chore(skill): Own tttk-authoring in the repo

Move the skill to .agents/skills/tttk-authoring and point gen:skill-reference at it. Activate it by symlinking ~/.agents/skills/tttk-authoring to the in-repo copy.

Extend the reference drift guard to cover the skill copy now that it is versioned, and document activation in docs/development.md.

.agents/skills/tttk-authoring/SKILL.md

@@ -0,0 +1,138 @@
+---
+name: tttk-authoring
+description: Author and edit TTRPG game design documents for the tttk (Tabletop Toolkit) CLI. Use when writing or modifying markdown content that uses tttk custom elements (:md-dice, :md-table, :md-deck, :md-pins, :md-commander, etc.), custom fenced code blocks (role=spark-table / declare / file / tag), companion CSV data files, or when previewing content with `tttk serve` and validating it with `tttk check`.
+---
+
+# Authoring tttk game design documents
+
+`tttk` (Tabletop Toolkit) renders a folder of markdown into an interactive TTRPG
+web app. A game design document is **ordinary GFM markdown** plus exactly two
+extensions:
+
+1. **Custom elements** written with `marked-directive` syntax: `:name[content]{attrs}`.
+2. **Custom fenced code blocks** whose info string carries a `role=` attribute.
+
+Everything else — headings, lists, tables, blockquotes, alerts, mermaid — is
+standard markdown. Do not invent element names, props, or roles; check
+`reference.md` when unsure. Deeper topics have their own files: `yaml-tag.md`
+(deck config), `csv.md` (data files), `layout.md` (columns), and `markdown.md`
+(alerts and mermaid).
+
+## Workflow
+
+- Content lives in a directory (commonly `content/`). Preview with hot reload:
+  `npx tttk serve ./content` (default port 3000, override with `-p 8080`).
+- **Validate after every edit:** `npx tttk check ./content`. It exits `1` when
+  there are errors and prints `file:line` diagnostics. Use `--json` for
+  machine-readable output and `--quiet` for errors only. This is the primary
+  verification loop: write → check → fix.
+- The scanner picks up `.md`, `.csv`, `.yarn`, and `.svg` files.
+- All paths in directives are **relative to the current markdown file**
+  (`./data.csv`, `../shared/npcs.csv`, `./images/map.png`).
+- A typical game/adventure folder:
+  ```
+  my-adventure/
+  ├── design.md        # design notes (plain markdown)
+  ├── adventure.md     # the document players/GM read
+  ├── locations.csv    # data referenced by :md-table
+  ├── cast.csv
+  └── route.csv
+  ```
+
+## Directive syntax
+
+```
+:name[content]{key="value" .class #id}
+```
+
+- `[content]` is the directive body — a path, dice formula, color, etc.
+- `{key="value"}` sets attributes. `{.class}` and `{#id}` are shorthands.
+- Container directives use `::: name` … `:::`; nest deeper with `::::`, `:::::`.
+
+Use the **registered element names**: `:md-dice`, not `:dice`. The full list is
+in `reference.md`.
+
+## Code block roles
+
+Fenced blocks are dispatched by the `role=` attribute in the info string:
+
+| Info string | Behavior |
+|---|---|
+| ` ```csv role=spark-table ` | Body is CSV; replaced with `:md-table[./csv_<hash>]`. First column header must be a dice formula (`d6`, `2d6+1`, …). |
+| ` ```markdown role=spark-table ` | Body is a GFM pipe table; converted to CSV, then same as above. |
+| ` ```csv role=declare ` | Defines reactive variables / tag modifiers. Block is stripped. |
+| ` ```<lang> role=file ` | Body stored as text content, block stripped, referenced by its derived id. |
+| ` ```yaml role=tag ` | Kept intact; rendered as a custom element from YAML (`tag:`, `body:`, …). |
