FAILURE MAP
← Case archive

FA-86301 / Game economy crafting balance / Open access

Crafting station queue: Station free time forgets queued work · case 01

Consecutive jobs on one station overlap.

Verified by executionVariant 1 · 8 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The station free time is set to the job duration alone.

VERIFIED REPAIR

Restore `free[s] = start + d` at the station release step.

Unsuccessful approach: Using the unsped duration ignores the speed bonus.

Case contract

jobs = [[name, duration], ...] in queue order. Effective duration = max(1, floor(duration*(100-speed)/100)). Each job starts on the station that frees earliest (lowest index on ties) at that station free time. Return names of jobs finished by now (finish <= now) ordered by finish time then queue position.

Why this case matters

Game economies leak or destroy currency when one crafting or pricing rule is off by one boundary, rounding stage or state update; the defect is observable in exact integer outcomes.

1 / The failure

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(jobs, stations, speed, now):
    free = [0] * stations
    done = []
    for idx, (name, dur) in enumerate(jobs):
        d = max(1, dur * (100 - speed) // 100)
        s = min(range(stations), key=lambda k: (free[k], k))
        start = free[s]
        free[s] = d
        done.append((free[s], idx, name))
    return [name for fin, idx, name in sorted(done) if fin <= now]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
cases = [[('two stations tie #1', [[['a', 10], ['b', 10], ['c', 5]], 2, 0, 15], ['a', 'b', 'c']),
  ('fault site station release #1',
   [[['flask', 1], ['cape', 60], ['ember', 1], ['bow', 1], ['anvil', 2], ['dagger', 33]], 2, 25, 1],
   ['flask']),
  ('fault site station release #2',
   [[['dagger', 10], ['bow', 119], ['cape', 1], ['flask', 2], ['ember', 60], ['anvil', 5]], 1, 0, 60],
   ['dagger']),
  ('partial repair boundary #1',
   [[['dagger', 60], ['flask', 1], ['anvil', 60], ['cape', 1], ['ember', 5], ['bow', 33]], 1, 99, 154],
   ['dagger', 'flask', 'anvil', 'cape', 'ember', 'bow']),
  ('partial repair boundary #2', [[['anvil', 2]], 3, 90, 1], ['anvil']),
  ('speed floor #1', [[['x', 1], ['y', 1]], 1, 90, 2], ['x', 'y']),
  ('finish exactly now #1', [[['a', 30]], 1, 0, 30], ['a']),
  ('control #1',
   [[['flask', 2], ['bow', 10], ['cape', 1], ['dagger', 2], ['anvil', 10], ['ember', 10]], 2, 10, 5],
   ['flask', 'cape', 'dagger'])],
 [('two stations tie #1', [[['a', 10], ['b', 10], ['c', 5]], 2, 0, 15], ['a', 'b', 'c']),
  ('fault site station release #1',
   [[['dagger', 10], ['bow', 119], ['cape', 1], ['flask', 2], ['ember', 60], ['anvil', 5]], 1, 0, 60],
   ['dagger']),
  ('regression station release #1', [[['anvil', 2], ['dagger', 2], ['flask', 5]], 1, 90, 1], ['anvil']),
  ('regression station release #2', [[['anvil', 5], ['dagger', 10], ['cape', 1]], 1, 90, 1], ['anvil']),
  ('partial repair boundary #1', [[['flask', 10], ['bow', 60]], 1, 90, 5], ['flask']),
  ('speed floor #1', [[['x', 1], ['y', 1]], 1, 90, 2], ['x', 'y']),
  ('finish exactly now #1', [[['a', 30]], 1, 0, 30], ['a']),
  ('control #1',
   [[['flask', 2], ['bow', 10], ['cape', 1], ['dagger', 2], ['anvil', 10], ['ember', 10]], 2, 10, 5],
   ['flask', 'cape', 'dagger'])],
