docs(architecture): document CV builder, theme engine, Phase 4 status
cv-builder.md (variant model, rendering pipeline, API, builder workflow, extension points, known deep-link limitation) + cv-theme-engine.md (how a theme is data and how to add one). Roadmap Phase 4 marked foundation-shipped with the remaining polish itemised. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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# CV Builder (Career Workspace Builder)
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> Phase 4 (2026-07-18). The builder that turns the master career profile into themed, exportable,
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> optionally-public CVs. Companion to `docs/architecture/cv-theme-engine.md`,
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> `docs/architecture/career-profile-model.md`, and `MASTER_IMPLEMENTATION_GUIDE.md`. Verified against
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> code and a running container.
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## Source-of-truth chain
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```
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CareerProfile (the only editable career source)
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↓ read (never copied)
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CvVariant — a LENS: section order/visibility, per-item overrides, theme + builder settings
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↓ resolve
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CvRenderModel — presentation projection (CvVariantResolver)
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↓ render (one path, theme = data)
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HTML — ThemedCvRenderer
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↓ export / share
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PDF | Public CV (/cv/{slug})
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```
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The master profile is never written by the builder. A variant references career items by their stable
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`ItemKey`; overriding a bullet stores the override on the variant, leaving the profile untouched
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(`CvBuilderTests.Resolver_applies_item_override_bullets_without_touching_the_master`).
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## Variant model
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`CvVariant` (`Models/CvVariant.cs`) + `CvVariantVersion` (autosave history). The whole lens lives in one
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`SettingsJson` blob (`CvVariantSettings`, `Models/CvVariantSettings.cs`) because it is edited and saved
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as a unit — never queried field-by-field. A variant stores:
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- `ThemeId` + overrides: accent, heading/body font, density, page size, photo/icons/page-numbers.
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- `Sections`: ordered list with per-section `Hidden` + optional renamed `Title`.
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- `Overrides`: keyed by `ItemKey` → `{ Hidden, Title, Subtitle, Bullets }` (per-item, job-specific).
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- `CustomSections`: variant-only sections not in the master profile.
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`PublicSlug` (unguessable, globally unique) backs the public URL. `IsPublic` is off by default.
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## Rendering pipeline
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1. `CvVariantResolver.Build(profile, settings, fallbackName, photoDataUrl)` → `CvRenderModel`. Applies
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order, visibility, item overrides and custom sections. Pure projection, owns nothing.
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2. `ThemedCvRenderer.Render(model, theme, settings)` → HTML. One render path; the theme (data) drives
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layout/palette/typography/spacing. See `cv-theme-engine.md`.
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3. `PlaywrightCvPdfExporter` (reused unchanged) turns the HTML into a PDF.
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## API
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Authenticated (`/api/cv`, `CvVariantController`): `GET themes`; `GET/POST variants`;
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`GET/PUT/DELETE variants/{id}`; `POST variants/{id}/duplicate`; `PUT variants/{id}/public`;
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`GET variants/{id}/versions`, `POST …/versions/{v}/restore`; `GET variants/{id}/preview` and
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`POST preview` (live preview of unsaved settings); `POST variants/{id}/export-pdf`; `POST ai/assist`.
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Anonymous (`/api/public-cv/{slug}`, `PublicCvController`): serves a public variant read-only,
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`X-Robots-Tag: noindex`. Loads the owner's profile via `LoadStructuredForOwnerAsync` (bypasses the
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tenant filter — there is no current user). Unknown/private slug → 404
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(`CvBuilderTests.Private_variant_is_not_served_publicly`).
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## Builder workflow (frontend)
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`/career/builder` lists variants (`CvBuilderPage`); the editor (`CvBuilderEditor`) is three tabs —
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**Content**, **Customize**, **AI Tools** (plus **History**) — beside an always-on live preview that
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re-renders through `POST /api/cv/preview` on a 350 ms debounce. Edits autosave on an 800 ms debounce
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(`source: autosave`), appending a version each save. `/cv/:slug` (`PublicCvPage`) renders a public CV
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in a sandboxed iframe.
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## AI
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`POST /api/cv/ai/assist` reuses the existing `ISummarizerService` provider abstraction. It returns a
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suggestion the user copies in themselves — it never mutates the profile or the variant. Every prompt
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carries "preserve every factual claim — never invent" (MASTER_IMPLEMENTATION_GUIDE AI philosophy).
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## Extension points
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- **New theme**: append a `CvTheme` to the catalog (`cv-theme-engine.md`). No renderer change.
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- **New section kind**: add a builder in `CvVariantResolver` + a `Kind` branch in `ThemedCvRenderer`.
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- **DOCX export**: add an `IDocxExporter` consuming the same `CvRenderModel`; the model is format-neutral.
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- **Rich text / page numbers**: see `cv-theme-engine.md` "Deliberately not here (yet)".
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## Known limitation
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Direct external loads of any deep link (including `/cv/{slug}`) currently bounce to the app root — the
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CSR lift-and-shift Next.js static-export setup only prerenders `/`, so a hard navigation to a deep path
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doesn't reach the react-router route (in-app client navigation works). This affects the whole SPA, not
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just public CVs, but public CVs are the first feature that depends on external direct links working.
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Fix path: serve `index.html` for all non-`/api` paths so react-router owns routing (nginx already has
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`try_files $uri /index.html`; the redirect is client-side in the Next shell). Tracked as a follow-up —
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see `docs/architecture/frontend.md` / the Next.js migration note.
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