Stop describing a base curve the pipeline no longer has

D19 retired the per-body base curve, moved the matrix ahead of the
edits and the film into the view transform's place, but a dozen doc
comments still listed the curve among what a pixel passes through, or
said the film skipped it. The detail stage's module doc still drew the
matrix after the edits and the last detail pass encoding, which the
view pass took over. The film crate's README gave the base curves as
its reason for being data, and the ops README's list of hand-written
nodes had neither the view transform nor three of the five kernels.

FR-MRG-2 gave the base curve as why the merge cuts below the profile;
the view transform is why now. The decision table still said colour
defaults were a per-body curve, and FR-DEV-3j said only the default
view transform skips a JPEG, where the node skips one whatever its
sliders say. frame-budget.md records the view pass as unmeasured.

docs/dev/requirements.md

@@ -565,8 +565,9 @@ display 0.18. A photograph with the view transform at its defaults is **unedited
 is always composed, and "active" keeps meaning "moved from the defaults", so an untouched image
 writes no parameters and every other operation's neutral is still the image.
 
-An already-rendered source — a JPEG — is not rendered again: the default view transform is skipped
-for it, as the base curve was. A film stock is not, because choosing one is an edit.
+An already-rendered source — a JPEG — is not rendered again: the view transform is skipped for it,
+as the base curve was, so its two sliders do not move a JPEG. A film stock is not skipped, because
+choosing one is an edit.
 
 *Acceptance:* monotone in each channel; a neutral stays neutral; middle grey lands within 0.01 of
 0.18; between scene 0.03 and 1.0, the default is within 0.3 EV of the retired default curve; the
@@ -1911,7 +1912,7 @@ with no depth to recover — so it is where the shared machinery is built.
 
 **FR-MRG-2 — What is stitched.** Each source enters the merge in **camera space**: after black
 and white levels, demosaic and lens distortion correction, and before everything else — no white
-balance, no base curve, no camera matrix, no edit. The composite carries the first source's body,
+balance, no camera matrix, no edit, no view transform. The composite carries the first source's body,
 colour matrix and as-shot neutral, so that it is developed afterwards exactly as one of its
 sources would be: the camera profile, the white balance and every operation in §3.3 are applied
 once, to the composite, in its own develop.
@@ -1920,9 +1921,11 @@ This is the clause that decides what the output *is*. Stitching the rendered edi
 stitcher does; the result cannot be re-developed, and any difference between the frames' edits
 becomes a seam. Stitching camera-space pixels produces a photograph the camera could have taken,
 and nothing is applied twice. The cut sits *below* the profile, not above it, for a reason S15.3
-found in the pipeline: the base curve is part of the profile (FR-DEV-3e) and is applied to every
-frame of a known body, so a composite that baked it in and then developed as one would render the
-curve twice. Lens correction alone sits above the cut, because a distorted frame does not align.
+found in the pipeline: the profile's rendering was applied to every frame of a known body, so a
+composite that baked it in and then developed as one would render it twice. *(Amended 2026-09-27,
+D19: that rendering was the per-body base curve, retired; the view transform that replaces it is
+applied to every develop, so the reason stands.)* Lens correction alone sits above the cut, because
+a distorted frame does not align.
 White balance sits below it because the sensor saw the same light in every frame: un-balanced
 camera RGB agrees across the overlaps whether or not the camera's auto white balance drifted, and
 the balanced values would not.
@@ -2429,7 +2432,7 @@ Settled by requirements calibration, 2026-08-08.
 | Culling | **The core differentiator** (§3.9) |
 | Focus checking | Peaking *and* zoom |
 | Ingest | Full workflow — template rename, checksum verify, dual-destination |
-| Colour defaults | Good, not obsessive — matrices plus per-body base curve |
+| Colour defaults | Good, not obsessive — matrices plus one scene-referred view transform for every body (D19; the per-body base curves are retired) |
 | Film simulation | Fujifilm explicitly targeted |
 | AI | Denoise in v1; masking deferred. Per-face eye state and head pose are in v1 **as culling evidence, not AI** (FR-CULL-8a, FR-CULL-13); gaze deferred (§7) |
 | Local adjustments | Full masking, GPU-rasterised |