 [('two stations tie #1', [[['a', 10], ['b', 10], ['c', 5]], 2, 0, 15], ['a', 'b', 'c']),
  ('regression station release #1', [[['anvil', 5], ['dagger', 10], ['cape', 1]], 1, 90, 1], ['anvil']),
  ('fault site station release #1',
   [[['bow', 100], ['ember', 2], ['flask', 5], ['dagger', 60]], 1, 0, 30],
   []),
  ('partial repair boundary #1', [[['flask', 10], ['bow', 60]], 1, 90, 5], ['flask']),
  ('partial repair boundary #2',
   [[['flask', 115], ['bow', 60], ['dagger', 19], ['anvil', 96], ['ember', 93], ['cape', 60]], 1, 99, 137],
   ['flask', 'bow', 'dagger', 'anvil', 'ember', 'cape']),
  ('speed floor #1', [[['x', 1], ['y', 1]], 1, 90, 2], ['x', 'y']),
  ('finish exactly now #1', [[['a', 30]], 1, 0, 30], ['a']),
  ('control #1',
   [[['flask', 2], ['bow', 10], ['cape', 1], ['dagger', 2], ['anvil', 10], ['ember', 10]], 2, 10, 5],
   ['flask', 'cape', 'dagger'])],
 [('two stations tie #1', [[['a', 10], ['b', 10], ['c', 5]], 2, 0, 15], ['a', 'b', 'c']),
  ('fault site station release #1',
   [[['dagger', 60], ['bow', 84], ['flask', 60], ['ember', 1], ['cape', 10]], 2, 25, 30],
   []),
  ('fault site station release #2',
   [[['cape', 1], ['dagger', 73], ['bow', 1], ['anvil', 2], ['flask', 5], ['ember', 32]], 2, 0, 5],
   ['cape', 'bow', 'anvil']),
  ('regression station release #1',
   [[['anvil', 2], ['cape', 60], ['bow', 5], ['ember', 1]], 2, 50, 5],
   ['anvil', 'bow', 'ember']),
  ('regression station release #2',
   [[['ember', 1], ['cape', 60], ['bow', 60], ['anvil', 10], ['dagger', 5]], 1, 90, 60],
   ['ember', 'cape', 'bow', 'anvil', 'dagger']),
  ('speed floor #1', [[['x', 1], ['y', 1]], 1, 90, 2], ['x', 'y']),
  ('finish exactly now #1', [[['a', 30]], 1, 0, 30], ['a']),
  ('control #1',
   [[['anvil', 2], ['flask', 2], ['cape', 1], ['dagger', 103], ['ember', 5]], 2, 10, 60],
   ['anvil', 'flask', 'cape', 'ember'])],
 [('two stations tie #1', [[['a', 10], ['b', 10], ['c', 5]], 2, 0, 15], ['a', 'b', 'c']),
  ('regression station release #1',
   [[['anvil', 2], ['cape', 60], ['bow', 5], ['ember', 1]], 2, 50, 5],
   ['anvil', 'bow', 'ember']),
  ('fault site station release #1',
   [[['flask', 5], ['bow', 10], ['anvil', 1], ['dagger', 2], ['cape', 78]], 2, 50, 208],
   ['flask', 'anvil', 'dagger', 'bow', 'cape']),
  ('partial repair boundary #1', [[['ember', 2], ['cape', 5]], 1, 10, 5], ['ember', 'cape']),
  ('partial repair boundary #2',
   [[['ember', 2], ['anvil', 5], ['cape', 2]], 3, 90, 293],
   ['ember', 'anvil', 'cape']),
  ('speed floor #1', [[['x', 1], ['y', 1]], 1, 90, 2], ['x', 'y']),
  ('finish exactly now #1', [[['a', 30]], 1, 0, 30], ['a']),
  ('control #1', [[['dagger', 1], ['bow', 5]], 1, 99, 161], ['dagger', 'bow'])]]
for label, args, expected in cases[N-1]:
    check(label, solve(*args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
two stations tie #1['c', 'a', 'b']['a', 'b', 'c']Failed
fault site station release #1['flask', 'ember', 'bow', 'anvil']['flask']Failed
fault site station release #2['cape', 'flask', 'anvil', 'dagger', 'ember']['dagger']Failed
partial repair boundary #1['dagger', 'flask', 'anvil', 'cape', 'ember', 'bow']['dagger', 'flask', 'anvil', 'cape', 'ember', 'bow']Passed
partial repair boundary #2['anvil']['anvil']Passed
speed floor #1['x', 'y']['x', 'y']Passed
finish exactly now #1['a']['a']Passed
control #1['flask', 'cape', 'dagger']['flask', 'cape', 'dagger']Passed

