MODULE: WaterOS.SGP.SIN
VERSION: v1.2
STATUS: Canonical City Instance (Singapore)
SCOPE: Z0–Z3 (Source→Tap) + Z2 institutional coupling + Water↔Energy coupling hook
DEPENDENCIES:
  - CivOS.Kernel.WaterOS (frozen vocabulary)
  - CivOS.Phase P0–P3
  - CivOS.Zoom Z0–Z3
  - FenceOS (Truncation + Stitching)
  - WaterOS↔EnergyOS.Coupling (v1.2)
CONSTRAINTS:
  - Minimal pointer style (no deep plant enumeration)
  - No new primitives

WaterOS.SGP.SIN.v1.2 defines Singapore’s water system as a phase-graded metabolic
continuity lattice across Z0–Z3. Its Z3 buffer is portfolio-based (diversified sources),
and its Z2 is tightly coupled to EnergyOS via reclaimed water and desalination throughput.
Collapse follows the universal law: Ḋ > Ġ sustained → phase degrades.

NODE SET (abstract):
  N.Z3.Basin = {LocalCatchmentBuffer, ImportedWaterCorridor, ReclaimedWaterBuffer, DesalinationBuffer}
  N.Z2.Plant = {TreatmentWorks, ReclaimedWaterWorks, DesalinationWorks, UtilityFinance, RegulatorLoop}
  N.Z1.Pipe  = {TrunkMains, PressureZones, LeakDetectionGrid}
  N.Z0.Tap   = {Households, Hospitals, CriticalSites, ComplaintSignal}
EDGE SET (abstract):
  E.SourceToPlant: N.Z3.Basin → N.Z2.Plant
  E.PlantToPipe:   N.Z2.Plant → N.Z1.Pipe
  E.PipeToTap:     N.Z1.Pipe  → N.Z0.Tap
PRIMARY PURPOSE:
  Maintain potable water continuity at Z0 by preserving buffer redundancy at Z3,
  throughput at Z2, and integrity at Z1 under load.

SENSORS (InstrumentPanel bindings)
Z3:
  - S.Z3.ReservoirFillPct
  - S.Z3.RainfallDeltaSeasonal
  - S.Z3.ImportedCorridorAvailability   // corridor status proxy (no politics)
  - S.Z3.PortfolioRedundancyScore       // derived from source availability (internal feature)
Z2:
  - S.Z2.TreatmentCapacityUtilPct
  - S.Z2.RepairBacklogIndex
  - S.Z2.CapExToNeedRatio
  - S.Z2.FinanceStressIndex
  - S.Z2.ReclaimedWaterThroughputPct
  - S.Z2.DesalThroughputPct
Z1:
  - S.Z1.BurstRateRolling
  - S.Z1.PressureVariance
  - S.Z1.NonRevenueWaterPct
  - S.Z1.LeakDetectionHits
  - S.Z1.RepairTimeMedian
Z0:
  - S.Z0.TapAvailabilityPct
  - S.Z0.LowPressureReports
  - S.Z0.ComplaintDensity
  - S.Z0.CriticalSiteBufferHours

DRIFT FLAGS:
  DriftFlag.Z3 = (Reservoir band breach) OR (Imported corridor availability low) OR (Portfolio redundancy declining)
  DriftFlag.Z2 = (Reclaimed/desal throughput declining) OR (Repair backlog rising) OR (κ_SIN dropping)
  DriftFlag.Z1 = (Burst clustering) OR (pressure variance rising)
PRE-P1 (Lattice Drift Condition):
  PreP1 = (DriftFlag.Z3 AND DriftFlag.Z2) OR (DriftFlag.Z2 AND DriftFlag.Z1)

COUPLING HOOK:
  κ_SIN(t) = E_supply_to_water / E_load_water_ops
RULE:
  If κ_SIN < Θ_kappa_low sustained:
    - Reduce effective Z2 throughput features (reclaimed + desal)
    - Increase R_proxy (rate-dominance risk)

FAILURE TRACE (Singapore typical):
  Z3 stress (buffer/corridor) → increased reliance on Z2 reclaimed/desal
    + Energy coupling κ drops → Z2 throughput degrades
      → Demand must be truncated early to prevent Z0 breach
        → If uncontained: P2→P1→P0