+| ` ```<lang> ` (no role) | Rendered as a normal visible code block. |
+| unknown role | Warned about and stripped. |
+
+## Rules that prevent broken output
+
+- Quote any attribute value containing spaces or `"`:
+  `{pins="A:30,40 B:10,30"}`.
+- In CSV, wrap fields containing `,`, `"`, or a newline in double quotes and
+  escape `"` as `""`. Lines starting with `#` are comments.
+- `label` and `body` are the conventional CSV columns. Put titles inside `body`
+  as markdown headings; use **bold labels** for sub-fields, not headings.
+- A `group` column in a table CSV automatically produces group tabs — no
+  attribute needed.
+- Reference each CSV once per document; don't repeat the same `:md-table`.
+- For card decks, use the `yaml role=tag` form with `tag: md-deck` (see
+  `yaml-tag.md`). The `:md-deck[...]{...}` directive is legacy and can't express
+  template layers or card backs.
+- Keep CSV files clean — header row plus data. Put deck config and templates in
+  the YAML block's `data-config`, not in CSV front matter (see `csv.md`).
+- `{{prop}}` in a CSV `body` interpolates another column (or front-matter key)
+  from the same row; with `{remix}` it pulls from a random row instead.
+
+## Validation
+
+`npx tttk check ./content` validates against the same content registry the app
+uses, so a clean check means the app resolves the content too. Errors exit `1`:
+
+| Code | Meaning |
+|---|---|
+| `TTTK-S002` | container directive `:::` never closed |
+| `TTTK-D001` | unknown `:md-*` element name |
+| `TTTK-D002` | malformed attribute block (e.g. an unquoted value with a space) |
+| `TTTK-R001` | unknown code-block `role=` (the block is silently dropped) |
+| `TTTK-R003` | `role=declare` failed to parse |
+| `TTTK-R005` | `role=tag` YAML is invalid |
+| `TTTK-R006` | `role=tag` missing or naming an unknown element |
+| `TTTK-C001` | content reference does not resolve |
+| `TTTK-C004` | `:md-embed` cycle |
+| `TTTK-L001` | link target file does not exist |
+| `TTTK-V001` | CSV failed to parse (e.g. an unclosed quote) |
+
+Warnings are usually real too:
+
+| Code | Meaning |
+|---|---|
+| `TTTK-R002` | spark-table first header is not a dice formula |
+| `TTTK-R004` | `role=declare` row skipped (empty `key` or `expr`) |
+| `TTTK-C002` | reference resolves to an unexpected file type |
+| `TTTK-L002` | `#section` matches no heading |
+| `TTTK-A001` | icon missing under `assets/` |
+| `TTTK-A002` | image missing |
+| `TTTK-V002` | CSV row column count differs from the header |
+| `TTTK-V003` | duplicate `label` values |
+| `TTTK-V004` | `{{prop}}` is not a CSV column or front-matter key |
+| `TTTK-V005` | spark-table roll value is not a number or range |
+
+`TTTK-C003` (info) flags the same CSV referenced twice by `:md-table` in one
+document. Icon checks assume no `assets/` directory exists above the checked
+directory. The full code catalog lives in `reference.md`.
+
+## Reference
+
+- `reference.md` — **generated** catalog of every custom element, inline
+  directive, code block role, and dice notation. Do not edit by hand;
+  regenerate from the repo with `npm run gen:skill-reference`.
+- `yaml-tag.md` — `role=tag` blocks, `data-config` layers, card backs, and the
+  legacy `:md-deck` layer syntax.
+- `csv.md` — CSV authoring: columns, `{{prop}}` interpolation, quoting, and the
+  discouraged front-matter form.
+- `layout.md` — column layout markers.
+- `markdown.md` — GitHub alerts and mermaid diagrams.
+- `examples/adventure.md` and `examples/encounters.csv` — a complete minimal
+  document and its data file.

