docs(examples): reorganise gallery by maturity tier (G2) (#87)

Wires up Track G2 from the v1.6.5→1.7 readiness taskboard.
examples/README.md previously grouped the 26 examples by the
GraphCompose release that introduced them (Built-in templates /
Cinematic v1.5 / v1.5 feature showcases / v1.6 feature showcases /
Public-API surface / Production patterns / Operational documents).
That layout is useful as a release history but unhelpful for someone
landing on the examples folder for the first time who needs to know
"which one do I read first" or "is this still recommended for new
code".

The gallery now categorises by maturity / intent, in five tiers with
the legend block introduced at the section header:

  🚀 Start here          — minimum-friction entry points
  🧱 Core DSL            — daily-driver features
  📋 Templates recommended — v2 / layered template surfaces
  🔧 Advanced SPI        — production patterns + specialty SPIs
  🗄️ Legacy              — pre-rebuild surface, do not start new code

Tier counts: 🚀 4 · 🧱 6 · 📋 4 · 🔧 8 · 🗄️ 4 = 26 examples
(unchanged from before — no examples added or removed).

All anchor IDs (#cv-single-template, #invoice-cinematic-v2, etc.)
are preserved verbatim, so existing deep links from the canonical
README, ADRs, and external sources continue to resolve. Only the
gallery index is restructured; the detailed sections below the
gallery are untouched.

The 🗄️ Legacy tier description links to docs/templates/which-template-system.md
(from G1) for the V1 → V2 migration path, so the two onboarding-clarity
PRs cross-link naturally.

Verification:
- ./mvnw -B -ntp test -pl . -Dtest='CanonicalSurfaceGuardTest,DocumentationCoverageTest,DocumentationExamplesTest,VersionConsistencyGuardTest'
  -> 30 tests, 0 failures
- ./mvnw -B -ntp -f examples/pom.xml clean compile
  -> BUILD SUCCESS (5.2s)

CHANGELOG entry added to v1.6.6 — Planned under the existing
### Documentation subsection (alongside the G1 entry).

Author: DemchaAV

CHANGELOG.md

@@ -52,6 +52,20 @@ JitPack continue to resolve through the existing coordinates.
   `GraphCompose.pdf(...)`, `PdfComposer`, etc. don't trip the
   legacy-token scan (same allowlist class as the v1.5 → v1.6 migration
   log already in there).
+- **`examples/README.md` reorganised by maturity** (Track G2). The
+  gallery section was grouped by the GraphCompose release that
+  introduced each example (Built-in templates / Cinematic v1.5 /
+  v1.5 feature showcases / v1.6 feature showcases / Public-API
+  surface / Production patterns / Operational documents) — useful
+  history for maintainers, less useful for someone landing on the
+  examples folder for the first time. The gallery now categorises
+  by maturity / intent: **🚀 Start here**, **🧱 Core DSL**,
+  **📋 Templates recommended**, **🔧 Advanced SPI**, **🗄️ Legacy**.
+  All 26 examples retained their anchor IDs, so existing deep links
+  continue to resolve; only the gallery index is restructured. A
+  maturity legend introduces the five tiers and links to
+  `docs/templates/which-template-system.md` for the V1 → V2 path that
+  the **Legacy** tier points at.
 
 ## v1.6.5 — 2026-05-30
 

examples/README.md

@@ -32,68 +32,69 @@ Then run all 26 examples in one shot:
 Generated PDFs land in `examples/target/generated-pdfs/`. The same
 `mvnw.cmd` form works on Windows PowerShell with backslash paths.
 
-## Gallery
+## Gallery — pick by your goal
 
-### Built-in document templates
+Examples are categorised by **maturity / intent**, not by the GraphCompose
+release that introduced them. Pick the row that matches how far along you
+are with the canonical DSL, then jump to its detailed section below.
 
