> For the complete documentation index, see [llms.txt](https://faction-os.gitbook.io/faction-os-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://faction-os.gitbook.io/faction-os-docs/.spec_system/archive/sessions/phase15-session01-use-cases-hub-and-role-pages/implementation-notes.md).

# Implementation Notes

**Session ID**: `phase15-session01-use-cases-hub-and-role-pages` **Package**: public-website **Started**: 2026-06-01 22:40 **Last Updated**: 2026-06-01 23:07

***

## Session Progress

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

***

### Task T023 - Validate encoding and copy guardrails

**Started**: 2026-06-01 23:05 **Completed**: 2026-06-01 23:06 **Duration**: 1 minute

**Notes**:

* Ran ASCII scans across new and modified use-case source files; no non-ASCII characters were found.
* Ran CRLF scans across new and modified use-case source files; no CRLF line endings were found.
* Scanned high-risk copy terms for hosted overclaim, analytics, hosted forms, inbound command, team-management, ROI, and metrics contexts. Matches are explicit no-claim or boundary wording.
* Confirmed `public-website/src/data/use-cases.ts` has no numeric percentage or outcome metric claims.

**Files Changed**:

* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/tasks.md` - marked T023 complete and checked the completion checklist.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/implementation-notes.md` - recorded final guardrail scans.

**BQC Fixes**:

* Error information boundaries: final copy scan confirmed high-risk terms are used only for explicit boundaries and no-claim language.
* Contract alignment: final scans covered typed data, route files, and reusable components for the new use-case surface.

***

## Session Summary

* Completed 23 of 23 tasks.
* Added typed use-case route data, route constants, hub grid component, role-page component, hub route, and four role routes.
* Added Use Cases to primary/mobile navigation and aligned footer route links to constants.
* Fixed a build-blocking pre-existing `FeatureMatrix.astro` reserved key issue by restoring the quoted `"export"` key.
* Verification passed: package typecheck, static build, generated HTML inspection, Playwright desktop/tablet/mobile smoke, keyboard focus, mobile navigation focus restore, reduced-motion posture, ASCII, LF, and copy guardrail scans.

***

### Task T022 - Browser smoke use-case pages

**Started**: 2026-06-01 23:04 **Completed**: 2026-06-01 23:05 **Duration**: 1 minute

**Notes**:

* Started Astro preview for built output at `http://127.0.0.1:4322/`.
* Ran Playwright smoke across `/use-cases` and all four role routes at desktop `1440x1000`, tablet `768x1000`, and mobile `360x900`.
* Verified no horizontal overflow, CTA rows stay inside the viewport, hub role cards stack on 360px mobile, and role workflow comparison rows stack on 360px mobile.
* Verified desktop keyboard tab order reaches Use Cases navigation, external demo/docs actions, and supporting links.
* Verified mobile menu opens, focuses the first link, closes with Escape, and restores focus to the toggle.
* Verified reduced-motion media posture on a role page with no horizontal overflow.
* Reviewed representative screenshots in `/tmp/factionos-use-cases-smoke`.

**Files Changed**:

* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/tasks.md` - marked T022 complete.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/implementation-notes.md` - recorded smoke test evidence.

**BQC Fixes**:

* Accessibility and platform compliance: verified keyboard order, mobile menu focus management, external CTA reachability, and reduced-motion posture.
* Failure path completeness: smoke script fails on horizontal overflow, missing stacking behavior, or broken focus restoration.

***

### Task T021 - Run build and inspect generated use-case HTML

**Started**: 2026-06-01 23:03 **Completed**: 2026-06-01 23:04 **Duration**: 1 minute

**Notes**:

* Ran `npm --workspace @factionos/public-website run build`; the first run failed on an unrelated pre-existing syntax issue in `FeatureMatrix.astro`.
* Fixed the reserved `export` object key by restoring the quoted key form, then reran the build successfully.
* Confirmed Astro generated `/use-cases`, `/use-cases/engineering-teams`, `/use-cases/ai-platform-teams`, `/use-cases/founders`, and `/use-cases/power-users`.
* Verified each built use-case page contains canonical metadata, external demo link, external docs link, Use Cases navigation, and boundary copy.

