> 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-session06-lifecycle-stage-taxonomy/implementation-notes.md).

# Implementation Notes

**Session ID**: `phase27-session06-lifecycle-stage-taxonomy` **Started**: 2026-06-13 00:42 **Last Updated**: 2026-06-13 02:00

***

## Session Progress

| Metric              | Value   |
| ------------------- | ------- |
| Tasks Completed     | 20 / 20 |
| Estimated Remaining | 0 hours |
| Blockers            | 0       |

***

## Task Log

### 2026-06-13 - Session Start

**Environment verified**:

* [x] Prerequisites confirmed by `.spec_system/scripts/check-prereqs.sh --json --env`
* [x] Bun available at required version 1.3.14
* [x] Directory structure ready for active session
* [x] Local package scripts expose TypeScript and Vitest through `node_modules/.bin`

***

### Task T001 - Verify analyzer state, completed prerequisites, and lifecycle PRD scope

**Started**: 2026-06-13 00:42 **Completed**: 2026-06-13 00:42 **Duration**: 1 minute

**Notes**:

* Analyzer resolved current session as `phase27-session06-lifecycle-stage-taxonomy`.
* Session directory exists with `spec.md` and `tasks.md`.
* Project is not package-scoped for this session.
* Phase 27 is in progress and prerequisite sessions `phase27-session02-deterministic-derived-signals-and-risk-flags` and `phase27-session05-velocity-dynamics-upgrade` are listed in completed sessions.
* PRD scope matches the session spec: deterministic lifecycle stage taxonomy, additive schema field, card chip, Workbench column/filter, radar stage coloring, and tests.
* Tool prerequisite helper reports global `tsc` and `vitest` as unavailable, but repo-local bins exist and package scripts route through them.

**Files Changed**:

* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/implementation-notes.md` - created session progress log and recorded T001 verification.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/tasks.md` - marked T001 complete and updated progress summary.

### Task T002 - Inspect lifecycle-adjacent runtime and UI baselines

**Started**: 2026-06-13 00:42 **Completed**: 2026-06-13 00:43 **Duration**: 1 minute

**Notes**:

* `scripts/lib/ai-runtime/scoring.ts` already derives saturation, hidden-gem score, movement, and velocity dynamics before returning each `TrendTopic`.
* `scripts/lib/ai-runtime/source-breakdown.ts` currently adds role shares, consensus ratio, and builder signal after scoring, so lifecycle derivation must either use scoring-local evidence roles or tolerate later role-share enrichment.
* `scripts/extensions/trend-finder/collector.ts` logs `scoring.completed` after source breakdowns and source-local signals, which is the right point for sanitized lifecycle counters.
* `src/extensions/trend-finder/schema.ts` uses additive Zod defaults and catch fallbacks for derived branches.
* `src/extensions/trend-finder/view-model.ts` centralizes display labels, tones, radar projection metadata, and accessibility text.
* Signal Workbench uses explicit row fields, bounded filter facets, stable sort keys, and deterministic tie-breakers.
* Trend cards, Workbench table rows, and Signal Radar already use compact chip/pill styles with accessible labels and titles.
* `docs/adr/0001-extension-platform-foundation.md` confirms static extension boundaries and script-side collector isolation.

**Files Changed**:

* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/implementation-notes.md` - recorded baseline orientation.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/tasks.md` - marked T002 complete and updated progress summary.

### Task T003 - Create pure lifecycle classifier helper

**Started**: 2026-06-13 00:43 **Completed**: 2026-06-13 00:46 **Duration**: 3 minutes

**Notes**:

* Added `deriveTrendLifecycle` with bounded stages `unknown`, `whisper`, `builder`, `creator`, and `saturated`.
* Exported threshold constants so classifier boundaries can be covered by tests and reused by later prediction work.
* Normalized saturation, counts, role shares, velocity state, and movement context before classification.
* Added explicit `unknown` fallbacks for missing saturation, source-role mix, source diversity, evidence, or short history without a bounded velocity signal.
* Stage precedence is saturated, builder, whisper, creator, then unknown.
* Verified `bun run typecheck:scripts` passes after adding the helper.