.agents/skills/tttk-authoring/csv.md

@@ -0,0 +1,42 @@
+# CSV data files
+
+**Keep CSV files clean** — a header row and data rows, nothing else. Put deck
+configuration and templates in the `yaml role=tag` block's `data-config`, not in
+the CSV. This keeps data portable and presentation in one place. See
+`reference.md` for the element and role catalog.
+
+```csv
+label,body,name,type
+1,"### 火球术卷轴
+
+一张泛黄的羊皮纸。",火球术卷轴,消耗品
+```
+
+- `label` — unique row id (number or text).
+- `body` — main content, supports markdown.
+- Any other columns are custom fields.
+- `{{prop}}` in `body` interpolates another column from the same row (or a
+  random row when the table uses `{remix}`).
+- Wrap values containing `,`, `"`, or newlines in double quotes; escape `"` as
+  `""`. Lines beginning with `#` are comments.
+
+## Front matter (avoid)
+
+The parser also accepts YAML front matter delimited by `---`, which can declare
+`fields`, a `deck:` block, and arbitrary keys merged into every row. **Prefer
+not to use it** — it mixes presentation into the data file. Use the YAML tag
+block instead.
+
+```csv
+---
+fields:
+  - name: name
+    description: 卡牌名称
+deck:
+  size: 63x88
+  grid: 5x5
+game_system: D&D 5e
+---
+label,body,name,type
+1,"### 火球术卷轴",火球术卷轴,消耗品
+```

.agents/skills/tttk-authoring/examples/adventure.md

@@ -0,0 +1,68 @@
+# The Hollow Mill
+
+## Adventure brief
+
+The mill on the village edge has stood silent for a year. Last week its wheel
+began turning again — on its own.
+
+> [!WARNING]
+> The mill's guardian is not hostile by default. Attacking it forfeits the
+> peaceful resolution.
+
+## Locations
+
+:md-table[./locations.csv]
+
+## Random encounters
+
+:md-table[./encounters.csv]{roll=true}
+
+## The mill guardian
+
+:md-dice[1d20+3]{key="guardian-attack"}
+
+The guardian strikes with :[sword] for :md-dice[2d6+2]{key="guardian-damage"}.
+
+## Encounter table (inline)
+
+```csv role=spark-table roll=true
+d6,Encounter
+1,A crow watches from the rafters.
+2,The floorboards groan underfoot.
+3,A cold draft carries the smell of grain.
+4,The wheel outside stops for one breath.
+5,A sack of flour splits open.
+6,The guardian's lantern flickers to life.
+```
+
+## Route
+
+```mermaid
+graph TD
+    A[Village] --> B[Mill Road]
+    B --> C{Mill Door}
+    C -->|Force| D[Ground Floor]
+    C -->|Listen| E[Secret Cellar]
+    D --> F[Wheel Room]
+    E --> F
+```
+
+## Guardian card
+
+```yaml role=tag
+tag: md-deck
+body: ./guardian.csv
+data-config:
+  size: 63x88
+  grid: 5x5
+  layers:
+    - prop: name
+      pos: 1,1-5,1
+      font: 12
+    - template: |
+        **{{type}}** — {{hp}} HP
+        {{description}}
+      pos: 1,3-5,8
+      font: 3
+      align: l
+```

.agents/skills/tttk-authoring/examples/encounters.csv

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+group,label,body
+Mill Road,1,"### A crow on the fence
+
+A crow fixes you with one eye, then flies toward the mill.
+
+**Interaction**: Follow it (Perception 3/1)
+
+**Risk**: None"
+Mill Road,2,"### Broken cart
+
+An overturned cart blocks half the road.
+
+**Interaction**: Clear it (Strength 3/2)
+
+**Risk**: Failure costs 1 Stamina"
+Mill Road,3,"### Cold spot
+
+The air turns suddenly cold.
+
+**Interaction**: Press on (Constitution 3/1)
+
+**Risk**: Failure deals 1 Constitution damage"
+Wheel Room,1,"### The turning wheel
+
+The wheel grinds without water.
+
+**Interaction**: Jam the gears (Strength 3/3)
+
+**Risk**: Failure deals 1 Agility damage"
+Wheel Room,2,"### Flour dust
+
+Thick dust fills the air.
+
+**Interaction**: Cover your mouth (Constitution 3/1)
+
+**Risk**: Failure deals 1 Constitution damage"

.agents/skills/tttk-authoring/examples/guardian.csv

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+label,name,type,hp,description
+1,The Hollow Miller,Spirit,10,"Bound to the wheel by an old promise. Speaks only in the sound of grinding stone."