**Files Changed**:

* `public-website/src/components/marketing/FeatureMatrix.astro` - restored quoted `"export"` workflow key so Astro/esbuild can build.
* `public-website/dist/use-cases/index.html` - generated by build.
* `public-website/dist/use-cases/engineering-teams/index.html` - generated by build.
* `public-website/dist/use-cases/ai-platform-teams/index.html` - generated by build.
* `public-website/dist/use-cases/founders/index.html` - generated by build.
* `public-website/dist/use-cases/power-users/index.html` - generated by build.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/tasks.md` - marked T021 complete.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/implementation-notes.md` - recorded build and HTML inspection.

**BQC Fixes**:

* Failure path completeness: resolved the build-blocking syntax error rather than deferring it.
* Contract alignment: built output confirms the hub and all role route paths produce static HTML with expected metadata and link targets.

***

## Blockers & Solutions

### Blocker 1: Astro build failed on FeatureMatrix reserved key

**Description**: The first static build failed before the new routes rendered because `FeatureMatrix.astro` had an unquoted `export` key in a `Record<FeatureWorkflow, string>` object. **Impact**: T021 build verification could not complete. **Resolution**: Restored the quoted `"export"` key form in `public-website/src/components/marketing/FeatureMatrix.astro` and reran the build successfully. **Time Lost**: 1 minute

***

## Design Decisions

### Decision 1: Keep role data and role sections centralized for this session

**Context**: The session explicitly asked for a typed `use-cases.ts` source of truth and a reusable `UseCaseRolePage.astro` component. Both files are larger than the preferred component size because they hold four role pages worth of static copy and scoped section CSS. **Options Considered**:

1. Split role copy and role sections into several smaller files now - clearer file sizes, but broader file surface and more moving parts during the first implementation.
2. Keep the specified files as the session-owned source of truth and schedule a split if future sessions add more roles or sections.

**Chosen**: Option 2. **Rationale**: The current shape keeps this session's contracts and route composition easy to audit. If another session adds roles, new proof sections, or more dense CSS, split role copy and role sections into smaller package-local modules before expanding these files further.

***

### Task T020 - Run package typecheck

**Started**: 2026-06-01 23:02 **Completed**: 2026-06-01 23:03 **Duration**: 1 minute

**Notes**:

* Ran `npm --workspace @factionos/public-website run typecheck`.
* Astro sync and `tsc --noEmit` completed successfully.

**Files Changed**:

* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/tasks.md` - marked T020 complete.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/implementation-notes.md` - recorded typecheck result.

**BQC Fixes**:

* Contract alignment: typecheck validates route metadata, component props, role keys, CTA keys, and exhaustive maps.

***

### Task T019 - Finalize responsive scoped CSS

**Started**: 2026-06-01 22:46 **Completed**: 2026-06-01 23:02 **Duration**: 16 minutes

**Notes**:

* Added responsive scoped CSS for hub hero, role cards, pain-point panels, role hero, workflow rows, surface cards, proof examples, and CTA rows.
* Removed viewport-scaled font sizing from the new use-case files and replaced it with stable rem sizes plus breakpoint overrides.
* Verified the new use-case CSS files typecheck, remain ASCII-only, and have no `font-size: clamp(...)` or `vw` usage.

**Files Changed**:

* `public-website/src/pages/use-cases/index.astro` - added and adjusted responsive hub hero CSS.
* `public-website/src/components/marketing/UseCaseGrid.astro` - added and adjusted responsive hub grid CSS.
* `public-website/src/components/marketing/UseCaseRolePage.astro` - added and adjusted responsive role-page CSS.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/tasks.md` - marked T019 complete.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/implementation-notes.md` - recorded responsive CSS completion.

**BQC Fixes**:

* Accessibility and platform compliance: preserved focus-visible states, reduced-motion handling, semantic section labels, and text labels for all status/tone uses.
* State freshness on re-entry: no interactive client state was added by these components.
* Contract alignment: responsive components still consume typed data and centralized route links.

***

### Task T018 - Populate power users data

**Started**: 2026-06-01 22:43 **Completed**: 2026-06-01 23:01 **Duration**: 18 minutes

**Notes**:

* Added power-user data covering local control, prompt lifecycle, approvals, replay, diagnostics, static demo exploration, proof examples, and demo/docs handoffs.
* Included explicit boundaries for local runtime behavior, static website behavior, and synthetic demo data.