**Files Changed**:

* `scripts/lib/ai-runtime/lifecycle.ts` - created pure lifecycle classifier, thresholds, confidence scoring, input summary, and provenance notes.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/implementation-notes.md` - recorded T003 implementation.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/tasks.md` - marked T003 complete and updated progress summary.

**BQC Fixes**:

* Failure path completeness: classifier returns caller-visible `unknown` notes instead of silently defaulting to a maturity stage.
* Contract alignment: script type check confirmed the helper compiles against existing runtime/schema types.

### Task T004 - Extend scoring lifecycle input contract

**Started**: 2026-06-13 00:46 **Completed**: 2026-06-13 00:49 **Duration**: 3 minutes

**Notes**:

* Added typed scoring-side lifecycle input builders for saturation, source diversity, evidence count, movement, role shares, builder signal, velocity dynamics, and appearance count.
* Role-share derivation is deterministic, de-duplicates evidence IDs, follows the schema role order, and rounds shares to the existing three-decimal convention.
* Appearance count now has an explicit fallback: historical context count, previous snapshot as two appearances, first-run new topic as one appearance, otherwise unavailable.
* Verified `bun run typecheck:scripts` passes after the scoring contract changes.

**Files Changed**:

* `scripts/lib/ai-runtime/scoring.ts` - added lifecycle input helper types and normalization functions for later scoring attachment.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/implementation-notes.md` - recorded T004 implementation.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/tasks.md` - marked T004 complete and updated progress summary.

**BQC Fixes**:

* Contract alignment: scoring-side lifecycle inputs now normalize counts and role shares before crossing into the classifier contract.

### Task T005 - Add bounded lifecycle schema defaults

**Started**: 2026-06-13 00:49 **Completed**: 2026-06-13 00:53 **Duration**: 4 minutes

**Notes**:

* Added bounded lifecycle stages and velocity-state enums to the Trend Finder schema.
* Added compact `DEFAULT_TREND_TOPIC_LIFECYCLE` with explicit `unknown` stage and unavailable input summary.
* Added `TrendLifecycleInputSummarySchema` and `TrendTopicLifecycleSchema` with strict parsing and catch fallback to the default unknown object.
* Added additive `lifecycle` field to `TrendTopicSchema`.
* Kept `TrendTopic.lifecycle` optional in the exported TypeScript type so hand-built legacy topics remain source-compatible while parsed payloads still receive defaults.
* Verified `bun run typecheck` and `bun run typecheck:scripts` pass.

**Files Changed**:

* `src/extensions/trend-finder/schema.ts` - added lifecycle enums, default, schemas, topic field, and exported types.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/implementation-notes.md` - recorded T005 implementation.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/tasks.md` - marked T005 complete and updated progress summary.

**BQC Fixes**:

* Trust boundary enforcement: malformed lifecycle branches parse through a bounded schema and fall back to `unknown`.
* Contract alignment: app and script type checks confirmed the schema remains compatible across browser and runtime code.

### Task T006 - Add lifecycle view-model projection

**Started**: 2026-06-13 00:53 **Completed**: 2026-06-13 00:59 **Duration**: 6 minutes

**Notes**:

* Added lifecycle view-model contracts for labels, descriptions, tones, confidence labels, derivation notes, input summaries, accessibility text, and radar color metadata.
* Added exhaustive stage handling for `unknown`, `whisper`, `builder`, `creator`, and `saturated`.
* Attached lifecycle projection to generated topic card view models.
* Added lifecycle metadata to radar point view models and included lifecycle stage in radar aria labels.
* Kept `TopicCardViewModel.lifecycle` optional and added a fallback projection for legacy test helpers that construct view models directly.
* Verified `bun run typecheck` passes.

**Files Changed**:

* `src/extensions/trend-finder/view-model.ts` - added lifecycle projection helpers, card view-model lifecycle, and radar lifecycle metadata.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/implementation-notes.md` - recorded T006 implementation.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/tasks.md` - marked T006 complete and updated progress summary.