.agents/skills/tttk-authoring/examples/locations.csv

@@ -0,0 +1,47 @@
+label,body
+Village,"### Village
+
+**Type**: Starting location
+
+A quiet village at the edge of the marsh. The miller's daughter asks after her
+father.
+
+**Interaction**: Ask about the mill (Charisma 3/1)
+
+**Supplies**: Rope, torches, one healing draught"
+Mill Road,"### Mill Road
+
+**Type**: Route
+
+A muddy track winding between hedgerows toward the mill.
+
+**Interaction**: Spot tracks (Perception 3/1)
+
+**Encounters**: 3 random encounters"
+Ground Floor,"### Ground Floor
+
+**Type**: Hub
+
+Sacks of grain, a cold hearth, and a ladder to the wheel room.
+
+**Interaction**:
+- Search the hearth (Perception 3/2) — find a brass key
+- Climb the ladder (Agility 3/1)"
+Secret Cellar,"### Secret Cellar
+
+**Type**: Archive
+
+A low cellar beneath the millstones. Ledgers line the walls.
+
+**Interaction**: Read the ledgers (Intelligence 3/2) — learn the guardian's name
+
+**Clue**: The last entry is dated one year ago, in the miller's hand"
+Wheel Room,"### Wheel Room
+
+**Type**: Finale
+
+The great wheel turns in silence, though no water reaches it.
+
+**Interaction**:
+- Speak the guardian's name (Charisma 3/3) — peaceful resolution
+- Break the wheel (Strength 3/4) — hostile resolution"

.agents/skills/tttk-authoring/layout.md

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+# Column layout
+
+Wrap content in columns using line markers. This is a tttk extension on top of
+standard markdown; see `reference.md` for the element and role catalog.
+
+```markdown
+|---
+Left column
+-|-
+Right column
+--|
+```
+
+| Marker | Meaning |
+|---|---|
+| `\|---` | Start the column container |
+| `-\|-` | Divider between columns |
+| `--\|` | End the container |
+
+Extra dashes add a `-N` class suffix (e.g. `-|--` → `col-2`) for custom widths.

.agents/skills/tttk-authoring/markdown.md

@@ -0,0 +1,39 @@
+# Alerts and mermaid
+
+Standard markdown features that `tttk` renders. They are not tttk syntax — see
+`reference.md` for the element and role catalog.
+
+## GitHub-style alerts
+
+```markdown
+> [!NOTE]
+> 这是一条备注
+
+> [!TIP]
+> 提示内容
+
+> [!IMPORTANT]
+> 重要信息
+
+> [!WARNING]
+> 警告信息
+
+> [!CAUTION]
+> 危险警告
+```
+
+## Mermaid diagrams
+
+Fenced `mermaid` blocks render as diagrams:
+
+````markdown
+```mermaid
+graph TD
+    A[开始] --> B{选择}
+    B -->|选项 1| C[结果 1]
+    B -->|选项 2| D[结果 2]
+```
+````
+
+Supported: flowchart, sequenceDiagram, classDiagram, stateDiagram, erDiagram,
+pie.

