XY-881: [ELF benchmark P1] Pin Docker cold-start embedding dependency blockers

[yvette-carlisle]

Summary

• Pin the OpenViking Docker local embedding dependency path to llama-cpp-python==0.3.28 from the CPU wheel index with binary-only install before .[local-embed].
• Preserve install/import/setup failures as incomplete, while classifying reached add_resource/find evidence misses as wrong_result/retrieval_wrong_result.
• Refresh production-ops fixtures, external adapter manifest, report docs, README claims, and benchmark tests for the new boundary.

Verification

• jq empty apps/elf-eval/fixtures/real_world_memory/production_ops/cold_start_missing_dependency_incomplete.json apps/elf-eval/fixtures/real_world_external_adapters/memory_projects_manifest.json
• bash -n scripts/live-baseline-benchmark.sh
• docker compose -f docker-compose.baseline.yml config
• ELF_BASELINE_PROJECTS=OpenViking cargo make baseline-live-docker
• cargo make real-world-memory-production-ops
• cargo make real-world-memory
• cargo test -p elf-eval --test real_world_job_benchmark
• cargo make fmt
• cargo make lint-fix
• cargo make checks