**Files Changed**:

* `public-website/src/data/use-cases.ts` - populated power users role content.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/tasks.md` - marked T018 complete.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/implementation-notes.md` - recorded power-user data completion.

**BQC Fixes**:

* Error information boundaries: copy avoids workspace inspection, command execution, runtime socket, and default upload claims.
* Contract alignment: role content satisfies the typed `UseCaseRole` contract.

***

### Task T017 - Populate founders data

**Started**: 2026-06-01 22:43 **Completed**: 2026-06-01 23:00 **Duration**: 17 minutes

**Notes**:

* Added founder data covering multiple-agent control, product wedge clarity, zero-install synthetic demo exploration, docs handoff, proof examples, and CTAs.
* Kept founder copy concrete and avoided quantified productivity, traction, revenue, speed, or ROI claims.

**Files Changed**:

* `public-website/src/data/use-cases.ts` - populated founders role content.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/tasks.md` - marked T017 complete.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/implementation-notes.md` - recorded founder data completion.

**BQC Fixes**:

* Error information boundaries: copy frames demo exploration as synthetic and avoids metrics or ROI promises.
* Contract alignment: role content satisfies the typed `UseCaseRole` contract.

***

### Task T016 - Populate AI platform teams data

**Started**: 2026-06-01 22:43 **Completed**: 2026-06-01 22:59 **Duration**: 16 minutes

**Notes**:

* Added AI platform teams data covering provider-neutral hooks, protocol contracts, event visibility, diagnostics, outbound adapters, and guardrail-friendly integrations.
* Included role-specific links to how-it-works, docs, product, features, demo, and security handoffs.

**Files Changed**:

* `public-website/src/data/use-cases.ts` - populated AI platform teams role content.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/tasks.md` - marked T016 complete.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/implementation-notes.md` - recorded AI platform data completion.

**BQC Fixes**:

* Error information boundaries: adapter copy stays outbound-only and avoids inbound command, remote execution, analytics, and automatic upload claims.
* Contract alignment: role content satisfies the typed `UseCaseRole` contract.

***

### Task T015 - Populate engineering teams data

**Started**: 2026-06-01 22:43 **Completed**: 2026-06-01 22:58 **Duration**: 15 minutes

**Notes**:

* Added engineering teams data covering shared mission visibility, review context, parallel coordination, diagnostics, local privacy boundaries, proof examples, and role-specific CTAs.
* Included local-first guardrails for prompts, paths, credentials, source files, hosted team accounts, and optional War Room behavior.

**Files Changed**:

* `public-website/src/data/use-cases.ts` - populated engineering teams role content.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/tasks.md` - marked T015 complete.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/implementation-notes.md` - recorded engineering data completion.

**BQC Fixes**:

* Error information boundaries: copy keeps local privacy boundaries visible and avoids hosted team-management claims.
* Contract alignment: role content satisfies the typed `UseCaseRole` contract.

***

### Task T014 - Implement power users route

**Started**: 2026-06-01 22:53 **Completed**: 2026-06-01 22:57 **Duration**: 4 minutes

**Notes**:

* Added `/use-cases/power-users` with canonical metadata and `UseCaseRolePage` bound to typed power user role data.
* Role content covers local control, replay, prompt lifecycle visibility, approvals, diagnostics, and synthetic demo exploration.
* Package typecheck and ASCII scan passed with the route present.

**Files Changed**:

* `public-website/src/pages/use-cases/power-users.astro` - added power users route.
* `public-website/src/data/use-cases.ts` - provided power user role data consumed by the route.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/tasks.md` - marked T014 complete.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/implementation-notes.md` - recorded route implementation.

**BQC Fixes**:

* Error information boundaries: power-user copy states the public website cannot inspect workspaces, execute commands, connect to runtime sockets, or upload local state by default.
* Contract alignment: route uses `sitePaths.useCasesPowerUsers` and typed `getUseCaseRole("powerUsers")`.

***

### Task T013 - Implement founders route

**Started**: 2026-06-01 22:53 **Completed**: 2026-06-01 22:56 **Duration**: 3 minutes

**Notes**:

* Added `/use-cases/founders` with canonical metadata and `UseCaseRolePage` bound to typed founder role data.
* Role content covers multiple-agent control, product wedge clarity, synthetic demo exploration, docs handoff, and proof examples.
* Package typecheck and ASCII scan passed with the route present.