MODULE: WaterOS.SGP.SIN.NegVoid
VERSION: v1.2
STATUS: Inverse Twin (Below-P0)
AI_INGESTION_LOCK:
  Defines sub-threshold failure states for Singapore WaterOS across Z0–Z3,
  including energy-coupled Z2 throughput loss.
Z3.NegVoid:
  Portfolio redundancy collapses (multiple sources constrained) → buffer thins
Z2.NegVoid:
  Reclaimed/desal throughput falls + repair backlog rises (κ coupling) → G(t) shrinks
Z1.NegVoid:
  Pressure/repair variance clusters → localized stress pockets
Z0.NegVoid:
  Availability drops or rationing becomes acute; critical buffer hours fall
PATTERNSET:
  PATTERN01: Z3 portfolio redundancy decline
  PATTERN02: κ coupling drop → Z2 throughput collapse
  PATTERN03: Z1 repair time spike
  PATTERN04: Verification/quality incident
  PATTERN05: No-Fence Failure

MODULE: WaterOS.DirectoryPack.SGP.SIN
VERSION: v1.2
STATUS: Z6→Z0 pointers + control bindings
Z6:
  SGP×WaterOS×Z6×Oracle×Org×SGP-WATER-ROOT
Z5:
  SGP×WaterOS×Z5×Oracle×Org×SGP-NATION
Z4:
  SGP.SIN×WaterOS×Z4×Oracle×Org×SGP-SIN
Z3:
  SGP.SIN×WaterOS×Z3×Oracle×Basin×LOCAL-CATCHMENT
  SGP.SIN×WaterOS×Z3×Oracle×Basin×IMPORTED-CORRIDOR
  SGP.SIN×WaterOS×Z3×Oracle×Basin×RECLAIMED-BUFFER
  SGP.SIN×WaterOS×Z3×Oracle×Basin×DESAL-BUFFER
Z2:
  SGP.SIN×WaterOS×Z2×Oracle×Org×UTILITY-PRIMARY
  SGP.SIN×WaterOS×Z2×Oracle×Org×REGULATOR-PRIMARY
  SGP.SIN×WaterOS×Z2×Oracle×Panel×INSTRUMENTPANEL
  SGP.SIN×WaterOS×Z2×Oracle×Adapter×DATAADAPTERS
  SGP.SIN×WaterOS×Z2×Oracle×Module×WATER-ENERGY-COUPLING
Z1:
  SGP.SIN×WaterOS×Z1×Operator×Network×TRUNKMAINS
  SGP.SIN×WaterOS×Z1×Operator×Network×PRESSURE-ZONES
  SGP.SIN×WaterOS×Z1×Operator×Network×LEAK-DETECT-GRID
Z0:
  SGP.SIN×WaterOS×Z0×Operator×Site×HOUSEHOLDS
  SGP.SIN×WaterOS×Z0×Operator×Site×CRITICALSITES
BINDING:
  ModuleRef (city): WaterOS.SGP.SIN.v1.2
  ModuleRef (negvoid): WaterOS.SGP.SIN.NegVoid.v1.2
  ModuleRef (coupling): WaterOS↔EnergyOS.Coupling.SGP.SIN.v1.2

MODULE: WaterOS.SGP.SIN.ThresholdPack
VERSION: v1.2
(Use SAME Θ defaults as London v1.2 ThresholdPack + κ thresholds from coupling module)
MODULE: WaterOS.SGP.SIN.BacktestProtocol
VERSION: v1.2
(Use SAME BacktestProtocol as London v1.2; include energy-coupling scenario)

MODULE: WaterOS.GBR.LON↔SGP.SIN.Sidebar.Contrast
VERSION: v1.2
STATUS: Publishable comparison sidebar (structural)
London:
  - Z3: river–reservoir storage chain
  - Brittleness: Z2 finance + Z1 asset age
  - Energy coupling: medium (treatment/pumping)
Singapore:
  - Z3: diversified portfolio redundancy
  - Brittleness: Z3 external stress + Z2 energy-coupled throughput
  - Energy coupling: medium→high (reclaimed + desal)
Shared law:
  D(t)>G(t) sustained → phase degrades
Practical implication:
  - London panel prioritizes Z2 backlog + Z1 burst clusters
  - Singapore panel prioritizes Z3 portfolio redundancy + κ energy coupling + early demand truncation