-| Example | What it shows | Preview · Source |
-|---|---|---|
-| [Cover Letter](#cover-letter) | One-page `BusinessTheme.modern()` cover letter with section presets | [PDF](../assets/readme/examples/cover-letter.pdf) · [Source](src/main/java/com/demcha/examples/templates/coverletter/CoverLetterFileExample.java) |
-| [Invoice (V1)](#invoice-v1) | `InvoiceTemplateV1` driven from `InvoiceDocumentSpec` | [PDF](../assets/readme/examples/invoice.pdf) · [Source](src/main/java/com/demcha/examples/templates/invoice/InvoiceFileExample.java) |
-| [Proposal (V1)](#proposal-v1) | `ProposalTemplateV1` driven from `ProposalDocumentSpec` | [PDF](../assets/readme/examples/proposal.pdf) · [Source](src/main/java/com/demcha/examples/templates/proposal/ProposalFileExample.java) |
-| [Module-first Profile](#module-first-profile) | Authoring directly against `DocumentSession.module(...).paragraph(...)` | [PDF](../assets/readme/examples/module-first-profile.pdf) · [Source](src/main/java/com/demcha/examples/flagships/ModuleFirstFileExample.java) |
-| [CV — single template](#cv-single-template) | One CV via `ModernProfessional.create(BusinessTheme.modern())` (Templates v2) | [PDF](../assets/readme/examples/cv-modern-professional.pdf) · [Source](src/main/java/com/demcha/examples/templates/cv/CvFileExample.java) |
-| [CV — template gallery](#cv-template-gallery) | All 14 v2 CV presets in one orchestrated run | [Source](src/main/java/com/demcha/examples/templates/cv/CvTemplateGalleryFileExample.java) |
-| [Cover letter — template gallery](#cover-letter-template-gallery) | All 14 paired v2 cover-letter presets in one orchestrated run | [Source](src/main/java/com/demcha/examples/templates/coverletter/CoverLetterTemplateGalleryFileExample.java) |
-
-### Cinematic templates (v1.5)
-
-| Example | What it shows | Preview · Source |
-|---|---|---|
-| [Invoice — cinematic V2](#invoice-cinematic-v2) | `InvoiceTemplateV2 + BusinessTheme.modern()` | [PDF](../assets/readme/examples/invoice-cinematic.pdf) · [Source](src/main/java/com/demcha/examples/templates/invoice/InvoiceCinematicFileExample.java) |
-| [Proposal — cinematic V2](#proposal-cinematic-v2) | `ProposalTemplateV2 + BusinessTheme.modern()` | [PDF](../assets/readme/examples/proposal-cinematic.pdf) · [Source](src/main/java/com/demcha/examples/templates/proposal/ProposalCinematicFileExample.java) |
-| [Handcrafted Proposal](#handcrafted-proposal) | v1.4-style cinematic proposal composed by hand | [PDF](../assets/readme/examples/project-proposal-cinematic.pdf) · [Source](src/main/java/com/demcha/examples/templates/proposal/CinematicProposalFileExample.java) |
+> **Maturity legend.**
+> 🚀 **Start here** — minimum-friction entry points; pick one if you've never used the canonical DSL before.
+> 🧱 **Core DSL** — features you'll author against every day once the basics click.
+> 📋 **Templates recommended** — the v2 / layered template surfaces and how to drive them; pick when you want a one-line CV / invoice / proposal / cover-letter.
+> 🔧 **Advanced SPI** — production-deployment patterns, specialty SPIs (shapes, transforms, barcodes), engine-level tools (snapshots).
+> 🗄️ **Legacy** — pre-rebuild examples kept for downstream callers still on V1; do not start new code here. See [`docs/templates/which-template-system.md`](../docs/templates/which-template-system.md) for the V1 → V2 migration path.
 