SHA-256 / 86cf05e0b144b2c1e8c08384b6f192fc5919301e5fe33a256d6b4a683337db59

2 / The unsuccessful fix

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(jobs, stations, speed, now):
    free = [0] * stations
    done = []
    for idx, (name, dur) in enumerate(jobs):
        d = max(1, dur * (100 - speed) // 100)
        s = min(range(stations), key=lambda k: (free[k], k))
        start = free[s]
        free[s] = start + dur
        done.append((free[s], idx, name))
    return [name for fin, idx, name in sorted(done) if fin <= now]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
cases = [[('two stations tie #1', [[['a', 10], ['b', 10], ['c', 5]], 2, 0, 15], ['a', 'b', 'c']),
  ('fault site station release #1',
   [[['flask', 1], ['cape', 60], ['ember', 1], ['bow', 1], ['anvil', 2], ['dagger', 33]], 2, 25, 1],
   ['flask']),
  ('fault site station release #2',
   [[['dagger', 10], ['bow', 119], ['cape', 1], ['flask', 2], ['ember', 60], ['anvil', 5]], 1, 0, 60],
   ['dagger']),
  ('partial repair boundary #1',
   [[['dagger', 60], ['flask', 1], ['anvil', 60], ['cape', 1], ['ember', 5], ['bow', 33]], 1, 99, 154],
   ['dagger', 'flask', 'anvil', 'cape', 'ember', 'bow']),
  ('partial repair boundary #2', [[['anvil', 2]], 3, 90, 1], ['anvil']),
  ('speed floor #1', [[['x', 1], ['y', 1]], 1, 90, 2], ['x', 'y']),
  ('finish exactly now #1', [[['a', 30]], 1, 0, 30], ['a']),
  ('control #1',
   [[['flask', 2], ['bow', 10], ['cape', 1], ['dagger', 2], ['anvil', 10], ['ember', 10]], 2, 10, 5],
   ['flask', 'cape', 'dagger'])],
 [('two stations tie #1', [[['a', 10], ['b', 10], ['c', 5]], 2, 0, 15], ['a', 'b', 'c']),
  ('fault site station release #1',
   [[['dagger', 10], ['bow', 119], ['cape', 1], ['flask', 2], ['ember', 60], ['anvil', 5]], 1, 0, 60],
   ['dagger']),
  ('regression station release #1', [[['anvil', 2], ['dagger', 2], ['flask', 5]], 1, 90, 1], ['anvil']),
  ('regression station release #2', [[['anvil', 5], ['dagger', 10], ['cape', 1]], 1, 90, 1], ['anvil']),
  ('partial repair boundary #1', [[['flask', 10], ['bow', 60]], 1, 90, 5], ['flask']),
  ('speed floor #1', [[['x', 1], ['y', 1]], 1, 90, 2], ['x', 'y']),
  ('finish exactly now #1', [[['a', 30]], 1, 0, 30], ['a']),
  ('control #1',
   [[['flask', 2], ['bow', 10], ['cape', 1], ['dagger', 2], ['anvil', 10], ['ember', 10]], 2, 10, 5],
   ['flask', 'cape', 'dagger'])],
 [('two stations tie #1', [[['a', 10], ['b', 10], ['c', 5]], 2, 0, 15], ['a', 'b', 'c']),
  ('regression station release #1', [[['anvil', 5], ['dagger', 10], ['cape', 1]], 1, 90, 1], ['anvil']),
  ('fault site station release #1',
   [[['bow', 100], ['ember', 2], ['flask', 5], ['dagger', 60]], 1, 0, 30],
   []),
  ('partial repair boundary #1', [[['flask', 10], ['bow', 60]], 1, 90, 5], ['flask']),
  ('partial repair boundary #2',