**BQC Fixes**:

* Accessibility and platform compliance: lifecycle view models include descriptive aria labels and radar point aria text.
* Contract alignment: optional-safe projection preserves direct legacy view-model construction while parsed topics still default to `unknown`.

### Task T007 - Create reusable lifecycle chip component

**Started**: 2026-06-13 00:59 **Completed**: 2026-06-13 01:01 **Duration**: 2 minutes

**Notes**:

* Added `LifecycleChip` with stable height, minimum width, bounded text, title text, and aria label sourced from the lifecycle view model.
* The chip accepts compact and default sizing so cards and dense tables can share the same component.
* Verified `bun run typecheck` passes.

**Files Changed**:

* `src/extensions/trend-finder/components/lifecycle-chip.tsx` - created reusable lifecycle chip component.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/implementation-notes.md` - recorded T007 implementation.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/tasks.md` - marked T007 complete and updated progress summary.

**BQC Fixes**:

* Accessibility and platform compliance: chip exposes stage, confidence, and derivation note through accessible text and title.

### Task T008 - Add lifecycle fixture states

**Started**: 2026-06-13 01:01 **Completed**: 2026-06-13 01:04 **Duration**: 3 minutes

**Notes**:

* Added default fixture lifecycle as explicit `unknown`.
* Added creator lifecycle state for `Structured Output Grammars`.
* Added builder lifecycle state for `Differentiable Tool Use`.
* Added explicit unknown lifecycle state for `Sparse MoE Fine-Tuning` where saturation and role mix are unavailable.
* Verified `bun run typecheck` passes.

**Files Changed**:

* `src/extensions/trend-finder/fixtures.ts` - added lifecycle defaults and representative available/unknown fixture states.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/implementation-notes.md` - recorded T008 implementation.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/tasks.md` - marked T008 complete and updated progress summary.

**BQC Fixes**:

* State freshness on re-entry: fixture topics now carry explicit unknown lifecycle defaults instead of relying on stale omitted fields.
* Contract alignment: fixture lifecycle objects match the schema branch and app type check passes.

## Checkpoint - Foundation Complete

* Completed setup and foundation tasks T001-T008.
* Current verification: `bun run typecheck` and `bun run typecheck:scripts` pass after schema/runtime changes.
* Next task: derive lifecycle in scoring and attach the lifecycle object to each scored topic.

### Task T009 - Derive lifecycle in scoring

**Started**: 2026-06-13 01:04 **Completed**: 2026-06-13 01:07 **Duration**: 3 minutes

**Notes**:

* Scoring now calls `deriveTrendLifecycle` after saturation, velocity dynamics, movement, and historical topic context are available.
* Attached the lifecycle object to every scored `TrendTopic`.
* Reused the typed lifecycle input helper from T004 so low-history and missing-input topics flow into the classifier consistently.
* Verified `bun run typecheck:scripts` passes.

**Files Changed**:

* `scripts/lib/ai-runtime/scoring.ts` - wired lifecycle derivation and topic output attachment.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/implementation-notes.md` - recorded T009 implementation.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/tasks.md` - marked T009 complete and updated progress summary.

**BQC Fixes**:

* Contract alignment: scored topics now carry schema-compatible lifecycle objects.
* Failure path completeness: classifier-generated unknown notes are included on runtime output when inputs are insufficient.

### Task T010 - Add lifecycle scoring trace summary

**Started**: 2026-06-13 01:07 **Completed**: 2026-06-13 01:11 **Duration**: 4 minutes

**Notes**:

* Added aggregate lifecycle summary counters to `scoring.completed`.
* Summary includes topic count, available count, unknown count, average confidence, and per-stage counts.
* Kept trace output sanitized and compact: no raw archives, private paths, derivation inputs, or per-topic lifecycle notes are logged.
* Verified `bun run typecheck:scripts` passes.

