.md` - Marked T016 complete and updated progress.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/implementation-notes.md` - Logged T016 implementation.

**BQC Fixes**:

* Accessibility and platform compliance: View mode uses native button controls with `aria-pressed` and keyboard focus styling.

***

### Task T017 - Render outlier idea details in Workbench rows with bounded text, provenance labels, and keyboard-accessible expanded content

**Started**: 2026-06-13 05:53 **Completed**: 2026-06-13 05:54 **Duration**: 1 minute

**Notes**:

* Evidence detail rows now render bounded outlier idea text with provenance and cache labels.
* Topic expanded details include an idea count pill while preserving the existing keyboard-accessible expand/collapse flow.
* Verified with `bun run typecheck`.

**Files Changed**:

* `src/extensions/trend-finder/components/signal-workbench-table.tsx` - Added outlier idea detail rendering and idea count pills.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/tasks.md` - Marked T017 complete and updated progress.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/implementation-notes.md` - Logged T017 implementation.

**BQC Fixes**:

* Accessibility and platform compliance: Outlier idea details are exposed inside the existing expanded content controlled by native buttons.

***

### Task T018 - Project theme labels and outlier idea summaries through shared Trend Finder view models with exhaustive state handling

**Started**: 2026-06-13 05:55 **Completed**: 2026-06-13 05:57 **Duration**: 2 minutes

**Notes**:

* Added shared topic theme and outlier idea view models with exhaustive provenance/cache-state labels.
* Evidence links now include an outlier idea projection, and generated topic card/selected trend view models expose theme and outlier summaries.
* Kept new topic-card fields optional so existing narrow test mocks remain valid.
* Verified with `bun run typecheck`.

**Files Changed**:

* `src/extensions/trend-finder/view-model.ts` - Added theme and outlier idea projections.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/tasks.md` - Marked T018 complete and updated progress.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/implementation-notes.md` - Logged T018 implementation.

**BQC Fixes**:

* Contract alignment: Shared consumers read projected, bounded theme and outlier idea view models rather than raw schema fields.

***

### Task T019 - Add bounded fixture coverage for theme labels, grouped rows, outlier ideas, and cache summary states

**Started**: 2026-06-13 05:58 **Completed**: 2026-06-13 05:59 **Duration**: 1 minute

**Notes**:

* Added fixture topic theme metadata for grouped Workbench rows.
* Added bounded outlier ideas with `ai` and `fallback` provenance plus `hit`, `miss`, and `stale` cache states.
* Verified with `bun run typecheck`.

**Files Changed**:

* `src/extensions/trend-finder/fixtures.ts` - Added bounded theme and outlier idea fixture data.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/tasks.md` - Marked T019 complete and updated progress.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/implementation-notes.md` - Logged T019 implementation.

**BQC Fixes**:

* Contract alignment: Fixture data uses schema-bounded theme and outlier idea fields.

***

### Task T020 - Add focused theme helper tests for fallback labels, analyst label validation, stable IDs, deterministic ordering, and caps

**Started**: 2026-06-13 06:00 **Completed**: 2026-06-13 06:10 **Duration**: 10 minutes

**Notes**:

* Added theme helper coverage for analyst labels, invalid/generic labels, Creator Lens overlap fallback, stable IDs, deterministic group ordering, URL rejection, and oversized label caps.
* Fixed an ambiguous test fixture where inherited structured-output text caused the agent-memory fallback case to group under structured output.
* Verified with `bunx vitest run scripts/extensions/trend-finder/__tests__/theme-rollups.test.ts scripts/extensions/trend-finder/__tests__/outlier-ideas.test.ts scripts/extensions/trend-finder/__tests__/enrichment-cache.test.ts`.

**Files Changed**:

* `scripts/extensions/trend-finder/__tests__/theme-rollups.test.ts` - Added focused theme rollup tests.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/tasks.md` - Marked T020 complete and updated progress.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/implementation-notes.md` - Logged T020 implementation.

**BQC Fixes**:

* Test quality: Removed ambiguous fixture inheritance so fallback grouping tests verify the intended branch.

***

### Task T021 - Add focused outlier idea and cache regression tests for top-N selection, cache hits, stale/skipped states, sanitized summaries, and bounds

**Started**: 2026-06-13 06:00 **Completed**: 2026-06-13 06:10 **Duration**: 10 minutes

**Notes**:

* Added outlier idea helper coverage for top-N ordering, invalid analyst idea fallback, cache hit/stale/skipped states, sanitized cache candidates, and selected-row attachment.
* Added enrichment-cache coverage to reject private outlier idea summary fields while accepting safe public summaries.
* Corrected fixture placement so the `ev-005` outlier idea is attached to `ev-005` instead of `ev-003`, matching the new schema reference validation.
* Verified with `bunx vitest run scripts/extensions/trend-finder/__tests__/theme-rollups.test.ts scripts/extensions/trend-finder/__tests__/outlier-ideas.test.ts scripts/extensions/trend-finder/__tests__/enrichment-cache.test.ts`.

**Files Changed**:

* `scripts/extensions/trend-finder/__tests__/outlier-ideas.test.ts` - Added focused outlier idea tests.
* `scripts/extensions/trend-finder/__tests__/enrichment-cache.test.ts` - Added outlier idea summary safety regression.
* `src/extensions/trend-finder/fixtures.ts` - Fixed outlier idea evidence placement.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/tasks.md` - Marked T021 complete and updated progress.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/implementation-notes.md` - Logged T021 implementation.

**BQC Fixes**:

* Contract alignment: Fixture outlier idea evidence IDs now match their containing evidence rows.
* Error information boundaries: Cache regression rejects private path fields in outlier idea summaries.

