Assert the frame budget, and commit the numbers behind the FR-DSP-2 verdict

FR-DSP-3 states a latency requirement and nothing checked it, which makes it a
wish. This adds the check and the measurements it guards.

`docs/frame-budget.md` is the bench's output with the reading of §2's decision
rule attached. The short version: every point-operation chain at every viewport
size, fit and at 1:1, is inside 16 ms at the 99th percentile — the widest is
4.5 ms of GPU at 4K — so FR-DSP-2 should be rewritten rather than implemented.
The measurement did find a stage that misses the budget, and it is the one §2
predicted: clarity's 52-pixel separable kernel costs 34 ms at 4K. Tiles make
that worse rather than better, since a tiled convolution reads a halo per tile;
the fix `local_contrast` already names for itself is a base computed at reduced
resolution.

The test guards the fused path and says so, at length, rather than quietly
excluding the expensive stage and letting the tag imply otherwise (§7). What it
asserts is exactly the claim the recommendation rests on: one dispatch over a
viewport-sized target, at a full chain, is comfortably inside a frame.

Two things the numbers forced:

- The two cases are one `#[test]`. As two they ran on a thread each, contended
  for the same device, and took the 1:1 case from 2.5 ms to 14.9 ms — a
  measurement of the harness that would have flickered either side of the
  budget forever.

- The CPU half of the frame is judged only in an optimised build. Composition
  is real per-frame work on the UI thread and belongs in the budget, but the
  workspace builds its own crates at `opt-level = 0` in dev and `cargo test` is
  a dev build, so measuring it there measures rustc. The GPU half is asserted
  either way.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docs/traceability.md

@@ -9,17 +9,17 @@ Denominators are parsed from [`requirements.md`](requirements.md) at run time, n
 
 | Metric | Value |
 |---|---|
-| Source files scanned | 255 |
-| TRACES tags found | 732 |
+| Source files scanned | 257 |
+| TRACES tags found | 737 |
 | Requirements defined | 177 |
-| Requirements covered | 98 |
-| **Coverage** | **55.4%** (98/177) |
+| Requirements covered | 100 |
+| **Coverage** | **56.5%** (100/177) |
 
 ### By type
 
 | Type | Covered | Defined |
 |---|---|---|
-| FR | 78 | 122 |
+| FR | 80 | 122 |
 | NFR | 18 | 49 |
 | R | 2 | 6 |
 
