Materialize accepted grants once through owner frames

[pinin4fjords]

Parent: #1745

Predecessor: #1755 and its stacked draft PR, which persisted the accepted plan and made re-observation consume it.

Prototype evidence: draft PR #1743 and checkpoint 3f11f175, especially the carried-port reconciliation in svg.py.

Retrieving the prototype: git fetch origin refs/pull/1743/head:pr-1743-checkpoint, then read files with git show 3f11f1758f16341ace6b1409eff53a36a36ec715:<path>. Never check that branch out into your worktree.

Outcome

Project carried-port, header, envelope, and containment translations through the accepted owner frames, and materialize accepted member and convergence grants exactly once, emitting the TYPED_MATERIALIZATION trace event. Publishing and enforcing the cohort-final freeze is the successor's job (#1757); this issue delivers the single typed materialization the freeze will protect.

The chokepoint decision, stated explicitly: after this issue, the carried-port, header, envelope, and containment chokepoints in _settle_render_geometry are owner-frame projections of the persisted plan, not re-routes. #1755 made that possible by making re-observation consume the plan; this issue makes the translations themselves flow through the stored owner frames. If a chokepoint cannot be expressed as a projection of the accepted record, stop: that is evidence the accepted plan or translation basis is incomplete, not permission for a repair pass.

Estimate: 4-6 focused hours, hard maximum one working day. Use a fresh worktree based on the predecessor PR.

Starting reproduction

pytest -q -n 0 tests/test_corridor_cohort_integration.py -k 'materializ' --collect-only -q

Zero collected on the predecessor: the materialization locks named below do not exist yet.

Scope

• Make the accepted record the sole owner during final materialization.
• member_geometry.py: project exact persisted member/edge/segment identities through their stored owner frames.
• convergences.py: project exact persisted plan/trunk recipe identities through their stored owner frames.
• svg.py: gather the known carried-port/header/envelope/containment translations, materialize once, and emit TYPED_MATERIALIZATION from Trace final settlement and resolve seed-72 routing defects #1746's vocabulary at that point.
• One focused materialization test module may cover both owner kinds and the four translation sources.
• Record the displaced re-route forms in the PR body under "Coordinates transferred / setters deleted in this PR" and delete them here.

Test additions

• test_final_solve_materializes_accepted_grants_before_cohort_final
• test_owner_frame_translation_is_solver_free

(The third lock, test_post_freeze_stages_are_validation_only, belongs to #1757, which makes the freeze binding.)

Preserve test_after_final_checkpoint_sees_settled_geometry (on main), test_render_consumes_discovery_deferral_at_final_route_guard (ported by #1759), and the opposing-bypass geometry lock test_opposing_bypass_lines_hold_separated_direction_qualified_lanes (landed by #1761).

Non-goals

• No freeze publication or post-freeze enforcement (that is Publish and enforce the cohort-final freeze #1757).
• No new planning/render stage, solver call, constraint lowering, clearance publication, proximity search, or direction adjustment.
• No replay compilation fallback.

Acceptance

• Stage order through this child is final solve -> typed materialization, trace-asserted.
• Carried-port, header, envelope, and containment translations preserve exact accepted ordering and grants during the single typed materialization.
• Materialization is idempotent as a property; production invokes it exactly once, asserted by the Trace final settlement and resolve seed-72 routing defects #1746 trace counter.
• Only explicitly controlled IDs move, by the stored owner-frame delta.
• No owner appears, disappears, or changes disposition during materialization.
• Opposite-running routes are never bundled during translation, and the opposing-bypass geometry lock still passes.
• The behavior-changing stacked PR runs CI and the authoritative render diff; it remains draft and unmerged until the complete stack is green.

Verification

pytest -q -n 0 tests/test_corridor_cohort_integration.py::test_final_solve_materializes_accepted_grants_before_cohort_final tests/test_corridor_cohort_integration.py::test_owner_frame_translation_is_solver_free
pytest -q -n 0 tests/test_deferred_final_guards.py
pytest -q -n 0 tests/test_convergence_corridor_grants.py
pytest -q -n 0 tests/test_corridor_cohort_integration.py -k 'opposing_bypass'
pytest -q -n 0 tests/test_hash_seed_determinism.py
ruff check src/nf_metro/layout/routing/member_geometry.py src/nf_metro/layout/routing/convergences.py src/nf_metro/render/svg.py
ruff format --check src/nf_metro/layout/routing/member_geometry.py src/nf_metro/layout/routing/convergences.py src/nf_metro/render/svg.py
mypy

Check the collected count on every -k run. Behavioral children also refresh the derived corpora (hash pins, gate coverage, guard goldens) and declare the churn in the PR body.

#1653 guardrail and stop condition

This issue finishes one typed materialization. If a translation changes feasibility, owner membership, or order, stop: that is evidence that the accepted plan or translation basis is incomplete, not permission for a repair. Deletion is part of the ownership transfer: if removing a displaced re-route path exposes missing coverage, stop and repair the earlier owner model; do not retain dual ownership.