-### v1.5 feature showcases
+### 🚀 Start here
 
 | Example | What it shows | Preview · Source |
 |---|---|---|
-| [Shape containers](#shape-containers) | Circles, ellipses, rounded cards with `ClipPolicy.CLIP_PATH` | [PDF](../assets/readme/examples/shape-container.pdf) · [Source](src/main/java/com/demcha/examples/features/shapes/ShapeContainerExample.java) |
-| [Transforms](#transforms) | `rotate`, `scale`, and per-layer `zIndex` swap | [PDF](../assets/readme/examples/transforms.pdf) · [Source](src/main/java/com/demcha/examples/features/transforms/TransformsExample.java) |
-| [Advanced tables](#advanced-tables) | Row span, zebra rows, totals, repeating header on page break | [PDF](../assets/readme/examples/table-advanced.pdf) · [Source](src/main/java/com/demcha/examples/features/tables/TableAdvancedExample.java) |
-| [Custom Business Theme](#custom-business-theme) | Hand-built `BusinessTheme` driving `InvoiceTemplateV2` | [PDF](../assets/readme/examples/invoice-custom-theme.pdf) · [Source](src/main/java/com/demcha/examples/features/themes/CustomBusinessThemeExample.java) |
+| [CV — single template](#cv-single-template) | One CV via `ModernProfessional.create(BusinessTheme.modern())` (Templates v2) | [PDF](../assets/readme/examples/cv-modern-professional.pdf) · [Source](src/main/java/com/demcha/examples/templates/cv/CvFileExample.java) |
+| [Invoice — cinematic V2](#invoice-cinematic-v2) | `InvoiceTemplateV2 + BusinessTheme.modern()` — the recommended invoice path | [PDF](../assets/readme/examples/invoice-cinematic.pdf) · [Source](src/main/java/com/demcha/examples/templates/invoice/InvoiceCinematicFileExample.java) |
+| [Cover Letter](#cover-letter) | One-page `BusinessTheme.modern()` cover letter with section presets | [PDF](../assets/readme/examples/cover-letter.pdf) · [Source](src/main/java/com/demcha/examples/templates/coverletter/CoverLetterFileExample.java) |
+| [Module-first Profile](#module-first-profile) | Authoring directly against `DocumentSession.module(...).paragraph(...)` — DSL-direct, no template | [PDF](../assets/readme/examples/module-first-profile.pdf) · [Source](src/main/java/com/demcha/examples/flagships/ModuleFirstFileExample.java) |
 
-### v1.6 feature showcases
+### 🧱 Core DSL
 
 | Example | What it shows | Preview · Source |
 |---|---|---|
+| [Rich text](#rich-text) | Every `RichText` method (bold / italic / underline / link / colour / accent / size / append) | [PDF](../assets/readme/examples/rich-text-showcase.pdf) · [Source](src/main/java/com/demcha/examples/features/text/RichTextShowcaseExample.java) |
+| [Section presets](#section-presets) | `pageBackground`, `band`, `softPanel`, `accentLeft / Right / Top / Bottom`, per-corner `DocumentCornerRadius` | [PDF](../assets/readme/examples/section-presets.pdf) · [Source](src/main/java/com/demcha/examples/features/text/SectionPresetsExample.java) |
 | [Nested lists](#nested-lists-v16) | `ListBuilder.addItem(label, Consumer)` — depth cascade, per-depth markers, mixed flat / nested authoring | [PDF](../assets/readme/examples/nested-list-showcase.pdf) · [Source](src/main/java/com/demcha/examples/features/lists/NestedListExample.java) |
 | [Composed table cells](#composed-table-cells-v16) | `DocumentTableCell.node(DocumentNode)` — paragraphs, lists, sub-tables inside cells with two-pass measurement | [PDF](../assets/readme/examples/composed-table-cell-showcase.pdf) · [Source](src/main/java/com/demcha/examples/features/tables/ComposedTableCellExample.java) |
 | [Canvas layer (free placement)](#canvas-layer-v16) | `CanvasLayerNode` — pixel-precise `(x, y)` placement of children inside a fixed bounding box, with `ClipPolicy` clipping | [PDF](../assets/readme/examples/canvas-layer-showcase.pdf) · [Source](src/main/java/com/demcha/examples/features/canvas/CanvasLayerExample.java) |
+| [Transforms](#transforms) | `rotate`, `scale`, and per-layer `zIndex` swap | [PDF](../assets/readme/examples/transforms.pdf) · [Source](src/main/java/com/demcha/examples/features/transforms/TransformsExample.java) |
 