@@ -71,6 +71,8 @@ _None._
 | FR-DEV-7 | [`core/dr-pipeline/src/history.rs:214`](../core/dr-pipeline/src/history.rs#L214), [`core/dr-pipeline/src/history.rs:499`](../core/dr-pipeline/src/history.rs#L499), [`core/dr-pipeline/src/history.rs:526`](../core/dr-pipeline/src/history.rs#L526), [`ui/dr-ui/src/develop.rs:3410`](../ui/dr-ui/src/develop.rs#L3410), [`ui/dr-ui/src/develop.rs:3442`](../ui/dr-ui/src/develop.rs#L3442), [`ui/dr-ui/src/lib.rs:1408`](../ui/dr-ui/src/lib.rs#L1408), [`ui/dr-ui/src/lib.rs:2294`](../ui/dr-ui/src/lib.rs#L2294), [`ui/dr-ui/ui/history.slint:1`](../ui/dr-ui/ui/history.slint#L1) |
 | FR-DEV-8 | [`core/dr-gpu/src/detail.rs:252`](../core/dr-gpu/src/detail.rs#L252), [`core/dr-gpu/src/detail.rs:434`](../core/dr-gpu/src/detail.rs#L434), [`core/dr-gpu/tests/detail_instances.rs:1`](../core/dr-gpu/tests/detail_instances.rs#L1), [`core/dr-gpu/tests/spot_removal.rs:1`](../core/dr-gpu/tests/spot_removal.rs#L1), [`core/dr-pipeline/src/detail.rs:363`](../core/dr-pipeline/src/detail.rs#L363), [`core/dr-pipeline/src/detail.rs:387`](../core/dr-pipeline/src/detail.rs#L387), [`core/dr-pipeline/src/detail.rs:422`](../core/dr-pipeline/src/detail.rs#L422), [`core/dr-pipeline/src/detail.rs:496`](../core/dr-pipeline/src/detail.rs#L496), [`core/dr-pipeline/src/graph.rs:113`](../core/dr-pipeline/src/graph.rs#L113), [`core/dr-pipeline/src/graph.rs:191`](../core/dr-pipeline/src/graph.rs#L191), [`core/dr-pipeline/src/graph.rs:681`](../core/dr-pipeline/src/graph.rs#L681), [`core/dr-pipeline/src/operation.rs:299`](../core/dr-pipeline/src/operation.rs#L299), [`core/dr-pipeline/src/operation.rs:517`](../core/dr-pipeline/src/operation.rs#L517), [`core/dr-pipeline/src/sidecar.rs:183`](../core/dr-pipeline/src/sidecar.rs#L183), [`core/dr-pipeline/src/sidecar.rs:352`](../core/dr-pipeline/src/sidecar.rs#L352), [`core/dr-pipeline/src/sidecar.rs:672`](../core/dr-pipeline/src/sidecar.rs#L672), [`core/dr-pipeline/src/sidecar.rs:808`](../core/dr-pipeline/src/sidecar.rs#L808), [`core/dr-pipeline/src/sidecar.rs:862`](../core/dr-pipeline/src/sidecar.rs#L862), [`core/dr-pipeline/src/sidecar.rs:892`](../core/dr-pipeline/src/sidecar.rs#L892), [`core/dr-pipeline/src/spot.rs:115`](../core/dr-pipeline/src/spot.rs#L115), [`core/dr-pipeline/src/spot.rs:151`](../core/dr-pipeline/src/spot.rs#L151), [`core/dr-pipeline/src/spot.rs:1`](../core/dr-pipeline/src/spot.rs#L1), [`core/dr-pipeline/src/spot.rs:207`](../core/dr-pipeline/src/spot.rs#L207), [`core/dr-pipeline/src/spot.rs:387`](../core/dr-pipeline/src/spot.rs#L387), [`core/dr-pipeline/src/spot.rs:472`](../core/dr-pipeline/src/spot.rs#L472), [`core/dr-pipeline/src/spot.rs:582`](../core/dr-pipeline/src/spot.rs#L582), [`core/dr-pipeline/src/spot.rs:673`](../core/dr-pipeline/src/spot.rs#L673), [`core/dr-pipeline/src/state.rs:103`](../core/dr-pipeline/src/state.rs#L103), [`core/dr-pipeline/tests/spot_sidecar.rs:1`](../core/dr-pipeline/tests/spot_sidecar.rs#L1), [`core/dr-pipeline/tests/spots.rs:1`](../core/dr-pipeline/tests/spots.rs#L1), [`ui/dr-ui/src/develop.rs:2127`](