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fix(task-25): page_setup_truth and settings_pdf_mediabox_a3 move the sheet to ANSI B before proving A3

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A fresh Layout1 is already ISO A3 landscape (ezdxf R2018 default: 420 x 297,
plot_rotation 0), so an A3-only /MediaBox read-back passed with
page_setup_apply stubbed to a no-op: the A/B gate row and the v4 matrix task
could not fail on the setter. Both now apply ANSI B (432 x 279, a size no
fresh document has; spec section 9 names it) and read that PDF first, then
apply ISO A3, read its PDF, and require the setter's changed.size_mm to have
moved from B to A3. The stub fails at the first PDF.

The moved-sheet comparison is +/-0.5 mm, the spec's tolerance, not exact:
measured live on AutoCAD 2026 (scratch Documents.Add(), closed unsaved), the
COM engine reports ANSI B as 431.8 x 279.4 and the DWG To PDF.pc3 file's
MediaBox as 431.8 x 279.4 then 420.158 x 297.039 for A3; the task passes
there with changed.size_mm [[431.8, 279.4], [420.0, 297.0]]. Headless it is
[[432.0, 279.0], [420.0, 297.0]].

tests/test_benchmark_v4.py gains the mutation test the finding describes
(setter stubbed -> both rows must fail; both passed on the old code) and a
run of the gate row itself; the headless task test asserts the B stage.
README rows and the tasks_v4 docstring say what the task now does; the README
collected-tests figure follows the two new tests (3282 -> 3284). The
regenerated A/B report against v1.5.1 is byte-identical (26 -> 32/32).

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FKFStjEFzpGyLq5bMpWxTd
This commit is contained in:
Umut CAN
2026-09-22 13:27:17 +03:00
co-authored by Claude Opus 5
parent c2942d3c94
commit 18c7c69da6
6 changed files with 134 additions and 14 deletions
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README.md
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@@ -27,7 +27,7 @@ Live through COM on Windows, or headless through ezdxf anywhere — one typed co
</div>
> **v1.5 release snapshot:** 204 tools · 8 resources · 5 prompt templates · 3282 collected tests.
> **v1.5 release snapshot:** 204 tools · 8 resources · 5 prompt templates · 3284 collected tests.
> 204 is the **registered** count; a default install advertises 199 over `tools/list`,
> because `ENABLE_3D` is unset. `system_about` is the runtime authority.
@@ -176,7 +176,7 @@ An earlier matrix scored this server 10/10, which carried no information: every
| `selection_filter` | window 1, crossing 2, bounding box 3, polygon 1 |
| `measure_from_handle` | 139.2699 against the 100.0 a vertex shoelace gives |
| `pid_roundtrip` | the example sheet drawn by `pid_from_spec`, read back by `pid_graph`, which never sees the spec: 5 nodes, 4 edges, 0 dangling, `confidence_min` 1.0, `FIC-101` wired to `FCV-101` |
| `page_setup_truth` | ISO A3 landscape applied to Layout1, plotted through `batch_plot`, and the sheet read back from the PDF's `/MediaBox`: 420 × 297 mm, not the setter's return value |
| `page_setup_truth` | ANSI B then ISO A3 landscape applied to Layout1, each plotted through `batch_plot` and read back from its PDF's `/MediaBox`: 432 × 279 then 420 × 297 mm, not the setter's return value (a fresh layout is already A3, so the B sheet is what a no-op setter cannot fake) |
### Headless performance