C.E.L_Slide_test2/.orchestrator/tmp/issue9_u1_comment.md

Executing unit: u1

[Claude #3] Stage 3 Round #1 — IMP-09 PR 2 u1

unit_executed

• id: u1
• summary: Add TOPOLOGY_AXIS_MAP constant + _TWO_D_TOPOLOGIES frozenset (5 in-scope topology → row/col position groupings, no dispatch wiring)

files_changed

• src/phase_z2_pipeline.py (+36 / -0)

diff_summary

• Inserted after _build_cols_dynamic (HEAD line 1113) and before the existing comment at HEAD line 1116. No edits to any other surface; PR 1 helpers (_parse_css_areas, _parse_fr_string, compute_zone_layout, compute_zone_layout_cols, _compute_per_zone_geometry, _build_fr_default, _build_rows_dynamic, _build_cols_dynamic) untouched.
• New constants:
  • TOPOLOGY_AXIS_MAP: dict[str, dict[str, list[list[str]]]] — keys = {"T", "inverted-T", "side-T-left", "side-T-right", "2x2"}; each value carries "rows" (row-track groupings for compute_zone_layout heights) and "cols" (col-track groupings for compute_zone_layout_cols widths).
  • _TWO_D_TOPOLOGIES = frozenset(TOPOLOGY_AXIS_MAP) — 5-element membership-test surface for u6/u7 dispatch.
• Spanning-zone convention recorded in the docblock:
  • T."top" spans both cols → excluded from cols.
  • inverted-T."bottom" spans both cols → excluded from cols.
  • side-T-left."left" spans both rows → excluded from rows.
  • side-T-right."right" spans both rows → excluded from rows.
  • 2x2 — no spanning, every zone participates on both axes.
• No dispatch wiring is added in this unit. build_layout_css normal path still routes only topology in {"rows","cols"} to dynamic sinks; everything else still falls through to _build_fr_default. u6/u7 will consume the new constants.

evidence

• git log -1 --format=%H → 201099e53b0048f3040e17ee9b0394ba9ad6e940 (Stage 2 baseline confirmed).
• git diff --stat src/phase_z2_pipeline.py → 1 file changed, 36 insertions(+) (≤50-line gate ✓; ≤3-file gate ✓ — single file).
• python -c "import ast; ast.parse(open(...).read())" → PARSE OK.
• Import-load smoke (without committing): TOPOLOGY_AXIS_MAP keys = ['2x2', 'T', 'inverted-T', 'side-T-left', 'side-T-right']; _TWO_D_TOPOLOGIES = same 5 strings as a frozenset.
• Per-topology position-union vs templates/phase_z2/layouts/layouts.yaml:
  • T: union {top, bottom-left, bottom-right} = positions: [top, bottom-left, bottom-right] ✓
  • inverted-T: union {top-left, top-right, bottom} = positions: [top-left, top-right, bottom] ✓
  • side-T-left: union {left, right-top, right-bottom} = positions: [left, right-top, right-bottom] ✓
  • side-T-right: union {left-top, right, left-bottom} = positions: [left-top, right, left-bottom] ✓
  • 2x2: union {top-left, top-right, bottom-left, bottom-right} = positions: [top-left, top-right, bottom-left, bottom-right] ✓
• Working-tree sketch stashed pre-unit as stash@{0}: IMP-09 PR2 sketch (Stage 2 design reference; re-derive per unit) (preserved for u2–u7 consultation; Stage 3 re-derives from clean HEAD per Stage 1/2 contract).
• src/space_allocator.py untouched (Kei legacy build_containers_type_b invariant preserved at u26).

scope_lock compliance

• ✓ AI=0 normal path (PZ-1) — pure data declaration, no LLM call surface.
• ✓ 1 turn = 1 unit (PZ-2) — only u1 executed.
• ✓ No hardcoding beyond the 5-preset whitelist that Stage 1 explicitly enumerated.
• ✓ No edits to src/space_allocator.py.
• ✓ No retry-gate behavioral change (this unit does not touch the gate path).
• ✓ No new commits / pushes (deliverable = this comment).

remaining_units

u2, u3, u4, u5, u6, u7, u8, u9, u10, u11, u12, u13, u14, u15, u16, u17, u18, u19, u20, u21, u22, u23, u24, u25, u26 (25 units, total plan = 26)

follow_up_issue_candidates

None — no out-of-scope axis discovered in u1. Stage 2 follow-ups remain as recorded:

• single topology dynamic promotion (separate PR).
• retry_gate extension to 2-D presets beyond skip semantics.
• B4 frame_selection evidence integration.
• Consumer audit for Step 8 computation label change ("2d_dynamic_aggregated" / "user_override_2d" — introduced later in u6/u7).

next

continue_same — proceed to u2 (_aggregate_axis_zone helper) in the next turn. Stage 3 not yet complete.