**Files Changed**:

* `public-website/src/pages/use-cases/founders.astro` - added founders route.
* `public-website/src/data/use-cases.ts` - provided founder role data consumed by the route.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/tasks.md` - marked T013 complete.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/implementation-notes.md` - recorded route implementation.

**BQC Fixes**:

* Error information boundaries: founder copy avoids ROI, revenue, adoption, speed, productivity, and traction metrics.
* Contract alignment: route uses `sitePaths.useCasesFounders` and typed `getUseCaseRole("founders")`.

***

### Task T012 - Implement AI platform teams route

**Started**: 2026-06-01 22:53 **Completed**: 2026-06-01 22:55 **Duration**: 2 minutes

**Notes**:

* Added `/use-cases/ai-platform-teams` with canonical metadata and `UseCaseRolePage` bound to typed AI platform role data.
* Role content covers protocol contracts, hooks, diagnostics, event visibility, optional outbound adapters, and integration guardrails.
* Package typecheck and ASCII scan passed with the route present.

**Files Changed**:

* `public-website/src/pages/use-cases/ai-platform-teams.astro` - added AI platform teams route.
* `public-website/src/data/use-cases.ts` - provided AI platform teams role data consumed by the route.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/tasks.md` - marked T012 complete.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/implementation-notes.md` - recorded route implementation.

**BQC Fixes**:

* Error information boundaries: adapter language stays outbound-only and avoids inbound command, analytics, or remote execution claims.
* Contract alignment: route uses `sitePaths.useCasesAiPlatformTeams` and typed `getUseCaseRole("aiPlatformTeams")`.

***

### Task T011 - Implement engineering teams route

**Started**: 2026-06-01 22:53 **Completed**: 2026-06-01 22:54 **Duration**: 1 minute

**Notes**:

* Added `/use-cases/engineering-teams` with canonical metadata and `UseCaseRolePage` bound to the typed engineering teams role data.
* Role data includes problem statement, before/after workflow, surfaces, proof examples, boundary notes, and CTAs focused on shared review context and local privacy.
* Package typecheck and ASCII scan passed with the route present.

**Files Changed**:

* `public-website/src/pages/use-cases/engineering-teams.astro` - added engineering teams route.
* `public-website/src/data/use-cases.ts` - provided engineering teams role data consumed by the route.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/tasks.md` - marked T011 complete.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/implementation-notes.md` - recorded route implementation.

**BQC Fixes**:

* Error information boundaries: engineering copy states no hosted organization, SSO, role management, or team-account claim.
* Contract alignment: route uses `sitePaths.useCasesEngineeringTeams` and typed `getUseCaseRole("engineeringTeams")`.

***

### Task T010 - Implement use-cases hub route

**Started**: 2026-06-01 22:52 **Completed**: 2026-06-01 22:53 **Duration**: 1 minute

**Notes**:

* Added `/use-cases` route with `BaseLayout`, `Shell`, canonical path, structured data, hero content, boundary badges, CTAs, supporting route links, and `UseCaseGrid`.
* Reused `useCaseHub`, `useCaseRouteLinks`, `sitePaths.useCases`, and `siteStructuredData`.
* Package typecheck and ASCII scan passed after adding the route.

**Files Changed**:

* `public-website/src/pages/use-cases/index.astro` - added use-case hub route.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/tasks.md` - marked T010 complete.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/implementation-notes.md` - recorded hub implementation.

**BQC Fixes**:

* Accessibility and platform compliance: hero uses labelled content, semantic CTAs, route nav labels, focus-visible link styles, and responsive button/card wrapping.
* Error information boundaries: static-site boundary copy is visible in the hero and grid sections.
* Contract alignment: route consumes centralized metadata, links, route constants, and structured data.

***

### Task T009 - Add Use Cases navigation

**Started**: 2026-06-01 22:51 **Completed**: 2026-06-01 22:52 **Duration**: 1 minute

**Notes**:

* Added "Use Cases" to `primaryNavigation`, which also flows into mobile navigation through `mobileUtilityLinks`.
* Replaced product, features, how-it-works, use-cases, security, contact, and legal navigation literals with `sitePaths` constants where available.
* Active-route behavior already treats child paths as active through prefix matching, so `/use-cases/*` will activate the Use Cases nav item.
* Package typecheck passed after navigation changes.