**Files Changed**:

* `scripts/extensions/trend-finder/collector.ts` - added lifecycle summary helper and scoring trace counters.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/implementation-notes.md` - recorded T010 implementation.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/tasks.md` - marked T010 complete and updated progress summary.

**BQC Fixes**:

* Error information boundaries: trace data is limited to aggregate lifecycle counters and does not expose private paths or raw history.

### Task T011 - Render lifecycle chips on trend cards

**Started**: 2026-06-13 01:11 **Completed**: 2026-06-13 01:13 **Duration**: 2 minutes

**Notes**:

* Trend cards now render `LifecycleChip` alongside the topic status chip.
* Cards use the lifecycle view model when present and fall back to `getTopicLifecycleViewModel(topic)` for direct legacy view-model construction.
* Verified `bun run typecheck` passes.

**Files Changed**:

* `src/extensions/trend-finder/components/trend-card.tsx` - rendered compact lifecycle chip in card headers.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/implementation-notes.md` - recorded T011 implementation.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/tasks.md` - marked T011 complete and updated progress summary.

**BQC Fixes**:

* Accessibility and platform compliance: chip carries lifecycle aria label and derivation title text through the reusable component.

### Task T012 - Add lifecycle Workbench model fields, filters, facets, and sorting

**Started**: 2026-06-13 01:13 **Completed**: 2026-06-13 01:19 **Duration**: 6 minutes

**Notes**:

* Added lifecycle row projection with stage, label, confidence label, derivation note, and full lifecycle view model.
* Added lifecycle search text from label and derivation note.
* Added lifecycle filter state and default filter value.
* Added lifecycle sort key with explicit stage order and existing deterministic tie-breakers.
* Added lifecycle facet counts from the bounded stage list.
* Verified `bun run typecheck` passes.

**Files Changed**:

* `src/extensions/trend-finder/signal-workbench-model.ts` - added lifecycle fields, filtering, facets, search text, and sorting.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/implementation-notes.md` - recorded T012 implementation.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/tasks.md` - marked T012 complete and updated progress summary.

**BQC Fixes**:

* Contract alignment: Workbench rows consume lifecycle view-model projection instead of classifier internals.
* State freshness on re-entry: lifecycle filter participates in the existing default/reset filter object.
* Concurrency safety: sort uses existing pure comparator and deterministic tie-breakers without mutable shared state.

### Task T013 - Add lifecycle Workbench filter control

**Started**: 2026-06-13 01:19 **Completed**: 2026-06-13 01:23 **Duration**: 4 minutes

**Notes**:

* Added a native lifecycle filter select to Signal Workbench controls.
* The filter uses lifecycle facet counts and the existing `onFiltersChange` path, which resets pagination in the parent view on filter changes.
* Native label/select structure preserves accessible labeling.
* Verified `bun run typecheck` passes.

**Files Changed**:

* `src/extensions/trend-finder/components/signal-workbench-controls.tsx` - added lifecycle filter select.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/implementation-notes.md` - recorded T013 implementation.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/tasks.md` - marked T013 complete and updated progress summary.

**BQC Fixes**:

* State freshness on re-entry: lifecycle filter flows through the same filter update path that resets pagination.
* Accessibility and platform compliance: lifecycle filter uses the existing labeled native select pattern.

### Task T014 - Add lifecycle Workbench table column

**Started**: 2026-06-13 01:23 **Completed**: 2026-06-13 01:29 **Duration**: 6 minutes

**Notes**:

* Added sortable `Life` column to the Signal Workbench table.
* Rendered compact `LifecycleChip` in each row.
* Added lifecycle labels to the topic summary chips and expanded detail metrics.
* Increased table width and column count so dense columns remain stable.
* Verified `bun run typecheck` passes.

**Files Changed**:

* `src/extensions/trend-finder/components/signal-workbench-table.tsx` - added lifecycle table column, compact chips, and expanded detail metric.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/implementation-notes.md` - recorded T014 implementation.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/tasks.md` - marked T014 complete and updated progress summary.