   [[['flask', 115], ['bow', 60], ['dagger', 19], ['anvil', 96], ['ember', 93], ['cape', 60]], 1, 99, 137],
   ['flask', 'bow', 'dagger', 'anvil', 'ember', 'cape']),
  ('speed floor #1', [[['x', 1], ['y', 1]], 1, 90, 2], ['x', 'y']),
  ('finish exactly now #1', [[['a', 30]], 1, 0, 30], ['a']),
  ('control #1',
   [[['flask', 2], ['bow', 10], ['cape', 1], ['dagger', 2], ['anvil', 10], ['ember', 10]], 2, 10, 5],
   ['flask', 'cape', 'dagger'])],
 [('two stations tie #1', [[['a', 10], ['b', 10], ['c', 5]], 2, 0, 15], ['a', 'b', 'c']),
  ('fault site station release #1',
   [[['dagger', 60], ['bow', 84], ['flask', 60], ['ember', 1], ['cape', 10]], 2, 25, 30],
   []),
  ('fault site station release #2',
   [[['cape', 1], ['dagger', 73], ['bow', 1], ['anvil', 2], ['flask', 5], ['ember', 32]], 2, 0, 5],
   ['cape', 'bow', 'anvil']),
  ('regression station release #1',
   [[['anvil', 2], ['cape', 60], ['bow', 5], ['ember', 1]], 2, 50, 5],
   ['anvil', 'bow', 'ember']),
  ('regression station release #2',
   [[['ember', 1], ['cape', 60], ['bow', 60], ['anvil', 10], ['dagger', 5]], 1, 90, 60],
   ['ember', 'cape', 'bow', 'anvil', 'dagger']),
  ('speed floor #1', [[['x', 1], ['y', 1]], 1, 90, 2], ['x', 'y']),
  ('finish exactly now #1', [[['a', 30]], 1, 0, 30], ['a']),
  ('control #1',
   [[['anvil', 2], ['flask', 2], ['cape', 1], ['dagger', 103], ['ember', 5]], 2, 10, 60],
   ['anvil', 'flask', 'cape', 'ember'])],
 [('two stations tie #1', [[['a', 10], ['b', 10], ['c', 5]], 2, 0, 15], ['a', 'b', 'c']),
  ('regression station release #1',
   [[['anvil', 2], ['cape', 60], ['bow', 5], ['ember', 1]], 2, 50, 5],
   ['anvil', 'bow', 'ember']),
  ('fault site station release #1',
   [[['flask', 5], ['bow', 10], ['anvil', 1], ['dagger', 2], ['cape', 78]], 2, 50, 208],
   ['flask', 'anvil', 'dagger', 'bow', 'cape']),
  ('partial repair boundary #1', [[['ember', 2], ['cape', 5]], 1, 10, 5], ['ember', 'cape']),
  ('partial repair boundary #2',
   [[['ember', 2], ['anvil', 5], ['cape', 2]], 3, 90, 293],
   ['ember', 'anvil', 'cape']),
  ('speed floor #1', [[['x', 1], ['y', 1]], 1, 90, 2], ['x', 'y']),
  ('finish exactly now #1', [[['a', 30]], 1, 0, 30], ['a']),
  ('control #1', [[['dagger', 1], ['bow', 5]], 1, 99, 161], ['dagger', 'bow'])]]
for label, args, expected in cases[N-1]:
    check(label, solve(*args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
two stations tie #1['a', 'b', 'c']['a', 'b', 'c']Passed
fault site station release #1['flask']['flask']Passed
fault site station release #2['dagger']['dagger']Passed
partial repair boundary #1['dagger', 'flask', 'anvil', 'cape', 'ember']['dagger', 'flask', 'anvil', 'cape', 'ember', 'bow']Failed
partial repair boundary #2[]['anvil']Failed
speed floor #1['x', 'y']['x', 'y']Passed
finish exactly now #1['a']['a']Passed
control #1['flask', 'cape', 'dagger']['flask', 'cape', 'dagger']Passed

