CB-WP-0012-T02: adversarial review — not approvable as written

Four of six challenges conceded; the survey's two main arguments are
replaced rather than clarified.

C1  The survey concluded the sub-100k region was empty without ever
    measuring it. It is not empty: tiny-skia fits at 83,956, and the
    real windowed floor is fltk at 140,079 — 1.5x corrected headroom,
    not 128x. "Two orders of magnitude" is withdrawn.

C1b Following that concession: wgpu+winit is 1,741,979 marginal lines
    against a 250,000 target. AM-4a is incompatible with INTENT stage 2
    by 7x, and has been since both were written. Raised for the
    maintainer; deliberately not decided by this pass.

C2  "Marginal cost zero" was scored on an axis chosen to produce zero,
    and the same relocation already flattered sdl2 and fltk in the
    survey's own table. One acquisition rule now covers all three, and
    it raises two candidates' cost rather than lowering the winner's.

C3  The survey contradicted itself on the second-use rule. cb-render-api
    and cb-render-null are withdrawn; cb-render-html ships against the
    existing Project trait, and the port waits for stage 2's second use.

C6  The candidate measurements did carry a positive control. The C1
    batch did not — it copied dep-weight.py's measurement function
    without its guards — and was re-measured under them before being
    cited. Figures reproduced unchanged. The HTML row is relabelled
    0 by construction, not by measurement.

C4/C5 become six controls binding on ADR-0007.

The recommendation stands. The reasoning that reached it does not.

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

workplans/CB-WP-0012-render-port.md

@@ -102,7 +102,7 @@ left to stage 2 where it becomes the interface's second use.
 
 ```task
 id: CB-WP-0012-T02
-status: todo
+status: done
 priority: high
 ```
 
@@ -120,6 +120,43 @@ it. The review must name, at minimum:
 A review that ratifies the survey without producing a control the survey
 lacked has not run.
 
+**Done 2026-08-02.** [challenge](../history/260802-render-port-challenge.md),
+[response](../history/260802-render-port-response.md). **Not approvable as
+written** — four of six challenges conceded, and the survey's two main
+arguments replaced.
+
+- **C1**: the survey concluded the sub-100k region was empty without
+  measuring it. It is not empty. `tiny-skia` fits at 83,956; the real
+  windowed floor is `fltk` at **140,079 — 1.5×** corrected headroom, not
+  128×. "Two orders of magnitude" withdrawn.
+- **C1b**, which the concession exposed: `wgpu` + `winit` is **1,741,979**
+  marginal lines against a 250,000 target. **AM-4a is incompatible with
+  INTENT stage 2** — 7× the whole target — and has been since both were
+  written. Raised for the maintainer, deliberately not decided here.
+- **C2**: "marginal cost zero" was scored on an axis chosen to produce
+  zero, and the same move already flattered `sdl2`/`fltk`. One acquisition
+  rule now covers all three, and it *raises* two candidates' cost.
+- **C3**: the survey contradicted itself on the second-use rule.
+  **`cb-render-api` and `cb-render-null` are withdrawn from this pass.**
+- **C4/C5**: six controls adopted as binding on ADR-0007 — a loopback
+  token with a mutation-backed refusal test, JS barred from constructing
+  commands, and the coverage gate crossing the language boundary.
+- **C6**: the candidate measurements did carry a positive control (empty
+  `unlocated` for all seven, verified). The C1 batch did **not** — it
+  copied the measurement function without the guards — and was re-measured
+  under them before being cited. The HTML row is relabelled *0 by
+  construction, not by measurement*.
+
+**Fidelity note:** the review ran in the same session as the survey rather
+than a separate one, per this environment's standing instruction not to
+spawn agents unasked. It therefore inherits the author's sampling and is a
+lower bound on what a separate reviewer would find.
+
+**Note on tier:** this pass no longer creates a capability port, which was
+its structural trigger for tier L. The declaration and its roll stand — a
+tier that changes because review shrank the work would be a function of the
+outcome. Recorded as the CHAOS window's second entry.
+
 ## Task: ADR-0007 — the render port
 
 ```task