.agents/skills/tttk-authoring/reference.md

@@ -0,0 +1,365 @@
+# tttk syntax reference
+
+Generated from `src/cli/validate/known.ts` by `npm run gen:reference`.
+Do not edit by hand.
+
+Complete catalog of the custom elements, inline directives, and code block
+roles that `tttk` understands. Everything not listed here is standard GFM
+markdown. Element names are prefixed `md-` and must match exactly.
+
+## Contents
+
+- [Directive syntax](#directive-syntax)
+- [Custom elements](#custom-elements)
+- [Inline directives](#inline-directives)
+- [Code block roles](#code-block-roles)
+- [Dice notation](#dice-notation)
+- [CSV data files](#csv-data-files)
+
+## Directive syntax
+
+```text
+:name[content]{key="value" .class #id}
+```
+
+| Part | Meaning | Example |
+|---|---|---|
+| `:name` | Registered element name | `:md-dice` |
+| `[content]` | Directive body | `[2d6+d8]` |
+| `{attrs}` | Attributes | `{key="attack"}` |
+| `{.class}` | Shorthand for `class` | `{.text-red-500}` |
+| `{#id}` | Shorthand for `id` | `{#my-dice}` |
+
+Container directives:
+
+```markdown
+::: container
+Content here, including nested directives.
+:dice[1d20]
+:::
+```
+
+Nest with more colons (`::::`, `:::::`).
+
+## Custom elements
+
+| Directive | Body | Key attributes |
+|---|---|---|
+| `:md-dice` | dice formula | `key` |
+| `:md-table` | CSV path or inline id | `roll`, `remix` |
+| `:md-deck` | CSV path | `size`, `grid`, `layers` |
+| `:md-link` | path, optional #section | — |
+| `:md-embed` | path, optional #section | `headingBase` |
+| `:md-bg` | image path or CSS color | `fit` |
+| `:md-border` | color or border image | `width`, `slice` |
+| `:md-font` | font family | `source`, `weight`, `color` |
+| `:md-pins` | image path | `pins`, `fixed`, `labelStart` |
+| `:md-commander` | command template CSV | `placeholder`, `class`, `height` |
+| `:md-yarn-spinner` | Yarn Spinner file | `start` |
+
+### `:md-dice`
+
+Clickable dice roller; `key` stores the result in the URL.
+
+Clicking the text rolls; clicking the 🎲 resets to the formula. With `key`, the result is stored in the URL as `?dice-<key>=<value>`.
+
+- Body: dice formula
+- Attributes: `key`
+
+```markdown
+:md-dice[1d20+5]{key="attack"}
+```
+
+```markdown
+:md-dice[2d6+3]
+```
+
+```markdown
+:md-dice[3d6kh1]
+```
+
+### `:md-table`
+
+Tab-separated view of a CSV with optional group tabs.
+
+`roll` adds a 🎲 random-tab button; `remix` makes `{{prop}}` references pull from a random row. A `group` column in the CSV produces group tabs automatically.
+
+- Body: CSV path or inline id
+- Attributes: `roll`, `remix`
+
+```markdown
+:md-table[./npcs.csv]
+```
+
+```markdown
+:md-table[./encounters.csv]{roll=true}
+```
+
+```markdown
+:md-table[./quests.csv]{roll=true remix=true}
+```
+
+### `:md-deck`
+
+Card layout from a CSV (legacy; prefer `yaml role=tag`).
+
+Prefer the `yaml role=tag` form — it is the only form that supports template layers, per-layer alignment, and card backs. The directive form is legacy and only supports the compact `layers` string.
+
+- Body: CSV path
+- Attributes: `size`, `grid`, `layers`
+
+```markdown
+:md-deck[./cards.csv]{size="63x88" grid="5x5" layers="title:1,1-5,1f8 body:1,5-5,8f3"}
+```
+
+### `:md-link`
+
+Clickable link that expands the target article inline.
+
+- Body: path, optional #section
+
+```markdown
+:md-link[./rules.md]
+```
+
+```markdown
+:md-link[./rules.md#combat]
+```
+
+### `:md-embed`
+
+Renders the target article or section inline.
+
+`headingBase` shifts the heading levels of the embedded content.
+
+- Body: path, optional #section
+- Attributes: `headingBase`
+
+```markdown
+:md-embed[./rules.md#combat]{headingBase=1}
+```
+
+### `:md-bg`
+
+Sets the surrounding article card background.
+
+`fit` is one of `cover` (default), `contain`, `fill`, `none`, `scale-down`.
+
+- Body: image path or CSS color
+- Attributes: `fit`
+- Body may also be a CSS color (e.g. `#2a1a3a`, `crimson`).
+
+```markdown
+:md-bg[./images/dungeon-bg.jpg]{fit="cover"}
+```
+
+```markdown
+:md-bg[#2a1a3a]
+```
+
+### `:md-border`
+
+Applies a border to the article card.
+
+Body is a CSS color or a border-image path. Class flags select sides (`t b l r all`), style (`solid dashed dotted double groove ridge inset outset none`), and image repeat (`stretch repeat round space`).
+
+- Body: color or border image
+- Attributes: `width`, `slice`
+- Body may also be a CSS color (e.g. `#2a1a3a`, `crimson`).
+
+```markdown
+:md-border[crimson]{.b}
+```
+
+```markdown
+:md-border[./frame.png]{width="2mm" slice="10" .all.round}
+```
+
