CultPhasor rename: README, design note and both changelogs

cultmath-unity [Unreleased] and cultlib [Unreleased] carry the Breaking entries; no version bump, no tag.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/cultmath/docs/design.md

@@ -429,7 +429,7 @@ together, laid out as `float4(gradient.xyz, value.w)`, with no value-only twin
 - `phacelle(float3 p, float3 side, float offset, float normalization)` is Rune
   Skovbo Johansen's Phacelle noise ("phase + cell": a stripe pattern built by
   blending one cosine/sine wave per jittered cell), generalised to 3D cells. It
-  returns `CultPhasor { cos, sin }`, each `(∇, value)`. `side` is the stripe
+  returns `CultPhasor { cosine, sine }`, each `(∇, value)`. `side` is the stripe
   wave vector, whose length is 2π times the stripe frequency; in 3D the
   perpendicular to the flow is not unique, so the caller chooses it (on a unit
   sphere, `cross(p̂, flow)`). `offset` is the phase in cycles. It visits 4×4×4

packages/cultmath/unity/org.gamecult.cultmath/CHANGELOG.md

@@ -5,6 +5,15 @@ All notable changes to this package are documented in this file.
 Earlier releases (0.2.0-0.2.3) predate this package's changelog and are not
 backfilled here; see `docs/semver-policy.md` for why.
 
+## [Unreleased]
+
+### Breaking
+
+- `CultPhasor.cos` and `.sin` are now `.cosine` and `.sine` in C#, HLSL and GLSL,
+  constructor parameters included, because SPIRV-Cross renames members that match
+  GLSL builtins. This is a minor bump on 0.y.z, so the next cultmath-unity release
+  is 0.5.0.
+
 ## [0.4.1]
 
 ### Fixed

src/GameCult.Caching.MessagePack/README.md

@@ -101,7 +101,7 @@ broken graph whole (an `ExprGraphException` naming the rule), so a consumer
 | `float2x2`, `float3x3` | array of row vectors (row-major) | array of row objects |
 | `rect` | `[min, max]` of `float2` | `{"min":{..},"max":{..}}` |
 | `CultCellular` | `[nearest, edge, id]` | `{"nearest":{..},"edge":{..},"id":..}` |
-| `CultPhasor` | `[cos, sin]` of `float4` | `{"cos":{..},"sin":{..}}` |
+| `CultPhasor` | `[cosine, sine]` of `float4` | `{"cosine":{..},"sine":{..}}` (reads legacy `cos`/`sin`) |
 | `CultSiteCells` | `[nearest, second, nearestSite, secondSite]` | `{"nearest":{..},"second":{..},"nearestSite":..,"secondSite":..}` |
 
 Floats are MessagePack float32 (`0xCA`), doubles float64 (`0xCB`), integers the

unity/org.gamecult.cultlib/CHANGELOG.md

@@ -6,6 +6,10 @@ All notable changes to this package are documented in this file.
 
 ### Breaking
 
+- `CultMathJson` writes `CultPhasor` as `{"cosine":..,"sine":..}` and still reads
+  the old `cos`/`sin` keys. A reader from before this change skips the new keys
+  and decodes zeros, so upgrade readers before writers. MessagePack bytes are
+  unchanged.
 - CultCache refuses an unknown union arm on read and an unnamed union subtype on
   write. A payload whose arm key the union does not declare used to decode to
   `null` (and the next save wrote the loss back); a value whose type the union