../ui/dr-ui/src/develop.rs#L2127), [`ui/dr-ui/src/develop.rs:2165`](../ui/dr-ui/src/develop.rs#L2165), [`ui/dr-ui/src/develop.rs:2230`](../ui/dr-ui/src/develop.rs#L2230), [`ui/dr-ui/src/develop.rs:2313`](../ui/dr-ui/src/develop.rs#L2313), [`ui/dr-ui/src/develop.rs:2327`](../ui/dr-ui/src/develop.rs#L2327), [`ui/dr-ui/src/develop.rs:658`](../ui/dr-ui/src/develop.rs#L658), [`ui/dr-ui/src/labels.rs:52`](../ui/dr-ui/src/labels.rs#L52), [`ui/dr-ui/src/lib.rs:1429`](../ui/dr-ui/src/lib.rs#L1429), [`ui/dr-ui/src/lib.rs:2391`](../ui/dr-ui/src/lib.rs#L2391), [`ui/dr-ui/src/lib.rs:306`](../ui/dr-ui/src/lib.rs#L306), [`ui/dr-ui/src/spots_ui.rs:19`](../ui/dr-ui/src/spots_ui.rs#L19), [`ui/dr-ui/src/spots_ui.rs:1`](../ui/dr-ui/src/spots_ui.rs#L1), [`ui/dr-ui/src/spots_ui.rs:265`](../ui/dr-ui/src/spots_ui.rs#L265), [`ui/dr-ui/ui/adjust.slint:676`](../ui/dr-ui/ui/adjust.slint#L676), [`ui/dr-ui/ui/app.slint:1835`](../ui/dr-ui/ui/app.slint#L1835), [`ui/dr-ui/ui/app.slint:2352`](../ui/dr-ui/ui/app.slint#L2352), [`ui/dr-ui/ui/app.slint:2618`](../ui/dr-ui/ui/app.slint#L2618), [`ui/dr-ui/ui/app.slint:332`](../ui/dr-ui/ui/app.slint#L332), [`ui/dr-ui/ui/spots.slint:48`](../ui/dr-ui/ui/spots.slint#L48), [`ui/dr-ui/ui/spots.slint:5`](../ui/dr-ui/ui/spots.slint#L5) |
 | FR-DSP-1 | [`core/dr-gpu/src/adjust.rs:2088`](../core/dr-gpu/src/adjust.rs#L2088), [`core/dr-gpu/src/adjust.rs:2165`](../core/dr-gpu/src/adjust.rs#L2165), [`core/dr-gpu/src/adjust.rs:2250`](../core/dr-gpu/src/adjust.rs#L2250), [`core/dr-gpu/src/adjust.rs:54`](../core/dr-gpu/src/adjust.rs#L54), [`core/dr-gpu/src/adjust.rs:770`](../core/dr-gpu/src/adjust.rs#L770), [`core/dr-gpu/src/lib.rs:54`](../core/dr-gpu/src/lib.rs#L54), [`core/dr-gpu/src/lib.rs:94`](../core/dr-gpu/src/lib.rs#L94), [`core/dr-gpu/tests/capture_sharpen.rs:200`](../core/dr-gpu/tests/capture_sharpen.rs#L200), [`core/dr-gpu/tests/detail_stage.rs:328`](../core/dr-gpu/tests/detail_stage.rs#L328), [`core/dr-gpu/tests/local_contrast.rs:263`](../core/dr-gpu/tests/local_contrast.rs#L263), [`core/dr-gpu/tests/noise_reduction.rs:378`](../core/dr-gpu/tests/noise_reduction.rs#L378), [`core/dr-pipeline/src/detail.rs:136`](../core/dr-pipeline/src/detail.rs#L136), [`core/dr-pipeline/src/detail.rs:465`](../core/dr-pipeline/src/detail.rs#L465), [`core/dr-pipeline/src/graph.rs:543`](../core/dr-pipeline/src/graph.rs#L543), [`core/dr-pipeline/src/graph.rs:573`](../core/dr-pipeline/src/graph.rs#L573), [`core/dr-pipeline/src/ops/capture_sharpen.rs:1`](../core/dr-pipeline/src/ops/capture_sharpen.rs#L1), [`core/dr-pipeline/src/ops/capture_sharpen.rs:654`](../core/dr-pipeline/src/ops/capture_sharpen.rs#L654), [`core/dr-pipeline/src/ops/local_contrast.rs:1`](../core/dr-pipeline/src/ops/local_contrast.rs#L1), [`core/dr-pipeline/src/ops/local_contrast.rs:662`](../core/dr-pipeline/src/ops/local_contrast.rs#L662), [`core/dr-pipeline/src/ops/noise_reduction.rs:695`](../core/dr-pipeline/src/ops/noise_reduction.rs#L695), [`core/dr-pipeline/src/spot.rs:673`](../core/dr-pipeline/src/spot.rs#L673), [`ui/dr-ui/src/develop.rs:2627`](../ui/dr-ui/src/develop.rs#L2627), [`ui/dr-ui/src/develop.rs:3640`](../ui/dr-ui/src/develop.rs#L3640), [`ui/dr-ui/src/develop.rs:4123`](../ui/dr-ui/src/develop.rs#L4123), [`ui/dr-ui/src/develop.rs:4157`](../ui/dr-ui/src/develop.rs#L4157), [`ui/dr-ui/src/lib.rs:70`](../ui/dr-ui/src/lib.rs#L70), [`ui/dr-ui/src/lib.rs:736`](../ui/dr-ui/src/lib.rs#L736), [`ui/dr-ui/src/lib.rs:795`](../ui/dr-ui/src/lib.rs#L795) |