**Files Changed**:

* `public-website/src/data/navigation.ts` - added Use Cases primary/mobile link and aligned footer links to constants.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/tasks.md` - marked T009 complete.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/implementation-notes.md` - recorded navigation implementation.

**BQC Fixes**:

* Accessibility and platform compliance: retained existing header and mobile nav semantic link behavior, active route state, and external link labelling.
* Contract alignment: navigation now consumes `sitePaths.useCases` for the hub link.

***

### Task T008 - Add CTA and link helpers

**Started**: 2026-06-01 22:43 **Completed**: 2026-06-01 22:51 **Duration**: 8 minutes

**Notes**:

* Added `useCaseRouteLinks` for product, features, how-it-works, use-cases, security, demo, and docs handoffs.
* Added `getUseCaseLink`, `getUseCaseRole`, hub CTA keys, and per-role CTA definitions.
* Reused `siteExternalDestinations` for demo/docs external labels and aria labels instead of redefining external destinations.

**Files Changed**:

* `public-website/src/data/use-cases.ts` - added CTA/link helpers and role CTA data.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/tasks.md` - marked T008 complete.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/implementation-notes.md` - recorded CTA helper implementation.

**BQC Fixes**:

* Contract alignment: CTA keys are typed as internal or external link keys; invalid handoffs fail typecheck.
* Error information boundaries: CTA boundary copy distinguishes static routes, external demo/docs destinations, and no hosted account or analytics claims.

***

### Task T007 - Create reusable role-page component

**Started**: 2026-06-01 22:47 **Completed**: 2026-06-01 22:50 **Duration**: 3 minutes

**Notes**:

* Added `UseCaseRolePage.astro` to render role hero, problem statement, workflow rows, surface mappings, proof examples, guardrail notes, and CTA sections from typed role data.
* Included external/internal CTA handling through centralized `useCaseRouteLinks` and `ButtonLink`.
* Responsive CSS stacks workflows, comparison rows, cards, and CTA links at tablet and mobile widths.
* Package typecheck passed after adding the component.

**Files Changed**:

* `public-website/src/components/marketing/UseCaseRolePage.astro` - added reusable role-page component.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/tasks.md` - marked T007 complete.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/implementation-notes.md` - recorded component implementation.

**BQC Fixes**:

* Accessibility and platform compliance: used labelled sections, semantic headings, ordered workflow rows, descriptive link labels, and visible text labels for status and boundaries.
* Contract alignment: component consumes typed role data, link keys, availability maps, and tone maps instead of duplicating per-role route logic.
* Error information boundaries: role sections render explicit boundary and guardrail copy near workflows, surfaces, proof examples, and CTAs.

***

### Task T006 - Create accessible use-case grid

**Started**: 2026-06-01 22:46 **Completed**: 2026-06-01 22:47 **Duration**: 1 minute

**Notes**:

* Added `UseCaseGrid.astro` with shared pain-point panels, role route cards, and supporting route links.
* Role cards are semantic anchors with descriptive `aria-label` values, visible text labels, keyboard focus states, and reduced-motion handling.
* Responsive CSS uses stable grid tracks, mobile single-column fallbacks, `min-width: 0`, and `overflow-wrap` to avoid text overlap.
* Package typecheck passed after adding the component.

**Files Changed**:

* `public-website/src/components/marketing/UseCaseGrid.astro` - added accessible hub grid component.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/tasks.md` - marked T006 complete.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/implementation-notes.md` - recorded component implementation.

**BQC Fixes**:

* Accessibility and platform compliance: used semantic links, labelled sections, descriptive link labels, focus-visible states, and external-link screen reader text where needed.
* Contract alignment: component consumes typed use-case data and exhaustive tone labels instead of local path or role literals.
* State freshness on re-entry: no component-level client state was added, so there is no stale UI lifecycle state to reset.

***

### Task T005 - Add use-case route constants and canonical URLs

**Started**: 2026-06-01 22:43 **Completed**: 2026-06-01 22:46 **Duration**: 3 minutes

**Notes**:

* Added `sitePaths.useCases` plus role paths for engineering teams, AI platform teams, founders, and power users.
* Added matching `siteUrls` canonical URL constants for the hub and role routes.
* Wired `use-cases.ts` role route metadata through those constants instead of duplicating literal paths.

