docs(vt): slice-1 contract — per-column list bindings per KB 08 §3; .af is the only meta/nav store

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

docs/plans/2026-09-06-campaign-vt-slice1-files-and-columns.md

@@ -51,10 +51,13 @@ lists in each `C*`/`A*`/`N*` class's `ImportFromMetAF`/`ExportToMetAF` pair
 (py:6727-11821); nav node lines `<flw|pnt|prt|rcl|pau|cht|vnd|ptl|tlk|chk|jmp> x y z args`
 (py:10728-11821); nested `All`/`Any`/`Not`/`DoAll` by indentation exactly as
 metaf emits and accepts them; embedded navs inside `EmbedNav`. Load into the
-existing `Meta`/`Navigation` models (replacing `VtankMetaProfileSerializer`
-and `VtankNavRouteSerializer` as the profile-store format; keep the binary
-readers only if a test still needs them — delete otherwise, with their
-tests), save back as `.af` that metaf itself accepts. Proof: (1) every
+existing `Meta`/`Navigation` models. `.af` becomes the ONLY storage and
+authoring format of the meta and route profile stores. The existing binary
+`VtankMetaProfileSerializer`/`VtankNavRouteSerializer` are demoted to a
+one-shot import (`.met`/`.nav` → model → saved as `.af`); their `Save`
+writers and writer tests are deleted (lead's call under the owner's "do not
+implement .met" direction — flagged in the closeout for the owner). Save
+back as `.af` that metaf itself accepts. Proof: (1) every
 `.af` under `metas/af/` parses; (2) parse → write → parse is identical;
 (3) for the `met/` and `nav/` samples, our model loaded from metaf's own
 `.af` conversion equals our model loaded from the matching `.af` in `af/`
@@ -74,17 +77,21 @@ to fail first.
 Oracle: `docs/research/vtank-kb/08-ui-views.md` §2-3 (VVS `HudList`
 semantics and the proposed extension), `docs/plugin-ui-markup.md`.
 
-B1. Markup: `<list>` accepts child `<column type="text|check|icon"
-header="…" width="…" [name] />` elements. Without columns the element is
-unchanged (single text column, existing bindings). With columns: `rows`
-binds an `IEnumerable<PluginListRow>`-shaped contract in
-`AcDream.Plugin.Abstractions` (BCL-only: a row = ordered cells; cell = text
-string, bool check, or uint icon id with `iconkind` per column), `selected`
-/`onchange` as today, plus `oncell="{Action<int,int>}"` (row, column) fired
-on a click inside a cell, and check columns toggling through
-`oncheck="{Action<int,int,bool>}"`. Header row optional (`headers="true"`),
-per-column widths in px with the last column absorbing the remainder,
-horizontal clipping per cell, scrolling as today.
+B1. Markup, exactly doc 08 §3's proposal: `<list>` accepts child
+`<column type="text|check|icon" width="…" [iconkind] [colors]/>` elements,
+each binding its own per-row source parallel to the row count (per-attribute
+binding like every other element; no new `Plugin.Abstractions` type):
+`items="{IReadOnlyList<string>}"` for text, `values="{IReadOnlyList<bool>}"`
++ `onchange="{Action<int>}"` (row index; the plugin flips its own bool) for
+check, `values="{IReadOnlyList<uint>}"` + `iconkind` + `onclick="{Action<int>}"`
+for icon. Row count = the longest bound column; short columns draw empty
+cells. The list's own `selected`/`onchange` stay as today; a click in a
+check/icon column fires that column's callback and does NOT change
+selection; a click in a text column selects. No header row (VTank's idiom
+is `<label>`s above the list; document it). Per-column widths in px, the
+last column absorbs the remainder, per-cell horizontal clipping, scrolling
+as today. Without `<column>` children the element is byte-for-byte the old
+single-column list (existing `items`/`icons`/`colors` attributes unchanged).
 B2. Widget: extend `UiMarkupList` (or a sibling) — draw header, per-cell
 text/check/icon, hit-test to (row, column), keyboard-free. Icons through the
 existing `IMarkupIconResolver` with the column's `iconkind`.