kyeongmin 201099e53b feat(IMP-09): PR 1 — col-axis solver + per-zone geometry mapper + retry gate ...

Stage 3 round 4 lock implementation: extend build_layout_css beyond
the horizontal-2-only dynamic path. Every layout_css return now
carries length-locked col-axis keys (widths_px, width_ratios,
dynamic_cols) matching the parsed css_areas grid (R rows, C cols),
so 2-D layouts (T / 2x2 in PR 2) and the unified
_compute_per_zone_geometry mapper can plug in without further
contract churn.

PR 1 scope:
  - _parse_css_areas + _parse_fr_string + _compute_per_zone_geometry
    (unified — 1-D and 2-D from the same code path)
  - compute_zone_layout_cols (vertical-2 weight-only solver)
  - _build_fr_default / _build_rows_dynamic / _build_cols_dynamic
    (populate widths_px/heights_px on every return path)
  - build_layout_css override branch keeps the warn-and-fallthrough
    legacy for unsupported presets (PR 2 promotes to strict raise)
  - retry gate in _attempt_zone_ratio_retry skips when dynamic_cols=True
    or dynamic_rows=False, with explicit retry_skipped_reason
  - Step 8 artifact gains zone_widths_px_planned /
    zone_col_ratios_planned (top-level) + zone_width_px_planned /
    zone_col_ratio_planned (per-zone)
  - debug_zones width injection via _compute_per_zone_geometry
    (replaces the legacy row-only zip)

Tests: tests/phase_z2/ — 47 new cases (parse / fr-string / cols solver /
per-zone geometry / build_layout_css contract / retry gate +
6 build_layout_css YAML fixtures + 3 retry_gate fixtures).

Verification: python -m pytest -q tests = 89 passed (was 42).
horizontal-2 grid CSS strings (areas/cols/rows) byte-identical to
legacy; only additive col-axis keys are introduced.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-16 12:03:23 +09:00

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