**Files Changed**:

* `public-website/src/data/site.ts` - added route path and canonical URL constants.
* `public-website/src/data/use-cases.ts` - consumed route constants for role paths and hub links.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/tasks.md` - marked T005 complete.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/implementation-notes.md` - recorded route constant implementation.

**BQC Fixes**:

* Contract alignment: centralized canonical path values so hub and role routes can reuse a single route source of truth.

***

### Task T004 - Define typed use-case data contract

**Started**: 2026-06-01 22:43 **Completed**: 2026-06-01 22:45 **Duration**: 2 minutes

**Notes**:

* Created `use-cases.ts` with typed role keys, link keys, shared pain points, role metadata, workflow rows, surface mappings, proof examples, CTAs, and boundary notes.
* Added exhaustive maps for tone labels and availability badge variants using `satisfies Record<...>`.
* Ran package typecheck after the data module and route constants were added; it passed.

**Files Changed**:

* `public-website/src/data/use-cases.ts` - added typed use-case source of truth.
* `public-website/src/data/site.ts` - added route constants needed by the typed data.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/tasks.md` - marked T004 complete.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/implementation-notes.md` - recorded data contract implementation.

**BQC Fixes**:

* Contract alignment: used typed route keys, role keys, link keys, and exhaustive `Record` maps so missing roles or availability states fail typecheck.
* Error information boundaries: included no-claim boundary copy around local state, demos, docs, adapters, credentials, prompts, paths, analytics, and hosted accounts.

***

### Task T003 - Confirm route constants and navigation reachability

**Started**: 2026-06-01 22:42 **Completed**: 2026-06-01 22:43 **Duration**: 1 minute

**Notes**:

* Confirmed `sitePaths` and `siteUrls` centralize internal route paths and canonical URLs, but use-case hub and role constants are missing.
* Confirmed `siteExternalDestinations.demo` and `siteExternalDestinations.docs` already provide external hrefs, descriptions, external labels, and aria labels for CTA reuse.
* Confirmed primary navigation can accept one concise "Use Cases" item before Security. Footer already includes a literal `/use-cases` link that should be aligned to route constants during navigation work.

**Files Changed**:

* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/tasks.md` - marked T003 complete.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/implementation-notes.md` - recorded route and navigation findings.

**BQC Fixes**:

* N/A - verification-only setup task.

***

### Task T002 - Review composition patterns

**Started**: 2026-06-01 22:41 **Completed**: 2026-06-01 22:42 **Duration**: 1 minute

**Notes**:

* Reviewed product route composition: `BaseLayout` metadata, `Shell activePath`, focused marketing components, and route data from `data/product.ts`.
* Reviewed features and how-it-works route patterns for hero sections, static boundary panels, CTA rows, supporting links, scoped responsive CSS, and reduced-motion handling.
* Reviewed layout and system primitives: `Section`, `Shell`, `ButtonLink`, `Badge`, `Panel`, and navigation components. New use-case routes should reuse those primitives and keep per-page CSS scoped.

**Files Changed**:

* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/tasks.md` - marked T002 complete.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/implementation-notes.md` - recorded route-composition review.

**BQC Fixes**:

* N/A - verification-only setup task.

***

### Task T001 - Verify public website prerequisites and route baseline

**Started**: 2026-06-01 22:40 **Completed**: 2026-06-01 22:41 **Duration**: 1 minute

**Notes**:

* Confirmed `@factionos/public-website` package scripts provide `dev`, `build`, `preview`, `astro`, and `typecheck`.
* Confirmed existing shipped routes include `/`, `/product`, `/features`, `/how-it-works`, `/blog`, `/news`, and RSS before adding `/use-cases`.
* Confirmed Phase 14 link targets for product, features, how-it-works, external demo, and external docs remain centralized. Existing planned trust links still point to future `/security` content.

**Files Changed**:

* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/tasks.md` - marked T001 complete.
* `.spec_system/specs/phase15-session01-use-cases-hub-and-role-pages/implementation-notes.md` - recorded prerequisite findings.

**BQC Fixes**:

* N/A - verification-only setup task.

***

## Task Log

### 2026-06-01 - Session Start

**Environment verified**:

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

***


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