Name the frame's category for the decision, not the maths

`Attribute::Geometry` becomes `Attribute::Compose`, and `film_sim` moves
from `[tone, colour]` to `[effect]`.

Two categories were doing the wrong job. "Geometry" describes what crop,
straighten and the quarter turns do to coordinates — but it describes lens
distortion correction exactly as well, and that is not a compositional
choice at all. Naming the attribute for the photographer's decision is what
separates it from `Optics`: one is what the lens did, the other is what
they chose. The maths the two have in common is not the thing worth
filing them under.

A film stock declared both `tone` and `colour`, so "Kodachrome" appeared in
the Light group beside exposure and again in Colour beside white balance —
two places, neither of which is where anyone looks for it. It is neither:
`Effect` is defined in this same file as "applied rather than corrected — a
look, not a fix", which is what a stock is. That it moves tone and colour
is true of every look, and is not what the attribute is for.

`from_name` still accepts "geometry" on the way in. That string is
persisted in `develop.copy_attributes`, and an entry it fails to parse is
not an error — `presets::scope_for` logs it and drops it — so without the
alias an existing settings file would have quietly narrowed what a paste
carries. `name` writes the current spelling, so the file migrates itself
the first time it is saved.

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

docs/traceability.md

@@ -112,7 +112,7 @@ _None._
 | FR-PLAT-AND-6 | [`apps/darkroom-android/src/lib.rs:388`](../apps/darkroom-android/src/lib.rs#L388) |
 | FR-PLAT-LIN-1 | [`core/dr-types/src/settings.rs:1`](../core/dr-types/src/settings.rs#L1), [`platform/dr-plat/src/storage.rs:344`](../platform/dr-plat/src/storage.rs#L344), [`ui/dr-ui/src/lib.rs:999`](../ui/dr-ui/src/lib.rs#L999), [`ui/dr-ui/src/preset_store.rs:1`](../ui/dr-ui/src/preset_store.rs#L1), [`ui/dr-ui/src/settings_store.rs:1`](../ui/dr-ui/src/settings_store.rs#L1) |
 | FR-PLAT-LIN-2 | [`platform/dr-plat/src/display.rs:1`](../platform/dr-plat/src/display.rs#L1), [`platform/dr-plat/src/display/wayland.rs:1`](../platform/dr-plat/src/display/wayland.rs#L1), [`platform/dr-plat/src/display/x11.rs:1`](../platform/dr-plat/src/display/x11.rs#L1) |
-| FR-PLG-2 | [`core/dr-pipeline/src/declared/decl.rs:1`](../core/dr-pipeline/src/declared/decl.rs#L1), [`core/dr-pipeline/src/declared/expr.rs:152`](../core/dr-pipeline/src/declared/expr.rs#L152), [`core/dr-pipeline/src/declared/expr.rs:1`](../core/dr-pipeline/src/declared/expr.rs#L1), [`core/dr-pipeline/src/declared/mod.rs:1`](../core/dr-pipeline/src/declared/mod.rs#L1), [`core/dr-pipeline/src/declared/mod.rs:82`](../core/dr-pipeline/src/declared/mod.rs#L82), [`core/dr-pipeline/src/descriptor.rs:15`](../core/dr-pipeline/src/descriptor.rs#L15), [`core/dr-pipeline/src/descriptor.rs:652`](../core/dr-pipeline/src/descriptor.rs#L652), [`core/dr-pipeline/src/operation.rs:232`](../core/dr-pipeline/src/operation.rs#L232), [`core/dr-pipeline/tests/declared_parity.rs:1`](../core/dr-pipeline/tests/declared_parity.rs#L1), [`core/dr-pipeline/tests/declared_parity.rs:240`](../core/dr-pipeline/tests/declared_parity.rs#L240), [`core/dr-pipeline/tests/declared_parity.rs:305`](../core/dr-pipeline/tests/declared_parity.rs#L305), [`core/dr-pipeline/tests/declared_parity.rs:358`](../core/dr-pipeline/tests/declared_parity.rs#L358), [`core/dr-pipeline/tests/declared_parity.rs:416`](../core/dr-pipeline/tests/declared_parity.rs#L416) |
+| FR-PLG-2 | [`core/dr-pipeline/src/declared/decl.rs:1`](../core/dr-pipeline/src/declared/decl.rs#L1), [`core/dr-pipeline/src/declared/expr.rs:152`](../core/dr-pipeline/src/declared/expr.rs#L152), [`core/dr-pipeline/src/declared/expr.rs:1`](../core/dr-pipeline/src/declared/expr.rs#L1), [`core/dr-pipeline/src/declared/mod.rs:1`](../core/dr-pipeline/src/declared/mod.rs#L1), [`core/dr-pipeline/src/declared/mod.rs:82`](../core/dr-pipeline/src/declared/mod.rs#L82), [`core/dr-pipeline/src/descriptor.rs:15`](../core/dr-pipeline/src/descriptor.rs#L15), [`core/dr-pipeline/src/descriptor.rs:667`](../core/dr-pipeline/src/descriptor.rs#L667), [`core/dr-pipeline/src/operation.rs:232`](../core/dr-pipeline/src/operation.rs#L232), [`core/dr-pipeline/tests/declared_parity.rs:1`](../core/dr-pipeline/tests/declared_parity.rs#L1), [`core/dr-pipeline/tests/declared_parity.rs:240`](../core/dr-pipeline/tests/declared_parity.rs#L240), [`core/dr-pipeline/tests/declared_parity.rs:305`](../core/dr-pipeline/tests/declared_parity.rs#L305), [`core/dr-pipeline/tests/declared_parity.rs:358`](../core/dr-pipeline/tests/declared_parity.rs#L358), [`core/dr-pipeline/tests/declared_parity.rs:416`](../core/dr-pipeline/tests/declared_parity.rs#L416) |
 | FR-PLG-2d | [`core/dr-pipeline/src/declared/decl.rs:112`](../core/dr-pipeline/src/declared/decl.rs#L112), [`core/dr-pipeline/src/declared/decl.rs:152`](../core/dr-pipeline/src/declared/decl.rs#L152), [`core/dr-pipeline/src/declared/decl.rs:1`](../core/dr-pipeline/src/declared/decl.rs#L1), [`core/dr-pipeline/src/declared/decl.rs:420`](../core/dr-pipeline/src/declared/decl.rs#L420), [`core/dr-pipeline/src/declared/decl.rs:67`](../core/dr-pipeline/src/declared/decl.rs#L67), [`core/dr-pipeline/src/declared/mod.rs:1`](../core/dr-pipeline/src/declared/mod.rs#L1), [`core/dr-pipeline/src/declared/mod.rs:384`](../core/dr-pipeline/src/declared/mod.rs#L384), [`core/dr-pipeline/src/declared/mod.rs:403`](../core/dr-pipeline/src/declared/mod.rs#L403) |
 | FR-PLG-8 | [`core/dr-pipeline/src/sidecar.rs:1807`](../core/dr-pipeline/src/sidecar.rs#L1807), [`core/dr-pipeline/src/sidecar.rs:1840`](../core/dr-pipeline/src/sidecar.rs#L1840) |
 | FR-RAW-1 | [`core/dr-decode/src/lib.rs:243`](../core/dr-decode/src/lib.rs#L243), [`core/dr-types/src/lib.rs:132`](../core/dr-types/src/lib.rs#L132), [`core/dr-types/src/lib.rs:203`](../core/dr-types/src/lib.rs#L203) |