+| FR-DSP-3 | [`core/dr-gpu/tests/frame_budget.rs:101`](../core/dr-gpu/tests/frame_budget.rs#L101) |
+| FR-DSP-5 | [`core/dr-gpu/tests/frame_budget.rs:101`](../core/dr-gpu/tests/frame_budget.rs#L101), [`core/dr-gpu/tests/zoom_resolution.rs:131`](../core/dr-gpu/tests/zoom_resolution.rs#L131), [`core/dr-gpu/tests/zoom_resolution.rs:162`](../core/dr-gpu/tests/zoom_resolution.rs#L162), [`core/dr-gpu/tests/zoom_resolution.rs:1`](../core/dr-gpu/tests/zoom_resolution.rs#L1), [`core/dr-gpu/tests/zoom_resolution.rs:212`](../core/dr-gpu/tests/zoom_resolution.rs#L212) |
 | FR-DSP-6 | [`core/dr-pipeline/src/operation.rs:446`](../core/dr-pipeline/src/operation.rs#L446), [`core/dr-types/src/colour.rs:1`](../core/dr-types/src/colour.rs#L1) |
 | FR-DSP-7 | [`core/dr-gpu/src/histogram.rs:147`](../core/dr-gpu/src/histogram.rs#L147), [`core/dr-gpu/src/histogram.rs:1`](../core/dr-gpu/src/histogram.rs#L1), [`core/dr-gpu/src/histogram.rs:281`](../core/dr-gpu/src/histogram.rs#L281), [`core/dr-gpu/src/histogram.rs:50`](../core/dr-gpu/src/histogram.rs#L50), [`core/dr-gpu/src/shaders/histogram.wgsl:1`](../core/dr-gpu/src/shaders/histogram.wgsl#L1), [`ui/dr-ui/src/develop.rs:2693`](../ui/dr-ui/src/develop.rs#L2693), [`ui/dr-ui/src/develop.rs:5225`](../ui/dr-ui/src/develop.rs#L5225), [`ui/dr-ui/src/develop.rs:5257`](../ui/dr-ui/src/develop.rs#L5257), [`ui/dr-ui/src/develop.rs:621`](../ui/dr-ui/src/develop.rs#L621), [`ui/dr-ui/src/histogram.rs:1`](../ui/dr-ui/src/histogram.rs#L1), [`ui/dr-ui/src/lib.rs:1485`](../ui/dr-ui/src/lib.rs#L1485), [`ui/dr-ui/src/lib.rs:296`](../ui/dr-ui/src/lib.rs#L296), [`ui/dr-ui/ui/app.slint:292`](../ui/dr-ui/ui/app.slint#L292), [`ui/dr-ui/ui/histogram.slint:122`](../ui/dr-ui/ui/histogram.slint#L122), [`ui/dr-ui/ui/histogram.slint:1`](../ui/dr-ui/ui/histogram.slint#L1) |
 | FR-EXP-1 | [`core/dr-export/src/encode.rs:1`](../core/dr-export/src/encode.rs#L1), [`core/dr-export/src/lib.rs:1`](../core/dr-export/src/lib.rs#L1), [`core/dr-types/src/settings.rs:1`](../core/dr-types/src/settings.rs#L1), [`ui/dr-ui/src/settings_ui.rs:1`](../ui/dr-ui/src/settings_ui.rs#L1) |
@@ -134,7 +136,7 @@ _None._
 
 ## Not yet tagged
 
-79 of 177 requirements have no implementation tag. Expected while the codebase is young; each should gain one as it is built.
+77 of 177 requirements have no implementation tag. Expected while the codebase is young; each should gain one as it is built.
 
 <details><summary>Show untagged requirements</summary>
 
@@ -146,9 +148,7 @@ _None._
 - FR-DEV-1
 - FR-DEV-3g
 - FR-DSP-2
-- FR-DSP-3
 - FR-DSP-4
-- FR-DSP-5
 - FR-DSP-8
 - FR-NC-11
 - FR-PLAT-AND-2