+### `:md-font`
+
+Sets the article font.
+
+`source` is `google`, `emfont`, or `local` (default).
+
+- Body: font family
+- Attributes: `source`, `weight`, `color`
+
+```markdown
+:md-font[Noto Sans SC]{source="google" weight="700" color="#1a1a2e"}
+```
+
+### `:md-pins`
+
+Numbered markers on an image.
+
+`pins` is a space-separated list of `label:x,y` (percent coordinates). `fixed` makes it read-only; otherwise click to add and click a pin to remove. `labelStart` sets the first label (letter or number).
+
+- Body: image path
+- Attributes: `pins`, `fixed`, `labelStart`
+
+```markdown
+:md-pins[./images/battle-map.png]{pins="A:25,50 B:75,30 C:50,80" fixed}
+```
+
+```markdown
+:md-pins[./images/dungeon.png]{labelStart="1"}
+```
+
+### `:md-commander`
+
+Interactive command history / tracker panel.
+
+The body is a CSV of command templates (`command,parameter,label,description,insertedText`).
+
+- Body: command template CSV
+- Attributes: `placeholder`, `class`, `height`
+
+```markdown
+:md-commander[./commands.csv]{placeholder="输入命令…" height="400px"}
+```
+
+### `:md-yarn-spinner`
+
+Runs a Yarn Spinner dialogue file.
+
+`start` names the entry node (default `start`).
+
+- Body: Yarn Spinner file
+- Attributes: `start`
+
+```markdown
+:md-yarn-spinner[./story.yarn]{start="start"}
+```
+
+## Inline directives
+
+### `:[name]`
+
+Inserts an icon looked up under `assets/` (searching upward from the file).
+
+Default extension is `.png`; `.svg`, `.gif`, `.jpg`, `.jpeg`, and `.webp` are also supported. `label` overlays text, `repeat` duplicates N times, and `join` places a tag name between repeats.
+
+- Body: icon name
+- Attributes: `label`, `repeat`, `join`, `class`
+
+```markdown
+:[attack]  :[shield.svg]  :[potion]
+```
+
+```markdown
+:[attack]{label=ATK repeat=3 join=br}
+```
+
+### `:cmd[command]`
+
+Renders a clickable span that dispatches a journal command.
+
+- Body: journal command
+- Attributes: `label`
+
+```markdown
+:cmd[roll 1d20+5]{label=Roll initiative}
+```
+
+```markdown
+:cmd[spark dungeon room-type]{label=Random room}
+```
+
+## Code block roles
+
+The `role=` attribute on the info string determines how a fenced block is
+handled.
+
+### `role=spark-table`
+
+CSV (or markdown pipe table) rendered as `:md-table`.
+
+The first column header must be a dice formula; each row's first cell is the roll value (a number, or a range like `1-3`). Extra fence attributes are forwarded to the generated `:md-table`, e.g. ` ```csv role=spark-table roll=true `.
+
+````markdown
+```csv role=spark-table
+d6,结果
+1,遭遇强盗
+2,平安无事
+```
+````
+
+````markdown
+```markdown role=spark-table
+| d6 | 结果 |
+|----|------|
+| 1  | 遭遇强盗 |
+| 2  | 平安无事 |
+```
+````
+
+### `role=declare`
+
+Reactive variable / tag-modifier definitions.
+
+Columns (any order): `tag`, `threshold`, `key`, `expr`. A row with an empty `tag` declares a variable; a row with a `#tag` applies a modifier when that tag is active.
+
+````markdown
+```csv role=declare
+tag,threshold,key,expr
+,,$hp,$con*5+$mod_hp
+#warrior,2,$mod_hp,20
+```
+````
+
+### `role=file`
+
+Stored as inline text content and stripped.
+
+Referenced by the derived inline id, e.g. `:md-embed[./text_<hash>]`.
+
+````markdown
+```text role=file
+Stored as inline content.
+```
+````
+
+### `role=tag`
+
+YAML rendered as a custom element.
+
+`tag:` names the element, `body:` becomes its content, and any other key becomes an attribute. Fence-line attributes override the YAML body. See `yaml-tag.md`.
+
+````markdown
+```yaml role=tag
+tag: md-deck
+body: ./cards.csv
+size: 63x88
+grid: 5x5
+```
+````
+
+### No role / unknown role
+
+No role → a normal visible code block. Unknown role → warned about and
+stripped.
+
+## Dice notation
+
+Used by `:md-dice`, spark-table headers, and the journal `/roll`:
+
+| Notation | Meaning |
+|---|---|
+| `2d6` | two six-sided dice |
+| `1d20+5` | d20 plus modifier |
+| `3d6kh1` | keep highest 1 |
+| `3d6dl2-1` | drop lowest 2, minus 1 |
+| `{d4, d8}` | choose one of the listed dice |
+
+## CSV data files
+
+Keep CSV files clean — a header row and data rows. Put deck configuration
+and templates in a `yaml role=tag` block's `data-config`.
+
+- `label` — unique row id (number or text).
+- `body` — main content, supports markdown.
+- Any other columns are custom fields.
+- `{{prop}}` in `body` interpolates another column (or front-matter key)
+  from the same row; with `{remix}` it pulls from a random row.
+- Wrap values containing `,`, `"`, or newlines in double quotes; escape
+  `"` as `""`. Lines beginning with `#` are comments.