**BQC Fixes**:

* Accessibility and platform compliance: table cells use the shared lifecycle chip with aria labels and derivation title text.
* Contract alignment: table column uses Workbench row lifecycle view model, not raw classifier internals.

## Checkpoint - Runtime And Workbench Wiring

* Completed implementation tasks T009-T014.
* Current verification: `bun run typecheck` and `bun run typecheck:scripts` pass after lifecycle runtime, trace, card, controls, and table changes.
* Next task: recolor Signal Radar points by lifecycle stage and add a compact stage legend.

### Task T015 - Recolor Signal Radar by lifecycle stage

**Started**: 2026-06-13 01:29 **Completed**: 2026-06-13 01:36 **Duration**: 7 minutes

**Notes**:

* Radar topic points now use lifecycle color metadata instead of movement tone.
* Fallback nodes remain visually distinct through dashed/opacity treatment and existing fallback notices.
* Added a compact stage legend for all bounded lifecycle stages.
* Tooltip copy now surfaces lifecycle stage beside score.
* Verified `bun run typecheck` passes.

**Files Changed**:

* `src/extensions/trend-finder/components/signal-radar.tsx` - recolored radar points by lifecycle stage and added lifecycle legend.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/implementation-notes.md` - recorded T015 implementation.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/tasks.md` - marked T015 complete and updated progress summary.

**BQC Fixes**:

* Accessibility and platform compliance: legend has an aria label and point aria labels already include lifecycle stage.
* Contract alignment: radar consumes projected lifecycle color metadata from the view model.

### Task T016 - Update committed example data

**Started**: 2026-06-13 01:36 **Completed**: 2026-06-13 01:42 **Duration**: 6 minutes

**Notes**:

* Added compact `whisper` lifecycle data to the existing example emerging topic.
* Added a small explicit `unknown` lifecycle topic to exercise legacy-safe unavailable rendering.
* Added matching saturation, role-share, builder-share, and movement fields where the example lifecycle uses them.
* Verified `jq empty src/data/live-data.example.json` passes.
* Verified `bun run typecheck` passes.

**Files Changed**:

* `src/data/live-data.example.json` - added compact lifecycle examples and explicit unknown fallback topic.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/implementation-notes.md` - recorded T016 implementation.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/tasks.md` - marked T016 complete and updated progress summary.

**BQC Fixes**:

* Contract alignment: example lifecycle branches use bounded schema fields and validated JSON.

### Task T017 - Write lifecycle classifier boundary tests

**Started**: 2026-06-13 01:42 **Completed**: 2026-06-13 01:46 **Duration**: 4 minutes

**Notes**:

* Added focused classifier tests for whisper, builder, creator, saturated, unknown, missing saturation, missing role shares, low history, and saturated precedence.
* The initial test run exposed that creator precedence was taking low-saturation early signals before whisper.
* Updated classifier precedence to saturated, builder, whisper, creator, then unknown.
* Verified `bunx vitest run scripts/lib/ai-runtime/__tests__/lifecycle.test.ts` passes.

**Files Changed**:

* `scripts/lib/ai-runtime/__tests__/lifecycle.test.ts` - added lifecycle classifier tests.
* `scripts/lib/ai-runtime/lifecycle.ts` - corrected whisper/creator precedence.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/implementation-notes.md` - recorded T017 implementation.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/tasks.md` - marked T017 complete and updated progress summary.

**BQC Fixes**:

* Contract alignment: tests verify stage precedence and missing-input unknown behavior.

### Task T018 - Extend scoring and schema lifecycle regressions

**Started**: 2026-06-13 01:46 **Completed**: 2026-06-13 01:51 **Duration**: 5 minutes

**Notes**:

* Added scoring integration coverage for builder, saturated, and unknown lifecycle output from the real scoring path.
* Added schema coverage for legacy lifecycle defaults, bounded lifecycle parsing, malformed lifecycle fallback, and private-field rejection through strict catch behavior.
* Verified `bunx vitest run scripts/lib/ai-runtime/__tests__/scoring.test.ts` passes.
* Verified `bunx vitest run src/lib/__tests__/trend-finder-schema.test.ts` passes.

