Prove on a device that the profile reaches the screen

The unit tests either side of the base curve check halves — that the shipped
database parses and lifts its midtones, and that the generated WGSL evaluates
a curve in the right place. Neither would notice if the two agreed with each
other and both were wrong: a curve packed into the wrong uniform slots, or a
flag read from the wrong component, satisfies both and renders nothing.

So render real pixels. A flat frame through a neutral edit, once with the
Canon EOS 6D's curve looked up by name from the YAML and once with the
identity, asserting what a base curve is actually for — midtones lifted,
black still black, white still white, monotone the whole way — plus the
number an unprofiled body must still produce, so "never worse than today"
is a value rather than a promise.

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

docs/traceability.md

@@ -9,8 +9,8 @@ Denominators are parsed from [`requirements.md`](requirements.md) at run time, n
 
 | Metric | Value |
 |---|---|
-| Source files scanned | 151 |
-| TRACES tags found | 370 |
+| Source files scanned | 152 |
+| TRACES tags found | 371 |
 | Requirements defined | 151 |
 | Requirements covered | 83 |
 | **Coverage** | **55.0%** (83/151) |
@@ -54,7 +54,7 @@ _None._
 | FR-DEV-3b | [`core/dr-pipeline/src/descriptor.rs:177`](../core/dr-pipeline/src/descriptor.rs#L177), [`core/dr-pipeline/src/framing.rs:257`](../core/dr-pipeline/src/framing.rs#L257), [`core/dr-pipeline/src/graph.rs:54`](../core/dr-pipeline/src/graph.rs#L54), [`core/dr-pipeline/src/operation.rs:107`](../core/dr-pipeline/src/operation.rs#L107) |
 | FR-DEV-3c | [`core/dr-pipeline/build.rs:1804`](../core/dr-pipeline/build.rs#L1804), [`core/dr-pipeline/ops/exposure.yaml:1`](../core/dr-pipeline/ops/exposure.yaml#L1), [`core/dr-pipeline/src/graph.rs:163`](../core/dr-pipeline/src/graph.rs#L163), [`core/dr-pipeline/src/graph.rs:41`](../core/dr-pipeline/src/graph.rs#L41), [`core/dr-pipeline/src/mask.rs:490`](../core/dr-pipeline/src/mask.rs#L490), [`ui/dr-ui/src/develop.rs:2579`](../ui/dr-ui/src/develop.rs#L2579) |
 | FR-DEV-3d | [`core/dr-pipeline/src/framing.rs:186`](../core/dr-pipeline/src/framing.rs#L186) |
-| FR-DEV-3e | [`core/dr-decode/src/base_curve.rs:145`](../core/dr-decode/src/base_curve.rs#L145), [`core/dr-decode/src/base_curve.rs:158`](../core/dr-decode/src/base_curve.rs#L158), [`core/dr-decode/src/base_curve.rs:1`](../core/dr-decode/src/base_curve.rs#L1), [`core/dr-decode/src/base_curve.rs:267`](../core/dr-decode/src/base_curve.rs#L267), [`core/dr-decode/src/base_curve.rs:347`](../core/dr-decode/src/base_curve.rs#L347), [`core/dr-decode/src/base_curve.rs:55`](../core/dr-decode/src/base_curve.rs#L55), [`core/dr-decode/src/lib.rs:100`](../core/dr-decode/src/lib.rs#L100), [`core/dr-decode/src/lib.rs:632`](../core/dr-decode/src/lib.rs#L632), [`core/dr-decode/src/lib.rs:672`](../core/dr-decode/src/lib.rs#L672), [`core/dr-decode/src/profile.rs:102`](../core/dr-decode/src/profile.rs#L102), [`core/dr-decode/src/profile.rs:151`](../core/dr-decode/src/profile.rs#L151), [`core/dr-decode/src/profile.rs:1`](../core/dr-decode/src/profile.rs#L1), [`core/dr-decode/src/profile.rs:235`](../core/dr-decode/src/profile.rs#L235), [`core/dr-decode/src/profile.rs:286`](../core/dr-decode/src/profile.rs#L286), [`core/dr-decode/src/profile.rs:343`](../core/dr-decode/src/profile.rs#L343), [`core/dr-decode/src/profile.rs:458`](../core/dr-decode/src/profile.rs#L458), [`core/dr-decode/src/profile.rs:492`](../core/dr-decode/src/profile.rs#L492), [`core/dr-decode/src/profile.rs:630`](../core/dr-decode/src/profile.rs#L630), [`core/dr-gpu/src/adjust.rs:345`](../core/dr-gpu/src/adjust.rs#L345), [`core/dr-gpu/src/adjust.rs:35`](../core/dr-gpu/src/adjust.rs#L35), [`core/dr-gpu/src/demosaic.rs:121`](../core/dr-gpu/src/demosaic.rs#L121), [`core/dr-gpu/src/demosaic.rs:86`](../core/dr-gpu/src/demosaic.rs#L86), [`core/dr-pipeline/src/operation.rs:1079`](../core/dr-pipeline/src/operation.rs#L1079), [`core/dr-pipeline/src/operation.rs:1104`](../core/dr-pipeline/src/operation.rs#L1104), [`core/dr-pipeline/src/operation.rs:1119`](../core/dr-pipeline/src/operation.rs#L1119), [`core/dr-pipeline/src/operation.rs:1140`](../core/dr-pipeline/src/operation.rs#L1140), [`core/dr-pipeline/src/operation.rs:154`](../core/dr-pipeline/src/operation.rs#L154), [`core/dr-pipeline/src/operation.rs:164`](../core/dr-pipeline/src/operation.rs#L164), [`core/dr-pipeline/src/operation.rs:277`](../core/dr-pipeline/src/operation.rs#L277) |