SHA-256 / 7b0b6d8b8ca8797696bb8abe0d4713dab42649c3c26347258b0e20709fe4568e

3 / The verified repair

Exit 0
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(jobs, stations, speed, now):
    free = [0] * stations
    done = []
    for idx, (name, dur) in enumerate(jobs):
        d = max(1, dur * (100 - speed) // 100)
        s = min(range(stations), key=lambda k: (free[k], k))
        start = free[s]
        free[s] = start + d
        done.append((free[s], idx, name))
    return [name for fin, idx, name in sorted(done) if fin <= now]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
cases = [[('two stations tie #1', [[['a', 10], ['b', 10], ['c', 5]], 2, 0, 15], ['a', 'b', 'c']),
  ('fault site station release #1',
   [[['flask', 1], ['cape', 60], ['ember', 1], ['bow', 1], ['anvil', 2], ['dagger', 33]], 2, 25, 1],
   ['flask']),
  ('fault site station release #2',
   [[['dagger', 10], ['bow', 119], ['cape', 1], ['flask', 2], ['ember', 60], ['anvil', 5]], 1, 0, 60],
   ['dagger']),
  ('partial repair boundary #1',
   [[['dagger', 60], ['flask', 1], ['anvil', 60], ['cape', 1], ['ember', 5], ['bow', 33]], 1, 99, 154],
   ['dagger', 'flask', 'anvil', 'cape', 'ember', 'bow']),
  ('partial repair boundary #2', [[['anvil', 2]], 3, 90, 1], ['anvil']),
  ('speed floor #1', [[['x', 1], ['y', 1]], 1, 90, 2], ['x', 'y']),
  ('finish exactly now #1', [[['a', 30]], 1, 0, 30], ['a']),
  ('control #1',
   [[['flask', 2], ['bow', 10], ['cape', 1], ['dagger', 2], ['anvil', 10], ['ember', 10]], 2, 10, 5],
   ['flask', 'cape', 'dagger'])],
 [('two stations tie #1', [[['a', 10], ['b', 10], ['c', 5]], 2, 0, 15], ['a', 'b', 'c']),
  ('fault site station release #1',
   [[['dagger', 10], ['bow', 119], ['cape', 1], ['flask', 2], ['ember', 60], ['anvil', 5]], 1, 0, 60],
   ['dagger']),
  ('regression station release #1', [[['anvil', 2], ['dagger', 2], ['flask', 5]], 1, 90, 1], ['anvil']),
  ('regression station release #2', [[['anvil', 5], ['dagger', 10], ['cape', 1]], 1, 90, 1], ['anvil']),
  ('partial repair boundary #1', [[['flask', 10], ['bow', 60]], 1, 90, 5], ['flask']),
  ('speed floor #1', [[['x', 1], ['y', 1]], 1, 90, 2], ['x', 'y']),
  ('finish exactly now #1', [[['a', 30]], 1, 0, 30], ['a']),
  ('control #1',
   [[['flask', 2], ['bow', 10], ['cape', 1], ['dagger', 2], ['anvil', 10], ['ember', 10]], 2, 10, 5],
   ['flask', 'cape', 'dagger'])],
 [('two stations tie #1', [[['a', 10], ['b', 10], ['c', 5]], 2, 0, 15], ['a', 'b', 'c']),
  ('regression station release #1', [[['anvil', 5], ['dagger', 10], ['cape', 1]], 1, 90, 1], ['anvil']),
  ('fault site station release #1',
   [[['bow', 100], ['ember', 2], ['flask', 5], ['dagger', 60]], 1, 0, 30],
   []),
  ('partial repair boundary #1', [[['flask', 10], ['bow', 60]], 1, 90, 5], ['flask']),
  ('partial repair boundary #2',
   [[['flask', 115], ['bow', 60], ['dagger', 19], ['anvil', 96], ['ember', 93], ['cape', 60]], 1, 99, 137],
   ['flask', 'bow', 'dagger', 'anvil', 'ember', 'cape']),
  ('speed floor #1', [[['x', 1], ['y', 1]], 1, 90, 2], ['x', 'y']),
