docs: the pane plates' style parameters and the relief config shape

A new section ahead of "The network plate is optional": every plate the
designer draws is the toolkit's pane material, what the style.surface
block looks like after the 2026-09-28 consolidation (one roll width,
relief { wall … ; edge … } with light as the strength key, cce-relief's
knobs in its own state file, one frost spelling), the two keys that look
like they apply and do not, and where the network pane's second layer
gets its fill. Also corrects the menu-plate paragraph: the menu block is
set in the shared config.kdl, there being no per-app
cce-designer/config.kdl on the machine.

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

 CLAUDE.md | 91 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 88 insertions(+), 3 deletions(-)

diff --git a/CLAUDE.md b/CLAUDE.md
index 6dcb5fa..caf6044 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -1178,6 +1178,89 @@ the sheet survives.
 everything-at-once node, is deliberately not ported: it is these four chained,
 and that collapse is the whole premise of "fifty operators, ten nodes".
 
+### The pane plates: one material, one relief block
+
+Every plate the designer draws — the network panel, params, spreadsheet,
+playbar, page pane, and every collapsed stub — goes through
+`append_widget_plate_radii` in `render.rs`, and every one of those widgets
+answers `color()` with `cce_ui::colors::param_plate_fill`, which is
+`Material::pane()`: the toolkit's PANE rung. So there is ONE material for
+the designer's plates, configured in the `style.surface` block of
+`~/.config/cce/config.kdl` (a `~/.config/cce/cce-designer/config.kdl`
+merges over it key by key, when one exists), and the network plate and the
+params plate cannot be styled apart short of binding a named material
+(`plate material="…"`). The viewport has no plate of its own: its lip is the
+window's root-plate edge. What the block looks like after the 2026-09-28
+consolidation, and what each key is:
+
+```kdl
+style {
+    surface {
+        plate bevel_width=(f64)12.0 {           // bevel_width: a RETIRED override, see below
+            pane color=(rgba)"#6c6c7bf2"         // the tint, alpha = strength (legacy: param.color × plate_opacity)
+            frost radius=(f64)5.5 compression=(f64)0.0 refraction=(f64)0.0   // the one frost spelling
+            border_color (rgba)"#9595a9ff"        // the flat border, relief OFF only
+            border_thickness (f64)1.0
+            root { corner_radius (i64)24 }        // the pane corner radius falls back to this
+        }
+        relief light=(f64)0.15 width=(f64)9.3 {  // light: strength, NOT a length; width: the one roll/wall run
+            wall height=(mm)0.3 profile="smooth;…"   // a carve's wall: buttons, wells, param rows
+            edge height=4.0    profile="smooth;…"   // a plate's perimeter roll: these panes
+        }
+        menu color=(rgba)"#101018ff"             // the dialog and every context menu (below)
+    }
+}
+```
+
+The rules that took a day to settle, each with the wrong version it replaced:
+
+- **One roll width.** `relief.width` is the run of every roll and wall: the
+  root plate, a `PlateSpec` pane plate, these bordered widget plates (through
+  `colors::plate_bevel_width`), every control wall, and the length
+  `edge.height` is a rise against. Until 2026-09-28 the widget-plate path
+  had `style.surface.plate.bevel_width` of its own (default 6 against the
+  relief's 9.3), so the panes here and the window lip rolled over different
+  widths and no single key made them match. The old key survives as an
+  explicit override, reported once at load, unit-blind.
+- **Wall and edge are two shapes, and the config names them.** A wall is
+  shaded as a translucent overlay on what is under it; an edge multiplies
+  the plate's own fill and adds a specular crest. Each node carries
+  `height` (a length — the wall's drop, the roll's rise; unset = follow the
+  width) and `profile` (a ramp spec; absent = the analytic curve). The flat
+  spellings (`height` / `profile` for the wall, `edge_height` /
+  `edge_profile`) are aliases, and the node spelling wins when a file
+  carries both. `light` is the spelling of the strength; `depth` is its
+  alias, losing the same way.
+- **cce-relief's knobs are not a style key.** The Shoulder / Base / Bias
+  triples behind each profile (`wall.knobs` / `edge.knobs`, before that
+  `profile_knobs` / `edge_knobs`) were editor state beside the values that
+  draw; they live in `~/.config/cce/cce-relief/state.kdl`, one node per
+  Save target. A config still carrying one seeds the editor once, and its
+  next Save takes the key off.
+- **Frost is one block, and the flat keys are retired.** `plate.blur`,
+  `.radius`, `.backdrop_compression` and `.refraction` are reported by path
+  at load and not read — `blur=true` alone is a SHARP plate, and the warning
+  is what says why. A named material's `frost` child spells its knob
+  `compression` too.
+- **Focus is the bevel's tint.** With relief on (`window_manager.control_relief`,
+  default on), a plated pane marks focus by tinting its roll with
+  `highlight_primary_color` (`plate_focus_tint`); the flat `border_color`
+  draws only with relief off.
+
+Two keys look like they apply and do not: `style.surface.plate.color`
+feeds `plate_color`, whose one consumer is the info box, and the finish's
+spec / shininess / curvature live as `relief.spec` / `.shininess` /
+`.curvature`, not under `plate`. The network pane is two layers: the
+`PassivePlate` above and the Graph on top with its own `style.surface.graph`
+fill (`cell_color`, `gap_color`, `opacity`, `blur`, `uniform_background`),
+nearly transparent by default so the lattice you see is the pane plate
+showing through — the next section is about dropping that plate entirely.
+The params widget alone also reads `style.surface.param.backdrop_compression`.
+The rules live in cce-ui's CLAUDE.md ("There is one roll width", "The
+relief is two shapes", "Frost is one block"); this is the designer's view of
+them, written because the question "what are the style parameters of the
+plates" took a session to answer from the code.
+
 ### The network plate is optional
 
 The network pane can drop its PLATE — the filled, frosted surface its graph
@@ -1915,9 +1998,11 @@ function the context menus draw theirs with: `Material::menu` — the
 absent, the root plate colour as menus always wore), `opacity` and
 `compression` — on `menu.corner_radius` with the relief-width roll. So
 the command palette, the Add Node list and every right-click menu are
-configured in ONE block and cannot be configured apart; the designer's
-per-app config.kdl sets that block to the look the dialog had
-(`#101018` at 0.06, compression 0.8, radius 24). Until then the dialog
+configured in ONE block and cannot be configured apart; the shared
+config.kdl's `menu color=(rgba)"#101018ff"` sets that block to the look the
+dialog had (there is no per-app `cce-designer/config.kdl` on the machine as
+of 2026-09-28 — only `.bak` copies — so the main file is where it is set).
+Until then the dialog
 was the parameter plate's fill under a compression of its own
 (`DIALOG_COMPRESSION` 0.8, `style.surface.dialog.compression`) — an
 in-app override the menus did not share, and the reason the two plates