+| FR-DEV-3e | [`core/dr-decode/src/base_curve.rs:145`](../core/dr-decode/src/base_curve.rs#L145), [`core/dr-decode/src/base_curve.rs:158`](../core/dr-decode/src/base_curve.rs#L158), [`core/dr-decode/src/base_curve.rs:1`](../core/dr-decode/src/base_curve.rs#L1), [`core/dr-decode/src/base_curve.rs:267`](../core/dr-decode/src/base_curve.rs#L267), [`core/dr-decode/src/base_curve.rs:347`](../core/dr-decode/src/base_curve.rs#L347), [`core/dr-decode/src/base_curve.rs:55`](../core/dr-decode/src/base_curve.rs#L55), [`core/dr-decode/src/lib.rs:100`](../core/dr-decode/src/lib.rs#L100), [`core/dr-decode/src/lib.rs:632`](../core/dr-decode/src/lib.rs#L632), [`core/dr-decode/src/lib.rs:672`](../core/dr-decode/src/lib.rs#L672), [`core/dr-decode/src/profile.rs:102`](../core/dr-decode/src/profile.rs#L102), [`core/dr-decode/src/profile.rs:151`](../core/dr-decode/src/profile.rs#L151), [`core/dr-decode/src/profile.rs:1`](../core/dr-decode/src/profile.rs#L1), [`core/dr-decode/src/profile.rs:235`](../core/dr-decode/src/profile.rs#L235), [`core/dr-decode/src/profile.rs:286`](../core/dr-decode/src/profile.rs#L286), [`core/dr-decode/src/profile.rs:343`](../core/dr-decode/src/profile.rs#L343), [`core/dr-decode/src/profile.rs:458`](../core/dr-decode/src/profile.rs#L458), [`core/dr-decode/src/profile.rs:492`](../core/dr-decode/src/profile.rs#L492), [`core/dr-decode/src/profile.rs:630`](../core/dr-decode/src/profile.rs#L630), [`core/dr-gpu/src/adjust.rs:345`](../core/dr-gpu/src/adjust.rs#L345), [`core/dr-gpu/src/adjust.rs:35`](../core/dr-gpu/src/adjust.rs#L35), [`core/dr-gpu/src/demosaic.rs:121`](../core/dr-gpu/src/demosaic.rs#L121), [`core/dr-gpu/src/demosaic.rs:86`](../core/dr-gpu/src/demosaic.rs#L86), [`core/dr-gpu/tests/base_curve.rs:1`](../core/dr-gpu/tests/base_curve.rs#L1), [`core/dr-pipeline/src/operation.rs:1079`](../core/dr-pipeline/src/operation.rs#L1079), [`core/dr-pipeline/src/operation.rs:1104`](../core/dr-pipeline/src/operation.rs#L1104), [`core/dr-pipeline/src/operation.rs:1119`](../core/dr-pipeline/src/operation.rs#L1119), [`core/dr-pipeline/src/operation.rs:1140`](../core/dr-pipeline/src/operation.rs#L1140), [`core/dr-pipeline/src/operation.rs:154`](../core/dr-pipeline/src/operation.rs#L154), [`core/dr-pipeline/src/operation.rs:164`](../core/dr-pipeline/src/operation.rs#L164), [`core/dr-pipeline/src/operation.rs:277`](../core/dr-pipeline/src/operation.rs#L277) |
 | FR-DEV-3h | [`core/dr-decode/src/lib.rs:331`](../core/dr-decode/src/lib.rs#L331), [`core/dr-decode/src/preview.rs:29`](../core/dr-decode/src/preview.rs#L29), [`core/dr-pipeline/src/framing.rs:200`](../core/dr-pipeline/src/framing.rs#L200), [`core/dr-types/src/lib.rs:332`](../core/dr-types/src/lib.rs#L332) |
 | FR-DEV-4 | [`core/dr-gpu/src/lib.rs:211`](../core/dr-gpu/src/lib.rs#L211) |
 | FR-DEV-5 | [`core/dr-pipeline/src/history.rs:124`](../core/dr-pipeline/src/history.rs#L124), [`core/dr-pipeline/src/history.rs:1`](../core/dr-pipeline/src/history.rs#L1), [`core/dr-pipeline/src/history.rs:55`](../core/dr-pipeline/src/history.rs#L55), [`core/dr-pipeline/src/history.rs:71`](../core/dr-pipeline/src/history.rs#L71), [`core/dr-pipeline/src/history.rs:79`](../core/dr-pipeline/src/history.rs#L79), [`ui/dr-ui/src/develop.rs:1786`](../ui/dr-ui/src/develop.rs#L1786), [`ui/dr-ui/src/develop.rs:1796`](../ui/dr-ui/src/develop.rs#L1796), [`ui/dr-ui/src/develop.rs:44`](../ui/dr-ui/src/develop.rs#L44), [`ui/dr-ui/src/lib.rs:1093`](../ui/dr-ui/src/lib.rs#L1093) |