***

### Task T022 - Add schema and analyst tests for legacy defaults, invalid references, invented metadata rejection, theme labels, and outlier idea outputs

**Started**: 2026-06-13 06:02 **Completed**: 2026-06-13 06:11 **Duration**: 9 minutes

**Notes**:

* Added schema coverage for legacy theme defaults, outlier idea parsing/defaulting, private extra stripping, and cross-row reference rejection.
* Added analyst coverage for accepted optional theme labels/outlier ideas, unknown reference rejection, and invented metadata rejection in outlier idea text.
* Verified with `bunx vitest run src/lib/__tests__/trend-finder-schema.test.ts scripts/lib/ai-runtime/__tests__/trend-analyst.test.ts`.

**Files Changed**:

* `src/lib/__tests__/trend-finder-schema.test.ts` - Added theme/outlier idea schema coverage.
* `scripts/lib/ai-runtime/__tests__/trend-analyst.test.ts` - Added analyst output contract coverage.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/tasks.md` - Marked T022 complete and updated progress.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/implementation-notes.md` - Logged T022 implementation.

**BQC Fixes**:

* Contract alignment: Schema tests now guard legacy defaults and outlier idea reference safety.
* Trust boundary enforcement: Analyst tests now guard unknown references and invented metadata in optional outputs.

***

### Task T023 - Add collector and Workbench tests for theme publication, cache reuse, grouped/flat rendering, search, empty states, and outlier idea display

**Started**: 2026-06-13 06:04 **Completed**: 2026-06-13 06:14 **Duration**: 10 minutes

**Notes**:

* Added collector assertions that analyst theme labels and outlier ideas publish through topic/evidence browser data.
* Added Workbench model coverage for theme fields, outlier idea search text, deterministic theme groups, and outlier idea counts.
* Added Workbench component coverage for default grouped mode, flat toggle state, grouped empty state, and expanded outlier idea display.
* Verified with `bunx vitest run scripts/extensions/trend-finder/__tests__/collector.test.ts src/extensions/trend-finder/__tests__/signal-workbench-model.test.ts src/extensions/trend-finder/components/__tests__/signal-workbench-view.test.tsx`.

**Files Changed**:

* `scripts/extensions/trend-finder/__tests__/collector.test.ts` - Added collector publication coverage and source-local baseline fixture rows.
* `src/extensions/trend-finder/__tests__/signal-workbench-model.test.ts` - Added theme group and outlier idea projection coverage.
* `src/extensions/trend-finder/components/__tests__/signal-workbench-view.test.tsx` - Added grouped/flat UI and expanded idea rendering coverage.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/tasks.md` - Marked T023 complete and updated progress.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/implementation-notes.md` - Logged T023 implementation.

**BQC Fixes**:

* Test quality: Collector source-local fixture now uses matching public metrics and enough same-entity baseline rows to exercise the real outlier path.
* Duplicate action prevention: Collector test uses a unique temp cache for the outlier idea path to avoid stale cache entries influencing assertions.

***

### Task T024 - Run focused validation, typechecks, ASCII check, and record results in implementation notes

**Started**: 2026-06-13 06:14 **Completed**: 2026-06-13 06:16 **Duration**: 2 minutes

**Notes**:

* Ran the full focused session test set after formatting: 8 test files passed, 187 tests passed.
* Ran `bun run typecheck`: passed.
* Ran `bun run typecheck:scripts`: passed.
* Ran Prettier check over touched session files after applying formatting: passed.
* Ran ASCII scan over touched session files with `LC_ALL=C rg -n "[^\x00-\x7F]" ...`: no matches.

**Files Changed**:

* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/tasks.md` - Marked T024 complete and closed checklist.
* `.spec_system/specs/phase27-session11-theme-rollups-and-outlier-ideas/implementation-notes.md` - Logged final validation results.

**BQC Fixes**:

* N/A - validation-only task.

***

## Final Validation Summary

* `bunx vitest run scripts/extensions/trend-finder/__tests__/theme-rollups.test.ts scripts/extensions/trend-finder/__tests__/outlier-ideas.test.ts scripts/extensions/trend-finder/__tests__/enrichment-cache.test.ts src/lib/__tests__/trend-finder-schema.test.ts scripts/lib/ai-runtime/__tests__/trend-analyst.test.ts scripts/extensions/trend-finder/__tests__/collector.test.ts src/extensions/trend-finder/__tests__/signal-workbench-model.test.ts src/extensions/trend-finder/components/__tests__/signal-workbench-view.test.tsx` - passed, 187 tests.
* `bun run typecheck` - passed.
* `bun run typecheck:scripts` - passed.
* `bunx prettier --check <touched session files>` - passed after formatting.
* `LC_ALL=C rg -n "[^\x00-\x7F]" <touched session files>` - no matches.

## Session Summary

* Implemented deterministic theme rollups, collector integration, grouped/flat Workbench controls, and view-model projection.
* Implemented top-N outlier idea generation, analyst output merging, enrichment-cache reuse, sanitized summaries, and Workbench display.
* Added embedding fallback ADR recommending dependency-free token similarity for this session.
* Added focused helper, cache, schema, analyst, collector, model, and component coverage.
* BQC fixes applied across 17 tasks: contract alignment, trust-boundary validation, failure-path handling, cache safety, duplicate-action prevention, accessibility, state freshness, and test quality.


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://ai-os-and-trend-finder.gitbook.io/ai-os-and-trend-finder-docs/.spec_system/archive/sessions/phase27-session11-theme-rollups-and-outlier-ideas/implementation-notes.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.