  ('finish exactly now #1', [[['a', 30]], 1, 0, 30], ['a']),
  ('control #1',
   [[['flask', 2], ['bow', 10], ['cape', 1], ['dagger', 2], ['anvil', 10], ['ember', 10]], 2, 10, 5],
   ['flask', 'cape', 'dagger'])],
 [('two stations tie #1', [[['a', 10], ['b', 10], ['c', 5]], 2, 0, 15], ['a', 'b', 'c']),
  ('fault site station release #1',
   [[['dagger', 60], ['bow', 84], ['flask', 60], ['ember', 1], ['cape', 10]], 2, 25, 30],
   []),
  ('fault site station release #2',
   [[['cape', 1], ['dagger', 73], ['bow', 1], ['anvil', 2], ['flask', 5], ['ember', 32]], 2, 0, 5],
   ['cape', 'bow', 'anvil']),
  ('regression station release #1',
   [[['anvil', 2], ['cape', 60], ['bow', 5], ['ember', 1]], 2, 50, 5],
   ['anvil', 'bow', 'ember']),
  ('regression station release #2',
   [[['ember', 1], ['cape', 60], ['bow', 60], ['anvil', 10], ['dagger', 5]], 1, 90, 60],
   ['ember', 'cape', 'bow', 'anvil', 'dagger']),
  ('speed floor #1', [[['x', 1], ['y', 1]], 1, 90, 2], ['x', 'y']),
  ('finish exactly now #1', [[['a', 30]], 1, 0, 30], ['a']),
  ('control #1',
   [[['anvil', 2], ['flask', 2], ['cape', 1], ['dagger', 103], ['ember', 5]], 2, 10, 60],
   ['anvil', 'flask', 'cape', 'ember'])],
 [('two stations tie #1', [[['a', 10], ['b', 10], ['c', 5]], 2, 0, 15], ['a', 'b', 'c']),
  ('regression station release #1',
   [[['anvil', 2], ['cape', 60], ['bow', 5], ['ember', 1]], 2, 50, 5],
   ['anvil', 'bow', 'ember']),
  ('fault site station release #1',
   [[['flask', 5], ['bow', 10], ['anvil', 1], ['dagger', 2], ['cape', 78]], 2, 50, 208],
   ['flask', 'anvil', 'dagger', 'bow', 'cape']),
  ('partial repair boundary #1', [[['ember', 2], ['cape', 5]], 1, 10, 5], ['ember', 'cape']),
  ('partial repair boundary #2',
   [[['ember', 2], ['anvil', 5], ['cape', 2]], 3, 90, 293],
   ['ember', 'anvil', 'cape']),
  ('speed floor #1', [[['x', 1], ['y', 1]], 1, 90, 2], ['x', 'y']),
  ('finish exactly now #1', [[['a', 30]], 1, 0, 30], ['a']),
  ('control #1', [[['dagger', 1], ['bow', 5]], 1, 99, 161], ['dagger', 'bow'])]]
for label, args, expected in cases[N-1]:
    check(label, solve(*args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
two stations tie #1['a', 'b', 'c']['a', 'b', 'c']Passed
fault site station release #1['flask']['flask']Passed
fault site station release #2['dagger']['dagger']Passed
partial repair boundary #1['dagger', 'flask', 'anvil', 'cape', 'ember', 'bow']['dagger', 'flask', 'anvil', 'cape', 'ember', 'bow']Passed
partial repair boundary #2['anvil']['anvil']Passed
speed floor #1['x', 'y']['x', 'y']Passed
finish exactly now #1['a']['a']Passed
control #1['flask', 'cape', 'dagger']['flask', 'cape', 'dagger']Passed

SHA-256 / 2f4c157e394ee0e08449c5de193a2bc1fc43d47e7747828c8970d985f1a2f7e6

Verification & scope

Deterministic toy contract stipulated for this model; integer or exact arithmetic only, not a reproduction of any specific game engine. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.

Observations recorded using Python 3.12.14 at 2026-09-29T14:50:48.266210+00:00.

Case digest / 3b293464cfcccd13ef1d192fe4e10ba4110ac2e428005503829385ada040a267