docs(design): automated parameters read live instead of drawing their lane

An earlier pass drew each automation lane's envelope shape inside its module.
Dropped: the lane already has a home in the timeline, and a second small
drawing of it in the rack is decoration. What the rack is actually missing is
the CURRENT value.

The panel already receives that — FxSectionProps.liveAutomationValues exists
because "an automated parameter's stored number is only the seed the lane
replaced, so a rack that shows it stands still while the carve is audibly
working". So an automated row is now an ordinary parameter row whose number is
live at the playhead, marked `~` to say it is driven rather than set, with the
marker moving with it. Stopped, the values go grey and hold.

Better on its own terms and cheaper to build: no new drawing, and it consumes
a prop that already exists for exactly this.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: vanceingalls

plans/audio-fx-presets.md

@@ -315,12 +315,23 @@ quietest, which matters on a surface authors stare at while mixing.
 | Numbered nodes 01…06 | implicit top-to-bottom order |
 | Bypassed node: ring drawn open, wire beside it solid and unbroken | a row at 50% opacity |
 | Preset nodes gathered under a right-hand brace with its name | no grouping at all |
-| An automated parameter draws its lane shape; the value column reads `lane` | a stale number the lane already replaced |
+| An automated parameter's value reads **live at the playhead** and ticks while the transport runs, marked `~` | the stale seed the lane already replaced |
 | A measuring module gets a second ring | nothing distinguishes carve from a hand-set chain |
 
 That last pair is the static-versus-script distinction from §4, delivered as
 drawing rather than documentation.
 
+**Automated parameters show numbers, not shapes.** An earlier pass drew each
+lane's envelope inside the module; that was dropped. The lane already has a home
+in the timeline, and a second small drawing of it in the rack is decoration —
+what the rack is missing is the *current* value. The panel already receives it:
+`FxSectionProps.liveAutomationValues` exists precisely because "an automated
+parameter's stored number is only the seed the lane replaced, so a rack that
+shows it stands still while the carve is audibly working". So the row is an
+ordinary parameter row whose number is live, `~` on the label saying it is
+driven rather than set, and the marker moving with it. Stopped, the values go
+grey and hold at the playhead.
+
 **The preset menu preview is the chain** — each row previews the nodes it will
 draw as small connected rings in their family colours, so the shape you pick is
 the shape you get. Smart entries read `MEASURES` instead.