-### Public-API surface
+### 📋 Templates recommended
 
 | Example | What it shows | Preview · Source |
 |---|---|---|
-| [Rich text](#rich-text) | Every `RichText` method (bold / italic / underline / link / colour / accent / size / link / append) | [PDF](../assets/readme/examples/rich-text-showcase.pdf) · [Source](src/main/java/com/demcha/examples/features/text/RichTextShowcaseExample.java) |
-| [Section presets](#section-presets) | `pageBackground`, `band`, `softPanel`, `accentLeft / Right / Top / Bottom`, per-corner `DocumentCornerRadius` | [PDF](../assets/readme/examples/section-presets.pdf) · [Source](src/main/java/com/demcha/examples/features/text/SectionPresetsExample.java) |
-| [Barcodes](#barcodes) | QR, Code 128, Code 39, EAN-13, EAN-8, branded QR with theme colours | [PDF](../assets/readme/examples/barcode-showcase.pdf) · [Source](src/main/java/com/demcha/examples/features/barcodes/BarcodeShowcaseExample.java) |
-| [PDF chrome](#pdf-chrome) | `DocumentMetadata`, `DocumentWatermark`, `DocumentHeaderFooter`, `DocumentBookmarkOptions` | [PDF](../assets/readme/examples/pdf-chrome.pdf) · [Source](src/main/java/com/demcha/examples/features/chrome/PdfChromeExample.java) |
+| [CV — template gallery](#cv-template-gallery) | All 14 v2 CV presets in one orchestrated run | [Source](src/main/java/com/demcha/examples/templates/cv/CvTemplateGalleryFileExample.java) |
+| [Cover letter — template gallery](#cover-letter-template-gallery) | All 14 paired v2 cover-letter presets in one orchestrated run | [Source](src/main/java/com/demcha/examples/templates/coverletter/CoverLetterTemplateGalleryFileExample.java) |
+| [Proposal — cinematic V2](#proposal-cinematic-v2) | `ProposalTemplateV2 + BusinessTheme.modern()` | [PDF](../assets/readme/examples/proposal-cinematic.pdf) · [Source](src/main/java/com/demcha/examples/templates/proposal/ProposalCinematicFileExample.java) |
+| [Custom Business Theme](#custom-business-theme) | Hand-built `BusinessTheme` driving `InvoiceTemplateV2` — theme-token customisation entry point | [PDF](../assets/readme/examples/invoice-custom-theme.pdf) · [Source](src/main/java/com/demcha/examples/features/themes/CustomBusinessThemeExample.java) |
 
