{
    "category": "Architectural Clusters",
    "tier": "exempt",
    "check": {
        "by": ["the layer and tension join, which places every principle in a cluster and resolves every tension between clusters"],
        "population": "every architecture and lexicon record the membership map places in the cluster",
        "freshness": "a verdict stands until the membership map, the topology or a member record changes",
        "refusal": "the gate fails on a tension with no resolution, or an override that matches no live edge",
        "observation": "none: a cluster is a grouping of principles",
        "evidence": "fires-and-accepts: a suite plants a tension between two principles no layer places, and the bundled tensions resolve with no dead override",
        "authority": "the membership map and the topology, which a tension's resolution is derived from"
    },
    "records": [
        {
            "id": "structural-core",
            "principleRef": "single-source-of-truth",
            "title": "Structural Core",
            "intent": "The architectural rules that preserve structural integrity — a single authoritative source, no shortcuts, no fallbacks, no duplication, no orphaned artifacts.",
            "invariant": "Structure stays sound only when every element has one authoritative home and no debt-incurring escape hatch exists.",
            "flow": [
                "SingleSource",
                "NoShortcut",
                "NoFallback",
                "NoOrphan"
            ],
            "productions": [],
            "composes": [],
            "force": [],
            "meta": true
        },
        {
            "id": "correctness-core",
            "principleRef": "fail-fast",
            "title": "Correctness Core",
            "intent": "The rules ensuring behavioral correctness and validity — no silent failures, no hidden invalidity, feedback acted on, results observed.",
            "invariant": "Correctness holds only when every failure is surfaced and every invalid state is unrepresentable.",
            "flow": [
                "SurfaceFailure",
                "RejectInvalid",
                "ActOnFeedback"
            ],
            "productions": [],
            "composes": [],
            "force": [],
            "meta": true
        },
        {
            "id": "evolution-principles",
            "principleRef": "evolutionary-architecture",
            "title": "Evolution Principles",
            "intent": "The rules governing how a system changes over time — no backward-compat cruft, no deprecation debt, no legacy retention, no 'for now'.",
            "invariant": "The system evolves cleanly only by deleting the superseded rather than accreting compatibility layers.",
            "flow": [
                "Supersede",
                "Delete",
                "NoLegacy"
            ],
            "productions": [],
            "composes": [],
            "force": [],
            "meta": true
        },
        {
            "id": "resource-core",
            "principleRef": "state-isolation",
            "title": "Resource Core",
            "intent": "The rules governing resource lifecycle and ownership — bounded lifetime, single ownership, no leaks, no implicit retention.",
            "invariant": "Every resource has one owner and a bounded lifetime; nothing is retained implicitly.",
            "flow": [
                "Acquire",
                "Own",
                "Bound",
                "Release"
            ],
            "productions": [],
            "composes": [],
            "force": [],
            "meta": true
        },
        {
            "id": "execution-core",
            "principleRef": "controlled-side-effects",
            "title": "Execution Core",
            "intent": "The rules governing execution flow — a single observable path, no deferring, no dual-path branching, nothing unobserved.",
            "invariant": "Execution follows one observable path; nothing runs unobserved or deferred indefinitely.",
            "flow": [
                "SinglePath",
                "Observe",
                "NoDefer"
            ],
            "productions": [],
            "composes": [],
            "force": [],
            "meta": true
        },
        {
            "id": "computation-core",
            "principleRef": "determinism",
            "title": "Computation Core",
            "intent": "The rules governing computation determinism and purity — no mutable shared state, no hidden nondeterminism, reproducible results.",
            "invariant": "A computation is reproducible only when it has no hidden mutable or nondeterministic input.",
            "flow": [
                "Immutable",
                "Deterministic",
                "Reproducible"
            ],
            "productions": [],
            "composes": [],
            "force": [],
            "meta": true
        },
        {
            "id": "security-core",
            "principleRef": "security-by-design",
            "title": "Security Core",
            "intent": "The rules governing security posture — no hardcoded secrets, validated input, least privilege, no insecure fallbacks.",
            "invariant": "The system is secure only when every input is validated and every privilege is least and explicit.",
            "flow": [
                "ValidateInput",
                "LeastPrivilege",
                "NoSecretLeak"
            ],
