{
  "baseline": {
    "limitations": [
      "The legacy jobs used monolithic full-suite collection and are not directly comparable to parallel lane wall-clock completion.",
      "GitHub-hosted runner performance varies; these values document the migration baseline rather than a permanent SLA."
    ],
    "python_jobs_seconds": {
      "3.12": 1980,
      "3.13": 677,
      "3.14": 725
    },
    "source": "GitHub Actions Quality run 30233999210 on pre-lane PR #319 head"
  },
  "evidence_status": "historical-governance-snapshot",
  "historical_snapshot": true,
  "issue": 301,
  "measured_at": "2026-07-27",
  "measurement_scope": "dated-development-measurement-not-portable-performance-guarantee",
  "post_change": {
    "controls": [
      "Every collected item receives exactly one primary lane; unmatched tests enter the explicit default unit lane.",
      "Required benchmark, hardware, external-tool, and native lanes fail when empty or entirely skipped.",
      "Coverage-enabled unit, benchmark, and hardware modules are assigned by measured duration using deterministic greedy balancing.",
      "Python 3.12 lane jobs publish per-shard JUnit, JSON evidence, and parallel coverage fragments.",
      "Python 3.13 and 3.14 run bounded unit and integration compatibility lanes.",
      "Tagged releases execute all six approved lanes with the same configured shard plan and enforce combined critical-runtime coverage."
    ],
    "final_projected_shards_seconds": {
      "unit": {
        "1": 393.673,
        "2": 393.672,
        "3": 393.673
      },
      "benchmark": {
        "1": 305.89,
        "2": 256.941
      },
      "hardware": {
        "1": 66.068,
        "2": 37.993
      }
    },
    "inventory": {
      "benchmark": 325,
      "external_tool": 148,
      "hardware": 748,
      "integration": 711,
      "native": 17,
      "total_tests": 4122,
      "unit": 2173
    },
    "limitations": [
      "Local host timings are diagnostic and hardware-specific; GitHub Actions remains the authoritative CI result.",
      "The first measured shard assignment predates the final duration baseline; the final projected assignment is committed separately in config/test-duration-baseline.json.",
      "Unit shard projections use GitHub Actions JUnit testcase aggregation; actual shard wall time also includes collection and coverage overhead, so job conclusions remain authoritative."
    ],
    "measured_runs": [
      {
        "budget_exceeded": true,
        "budget_seconds": 600,
        "diagnostic": "The coverage-enabled monolithic unit lane motivated the committed three-shard split; all test outcomes were otherwise successful or approved skips.",
        "elapsed_seconds": 1201.445,
        "failed": 0,
        "lane": "unit",
        "passed": 2169,
        "shard": null,
        "skipped": 2,
        "source": "GitHub Actions Quality run 30242034415, artifact test-lane-results-unit",
        "tests": 2171
      },
      {
        "elapsed_seconds": 100.001,
        "failed": 0,
        "lane": "benchmark",
        "modules": [
          "tests/test_convergence_12_families.py"
        ],
        "passed": 27,
        "shard": 1,
        "skipped": 0,
        "tests": 27
      },
      {
        "elapsed_seconds": 402.318,
        "failed": 0,
        "lane": "benchmark",
        "passed": 298,
        "shard": 2,
        "skipped": 0,
        "tests": 298
      },
      {
        "elapsed_seconds": 97.21,
        "failed": 0,
        "lane": "hardware",
        "passed": 363,
        "shard": 1,
        "skipped": 0,
        "tests": 363
      },
      {
        "elapsed_seconds": 37.145,
        "failed": 0,
        "lane": "hardware",
        "passed": 385,
        "shard": 2,
        "skipped": 0,
        "tests": 385
      },
      {
        "elapsed_seconds": 125.739,
        "failed": 0,
        "lane": "hardware",
        "passed": 748,
        "shard": null,
        "skipped": 0,
        "tests": 748
      },
      {
        "failed": 0,
        "module": "tests/test_synthesis_benchmark.py",
        "optimization": "default synthesis corpus computed once per pytest process",
        "passed": 6,
        "skipped": 0,
        "tests": 6,
        "wall_seconds": 305.89
      },
      {
        "elapsed_seconds": 22.896,
        "failed": 0,
        "lane": "external_tool",
        "passed": 148,
        "prerequisites": "ngspice 42 extracted from Ubuntu 24.04 packages; KiCad-dependent contracts remain covered by the dedicated oracle job",
        "shard": null,
        "skipped": 0,
        "tests": 148
      }
    ],
    "measurement_hosts": [
      "ops-vps-4",
      "ops-vps-5",
      "github-hosted-ubuntu-latest"
    ],
    "runtime_budgets_seconds": {
      "benchmark": 900,
      "external_tool": 600,
      "hardware": 900,
      "integration": 900,
      "native": 600,
      "unit": 600
    }
  },
  "schema_version": "1.0"
}