**Files Changed**:

* `scripts/lib/ai-runtime/__tests__/scoring.test.ts` - added lifecycle scoring integration assertions.
* `src/lib/__tests__/trend-finder-schema.test.ts` - added lifecycle schema default and malformed-branch assertions.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/implementation-notes.md` - recorded T018 implementation.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/tasks.md` - marked T018 complete and updated progress summary.

**BQC Fixes**:

* Trust boundary enforcement: schema tests verify malformed lifecycle input falls back to the bounded unknown object.
* Contract alignment: scoring tests verify runtime lifecycle output matches the browser schema contract.

### Task T019 - Add lifecycle UI and model tests

**Started**: 2026-06-13 01:51 **Completed**: 2026-06-13 01:57 **Duration**: 6 minutes

**Notes**:

* Added view-model tests for lifecycle labels, tones, notes, accessibility text, and radar color metadata.
* Added Workbench model tests for lifecycle row projection, search, filtering, facets, sorting, and deterministic stage order.
* Added radar projection tests for lifecycle color metadata and lifecycle aria text.
* Added component test coverage for visible lifecycle filter and builder-stage filtering in Signal Workbench.
* Verified focused UI/model tests pass.

**Files Changed**:

* `src/extensions/trend-finder/__tests__/view-model.test.ts` - added lifecycle projection assertions.
* `src/extensions/trend-finder/__tests__/signal-workbench-model.test.ts` - added lifecycle filter/facet/search/sort assertions.
* `src/extensions/trend-finder/__tests__/signal-radar-projection.test.ts` - added lifecycle radar metadata assertions.
* `src/extensions/trend-finder/components/__tests__/signal-workbench-view.test.tsx` - added visible lifecycle filter and stage filtering assertions.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/implementation-notes.md` - recorded T019 implementation.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/tasks.md` - marked T019 complete and updated progress summary.

**BQC Fixes**:

* Accessibility and platform compliance: tests assert lifecycle control visibility and radar aria text includes lifecycle stage.
* Contract alignment: tests verify UI surfaces consume view-model lifecycle metadata.

### Task T020 - Run focused validation and record implementation results

**Started**: 2026-06-13 01:57 **Completed**: 2026-06-13 02:00 **Duration**: 3 minutes

**Notes**:

* Ran Prettier on touched TypeScript, TSX, and JSON files.
* Verified `bun run typecheck` passes.
* Verified `bun run typecheck:scripts` passes.
* Verified focused lifecycle tests pass: classifier, scoring, schema, view model, Workbench model, radar projection, and Workbench view.
* Verified full test suite passes with `bun run test`.
* Verified `jq empty src/data/live-data.example.json` passes.
* Verified changed/new files contain ASCII-only characters.
* Verified `src/data/live-data.example.json` is 37,937 bytes, well under the shared 1 MB payload limit.
* Verified `git diff --check` passes.

**Files Changed**:

* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/implementation-notes.md` - recorded final validation.
* `.spec_system/specs/phase27-session06-lifecycle-stage-taxonomy/tasks.md` - marked T020 and completion checklist complete.

**BQC Fixes**:

* Contract alignment: full validation confirms runtime, schema, view-model, and UI tests agree.
* Failure path completeness: tests cover explicit unknown lifecycle fallback and malformed lifecycle input fallback.

## Final Implementation Summary

* Added deterministic lifecycle classification with bounded stages `unknown`, `whisper`, `builder`, `creator`, and `saturated`.
* Projected lifecycle into scored topics, schema defaults, fixtures, example data, cards, Workbench rows/filters/table, and Signal Radar colors/legend.
* Added sanitized aggregate lifecycle trace counters.
* Added focused tests across classifier, scoring, schema, view model, Workbench model/view, and radar projection.
* All 20 tasks are complete and the session is ready for the validate workflow step.


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