.agents/skills/tttk-authoring/yaml-tag.md

@@ -0,0 +1,66 @@
+# YAML tag blocks
+
+`` ```yaml role=tag `` renders a custom element from YAML. `tag` names the
+element, `body` becomes its content, and any other key becomes an attribute.
+Fence-line attributes override the YAML body. See `reference.md` for the
+element and role catalog.
+
+````markdown
+```yaml role=tag
+tag: md-deck
+body: ./cards.csv
+data-config:
+  size: 63x88
+  grid: 5x5
+  layers:
+    - prop: title
+      pos: 1,1-5,1
+      font: 12
+    - template: |
+        **{{name}}** — {{type}}
+        {{description}}
+      pos: 1,3-5,8
+      font: 3
+      align: l
+```
+````
+
+Simple cases can stay on the fence line:
+
+````markdown
+```yaml role=tag tag=md-dice body=3d6
+```
+````
+
+## `data-config` layers
+
+Layers accept:
+
+- `prop` — read a CSV column, or `template` — markdown with `{{var}}`
+  substitution.
+- `pos` — `x1,y1-x2,y2` grid span (1-based).
+- `font` / `fontSize` — font size in mm.
+- `orientation` — `n` / `s` / `e` / `w`.
+- `align` — `l` / `c` / `r`, optionally prefixed `t` / `b`.
+- `visible` — show or hide the layer.
+
+Use `back_layers` for card backs.
+
+## Legacy `:md-deck` directive
+
+`:md-deck[./cards.csv]{...}` still works but is **legacy** — prefer the YAML tag
+block above. It only supports the compact `layers` string and cannot express
+template layers or backs.
+
+```markdown
+:md-deck[./cards.csv]{size="63x88" grid="5x5" layers="title:1,1-5,1f8 body:1,5-5,8f3"}
+```
+
+Compact layer syntax: `prop:x1,y1-x2,y2[f<size>][nsew][[t|b]lcr]`
+
+- `prop` — CSV column to render.
+- `x1,y1-x2,y2` — grid span (1-based).
+- `f<size>` — font size in mm, e.g. `f8`.
+- `nsew` — text orientation (default `n`).
+- `l` / `c` / `r` — horizontal align, optionally prefixed `t` / `b` for vertical
+  (`tl`, `bc`, …).