-### Production patterns
+### 🔧 Advanced SPI
 
 | Example | What it shows | Preview · Source |
 |---|---|---|
+| [Shape containers](#shape-containers) | Circles, ellipses, rounded cards with `ClipPolicy.CLIP_PATH` | [PDF](../assets/readme/examples/shape-container.pdf) · [Source](src/main/java/com/demcha/examples/features/shapes/ShapeContainerExample.java) |
+| [Advanced tables](#advanced-tables) | Row span, zebra rows, totals, repeating header on page break | [PDF](../assets/readme/examples/table-advanced.pdf) · [Source](src/main/java/com/demcha/examples/features/tables/TableAdvancedExample.java) |
+| [Barcodes](#barcodes) | QR, Code 128, Code 39, EAN-13, EAN-8, branded QR with theme colours | [PDF](../assets/readme/examples/barcode-showcase.pdf) · [Source](src/main/java/com/demcha/examples/features/barcodes/BarcodeShowcaseExample.java) |
+| [PDF chrome](#pdf-chrome) | `DocumentMetadata`, `DocumentWatermark`, `DocumentHeaderFooter`, `DocumentBookmarkOptions` | [PDF](../assets/readme/examples/pdf-chrome.pdf) · [Source](src/main/java/com/demcha/examples/features/chrome/PdfChromeExample.java) |
 | [HTTP streaming](#http-streaming) | `writePdf(OutputStream)` for Servlet / S3 / GCS — caller's stream is not closed | [PDF](../assets/readme/examples/invoice-http-stream.pdf) · [Source](src/main/java/com/demcha/examples/features/streaming/HttpStreamingExample.java) |
-| [Layout snapshot regression](#layout-snapshot-regression) | Deterministic `layoutSnapshot()` workflow with baseline + drift report | [PDF](../assets/readme/examples/invoice-snapshot-regression.pdf) · [Source](src/main/java/com/demcha/examples/features/snapshots/LayoutSnapshotRegressionExample.java) |
+| [Layout snapshot regression](#layout-snapshot-regression) | Deterministic `layoutSnapshot()` workflow with baseline + drift report — production regression-testing pattern | [PDF](../assets/readme/examples/invoice-snapshot-regression.pdf) · [Source](src/main/java/com/demcha/examples/features/snapshots/LayoutSnapshotRegressionExample.java) |
+| [Business report cover](#business-report-cover) | Single-page Q1 investor brief — hero image, KPI cards, bar chart, metrics table | [PDF](../assets/readme/examples/business-report.pdf) · [Source](src/main/java/com/demcha/examples/flagships/BusinessReportExample.java) |
+| [Master showcase](#master-showcase) | Kitchen-sink "Q2 sample report" combining the canonical surface end-to-end | [PDF](../assets/readme/examples/master-showcase.pdf) · [Source](src/main/java/com/demcha/examples/flagships/MasterShowcaseExample.java) |
 
-### Operational documents
+### 🗄️ Legacy
 
 | Example | What it shows | Preview · Source |
 |---|---|---|
-| [Weekly schedule](#weekly-schedule) | Bar / restaurant shift schedule via reusable `WeeklyScheduleRenderer` with typed `DayShift` API | [PDF](../assets/readme/examples/weekly-schedule.pdf) · [Source](src/main/java/com/demcha/examples/templates/schedule/WeeklyScheduleFileExample.java) |
-| [Business report cover](#business-report-cover) | Single-page Q1 investor brief — hero image, KPI cards, bar chart, metrics table | [PDF](../assets/readme/examples/business-report.pdf) · [Source](src/main/java/com/demcha/examples/flagships/BusinessReportExample.java) |
-| [Master showcase](#master-showcase) | Kitchen-sink "Q2 sample report" combining the canonical surface end-to-end | [PDF](../assets/readme/examples/master-showcase.pdf) · [Source](src/main/java/com/demcha/examples/flagships/MasterShowcaseExample.java) |
+| [Invoice (V1)](#invoice-v1) | `InvoiceTemplateV1` driven from `InvoiceDocumentSpec` — pre-rebuild surface, supported only | [PDF](../assets/readme/examples/invoice.pdf) · [Source](src/main/java/com/demcha/examples/templates/invoice/InvoiceFileExample.java) |
+| [Proposal (V1)](#proposal-v1) | `ProposalTemplateV1` driven from `ProposalDocumentSpec` — pre-rebuild surface, supported only | [PDF](../assets/readme/examples/proposal.pdf) · [Source](src/main/java/com/demcha/examples/templates/proposal/ProposalFileExample.java) |
+| [Handcrafted Proposal](#handcrafted-proposal) | v1.4-style cinematic proposal composed by hand — pre-template authoring; kept for parity reference | [PDF](../assets/readme/examples/project-proposal-cinematic.pdf) · [Source](src/main/java/com/demcha/examples/templates/proposal/CinematicProposalFileExample.java) |
+| [Weekly schedule](#weekly-schedule) | Bar / restaurant shift schedule via `WeeklyScheduleRenderer` (`WeeklyScheduleTemplateV1` — no V2 yet; will be re-shaped before 2.0) | [PDF](../assets/readme/examples/weekly-schedule.pdf) · [Source](src/main/java/com/demcha/examples/templates/schedule/WeeklyScheduleFileExample.java) |
 
 ---