fix(client): populate all declared movement fixture depths

[zoeyrose]

Summary

Fix the Classic GPU qualification fixture generator so the wire fixture exercises all 13 declared map depths.

• Populate qualification drawable layers across depths -6 through +6.
• Regenerate the 28x28 fixture and update its two wire workload snapshot pins and byte-test digests.
• Closes perf(client): finish GPU-native map rendering performance follow-up #489

Implementation / behavior

The wire_ceiling_payload generator already declared BENCHMARK_28_DEPTHS as -6..+6, and the two wire workloads require active_depths=13.
Its qualification-layer branch was additionally gated by depth == 0, so only one command depth was emitted. The patch removes that gate.
The 64 actor layers remain depth-zero-only and the existing layer placement/seed logic is unchanged.

The corrected fixture decodes to 13 non-empty depth buckets with 64 actor occurrences and remains within the 65535-byte MAP2 packet limit.
Content remains pinned to atrinik/content main / v1.7.0 / 08e8bc869d5d727d3862997176a137275f349869.

Validation

• python3 tools/verify_gpu_fixture_provenance.py passed.
• python3 tools/verify_gpu_fixture_bytes.py passed (47 inputs).
• python3 -m unittest -v tools.tests.test_movement_fixture tools.tests.test_gpu_fixture_bytes tools.tests.test_gpu_fixture_provenance tools.tests.test_verify_gpu_qualification passed (37 tests).
• ./atrinik build all --profile scope-issue489-fixture-depths-20260904 --test compiled the Classic stack; targeted client-gpu-fixture-provenance passed.
• Exact v1.7.0 staged-content provenance passed.
• The Linux container has no supported GPU, so GPU production tests were skipped. Aggregate CTest also retained three unrelated environment/runtime failures: client-window-title, server-unit-toolkit.socket_asset, and server-assetspath-migration.

Limitations / follow-up

The post-fix wire workload JSON was not generated in the headless Linux container. Native Windows GPU qualification should be rerun at this PR head; no renderer or guard changes are included.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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