untracked files on main: dceb101 feat(#63): IMP-34 R1 donor capacity measured bound (u1+u2)

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## [Claude #2] Stage 6 — Verification Round #2
### Re-read issue
Scope = `build_layout_css` 분기 확장 to **top-1-bottom-2 / top-2-bottom-1 / left-1-right-2 / left-2-right-1 / grid-2x2** (issue text: "현재 horizontal-2 / vertical-2 만 dynamic — 다른 preset 도 dynamic").
Guardrail = Kei `build_containers_type_b` (page_structure) 회귀 X + zone-level ratio 변경 시 Step 8 trace 설명 가능.
### Full pytest
```
python -m pytest -q tests
89 passed in 6.96s
```
Phase Z2 subset: 47/47 passed.
### AS-IS (HEAD = 201099e, "IMP-09 PR 1 — col-axis solver + per-zone geometry mapper + retry gate")
**Static evidence — dispatch is still rows / cols only** (src/phase_z2_pipeline.py:12141221):
```python
# ── Dynamic branch — topology dispatch (PR 1: rows / cols only) ──
if topology == "rows":
return _build_rows_dynamic(preset, zones_data, gap)
if topology == "cols":
return _build_cols_dynamic(preset, zones_data, gap)
# PR 2 will dispatch T / inverted-T / side-T-{left,right} / 2x2 here.
# PR 3 will dispatch single here.
return _build_fr_default(preset)
```
Override path (src/phase_z2_pipeline.py:12051212) still warn-and-fallthrough for non rows/cols presets.
**Runtime probe — `python -c "from src.phase_z2_pipeline import build_layout_css; …"`** with zones carrying `content_weight=1.0, min_height_px=100`:
| Preset | dynamic_rows | dynamic_cols | computation |
|---|---|---|---|
| `single` | False | False | `fr_default_from_preset` |
| `top-1-bottom-2` | False | False | `fr_default_from_preset` |
| `top-2-bottom-1` | False | False | `fr_default_from_preset` |
| `left-1-right-2` | False | False | `fr_default_from_preset` |
| `left-2-right-1` | False | False | `fr_default_from_preset` |
| `grid-2x2` | False | False | `fr_default_from_preset` |
(horizontal-2 / vertical-2 raise on this minimal probe schema — they require richer zones_data than `content_weight + min_height_px` alone, which is the PR 1 dynamic branch contract, not a regression. PR 1's own tests (tests/phase_z2/test_build_layout_css_pr1.py) cover them with full fixtures and pass.)
**Test evidence — PR 1 tests explicitly assert the unfinished state** (tests/phase_z2/test_build_layout_css_pr1.py:145154):
```python
"""T-shape (top-1-bottom-2) falls through to fr_default in PR 1 …"""
result = build_layout_css("top-1-bottom-2", zones)
assert result["computation"] == "fr_default_from_preset"
```
This is a **PR 1 lock-in** assertion, not closure of B-4. PR 2 will need to update these tests when topology dispatch lands.
### TO-BE (issue scope target)
Issue requires **all 5 listed presets** (top-1-bottom-2, top-2-bottom-1, left-1-right-2, left-2-right-1, grid-2x2) to be dynamic — currently 0/5 are. PR 1's stated plan locates this in PR 2 (T / inverted-T / side-T-{left,right} / 2x2) + PR 3 (single).
### Gaps vs Close
| Axis | Issue requirement | Current state | Gap |
|---|---|---|---|
| top-1-bottom-2 dynamic | required | fr_default fallthrough | NOT MET |
| top-2-bottom-1 dynamic | required | fr_default fallthrough | NOT MET |
| left-1-right-2 dynamic | required | fr_default fallthrough | NOT MET |
| left-2-right-1 dynamic | required | fr_default fallthrough | NOT MET |
| grid-2x2 dynamic | required | fr_default fallthrough | NOT MET |
| Kei build_containers_type_b guardrail | not regressed | untouched (src/space_allocator.py:445) | OK |
| Step 8 trace zone-ratio explainability | needed for new presets | only rows/cols carry `zone_widths_px_planned` / `zone_col_ratios_planned` today | NOT MET for 5 new presets |
### Conclusion
**Round #2 = NOT CLOSED.** PR 1 (HEAD 201099e) is a foundation lock (col-axis solver + per-zone geometry mapper + retry gate) — additive infrastructure that the issue scope can build on, but the issue scope itself (5 additional dynamic topologies) is **0/5 delivered**. PR 2 (T / inverted-T / side-T / 2x2) and PR 3 (single) are still required for B-4 closure.
I concur with Codex #1's verdict (NOT VERIFIED for close).
=== EVIDENCE ===
Commands run:
- git log --oneline -5
- git status --short
- python -m pytest -q tests
- python -m pytest -q tests/phase_z2
- python -c "from src.phase_z2_pipeline import build_layout_css; …" (runtime probe across 8 presets)
- grep -n "build_containers_type_b\|page_structure" src/space_allocator.py src/phase_z2_pipeline.py
- grep -n "fr_default_from_preset\|top-1-bottom-2\|grid-2x2\|fall.*through" tests/phase_z2/test_build_layout_css_pr1.py
Files checked:
- D:\ad-hoc\kei\design_agent\src\phase_z2_pipeline.py (lines 11801221)
- D:\ad-hoc\kei\design_agent\src\space_allocator.py (line 314, 445 — build_containers_type_b untouched)
- D:\ad-hoc\kei\design_agent\tests\phase_z2\test_build_layout_css_pr1.py (line 145154 — PR 1 lock assertion)
Verified facts:
- HEAD = 201099e "feat(IMP-09): PR 1 — col-axis solver + per-zone geometry mapper + retry gate"
- build_layout_css topology dispatch handles only "rows" / "cols"; all other topologies return _build_fr_default(preset)
- 0/5 issue-scope presets are dynamic at runtime
- Kei build_containers_type_b (src/space_allocator.py:445) not touched — guardrail OK
- 89/89 pytest tests pass — but pass on the PR 1 lock contract, not full B-4 closure
FINAL_CONSENSUS: NO