docs(canon): register weft->spline + the joinery naming system

Adds weft -> spline to the deprecated-names table (like 6a2 -> descriptiles):
the data-form layer of the joinery system (cleave=surface, groove=protocol,
spline=data-form). Renamed from textile "weft" to fit the carpentry metaphor;
consumers (gossamer, burble) sit outside and keep their own names. Anchors the
canon estate-wide so it isn't normalised back. See groove ADR 0009.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

CANONICAL-NAMES.adoc

@@ -112,6 +112,14 @@ estate-wide, `standards` included.
 | The normative verb family (Must/Trust/Adjust/Dust/Bust/Intend). Not a rename
   — named here as the established companion of `descriptiles`, so the
   `descriptiles`/`contractiles` pair is stated together as canonical.
+
+| **`weft`**
+| **`spline`**
+| The data-form / wire layer of the *joinery* system: `cleave` (the surface),
+  `groove` (the protocol), `spline` (the data-form that seats into a groove).
+  Renamed from `weft` (textile) to fit the carpentry metaphor. Consumers
+  (`gossamer`, `burble`, …) sit outside the system and keep their own names.
+  See groove ADR 0009. Do not revert `spline`→`weft`.
 |===
 
 == Adding a name