            "productions": [],
            "composes": [],
            "force": [],
            "meta": true
        },
        {
            "id": "performance-core",
            "principleRef": "performance-engineering",
            "title": "Performance Core",
            "intent": "The rules governing performance discipline — measured optimization, planned capacity, no guesswork.",
            "invariant": "Performance is improved only by measuring first; no optimization is applied unmeasured.",
            "flow": [
                "Measure",
                "Optimize",
                "Verify"
            ],
            "productions": [],
            "composes": [],
            "force": [],
            "meta": true
        },
        {
            "id": "contracts-core",
            "principleRef": "explicit-contracts",
            "title": "Contracts Core",
            "intent": "The rules governing interfaces and contracts — explicit typed boundaries, versioned change, no implicit or breaking contracts.",
            "invariant": "A boundary is safe only when its contract is explicit, typed, and versioned.",
            "flow": [
                "ExplicitContract",
                "TypedBoundary",
                "VersionChange"
            ],
            "productions": [],
            "composes": [],
            "force": [],
            "meta": true
        },
        {
            "id": "causality-core",
            "principleRef": "causality",
            "title": "Causality Core",
            "intent": "The rules governing causal ordering and time — logical ordering, retractable state, no wall-clock dependence.",
            "invariant": "Order is well-defined only through logical causality, never wall-clock assumptions.",
            "flow": [
                "LogicalOrder",
                "Retract",
                "NoWallClock"
            ],
            "productions": [],
            "composes": [],
            "force": [],
            "meta": true
        },
        {
            "id": "declarative-core",
            "principleRef": "declarative-configuration",
            "title": "Declarative Core",
            "intent": "The rules favoring declarative over imperative — declared configuration, separated concerns, no imperative wiring.",
            "invariant": "Behavior is declared as data, not encoded imperatively.",
            "flow": [
                "Declare",
                "Separate",
                "NoImperativeConfig"
            ],
            "productions": [],
            "composes": [],
            "force": [],
            "meta": true
        },
        {
            "id": "extensibility-core",
            "principleRef": "open-closed",
            "title": "Extensibility Core",
            "intent": "The rules governing extension — declarative discovered wiring over hardcoded, no imperative hardcoded registration.",
            "invariant": "The system extends without modification only when wiring is declarative and discovered, not hardcoded.",
            "flow": [
                "DeclareWiring",
                "Discover",
                "Extend"
            ],
            "productions": [],
            "composes": [],
            "force": [],
            "meta": true
        },
        {
            "id": "observability",
            "principleRef": "observability",
            "title": "Observability",
            "intent": "The rules ensuring a system is observable — emitted metrics and signals, no unobserved execution, no opaque runtime.",
            "invariant": "A system is operable only when its behavior is observable through emitted signals.",
            "flow": [
                "Emit",
                "Trace",
                "NoOpaque"
            ],
            "productions": [],
            "composes": [],
            "force": [],
            "meta": true
        },
        {
            "id": "enforcement-core",
            "principleRef": "fitness-functions",
            "title": "Enforcement Core",
            "intent": "The rules ensuring discipline is enforced programmatically — automated gates over convention, no discipline-only reliance.",
            "invariant": "A rule holds only when a gate enforces it; a rule kept by convention alone drifts.",
            "flow": [
                "Gate",
                "Automate",
                "NoConventionOnly"
            ],
            "productions": [],
            "composes": [],
            "force": [],
            "meta": true
        },
        {
            "id": "atomic-boundary",
            "principleRef": "atomicity",
            "canon": ["atomic-boundary"],
            "title": "Atomic Boundary",
            "intent": "The rules governing atomicity — a transactional boundary that fully commits or fully rolls back, no partial commit, no deferring within.",
            "invariant": "A boundary either fully commits or fully rolls back; no partial state escapes.",
            "flow": [
                "Begin",
                "AllOrNothing",
                "Commit"
            ],
            "productions": [],
            "composes": [],
            "force": [],
            "meta": true
        },
        {
            "id": "human-factors",
            "principleRef": "principle-of-least-surprise",
            "title": "Human Factors",
            "intent": "The rules governing human ergonomics — bounded cognitive complexity, acted-on feedback, explicit approval, no unlimited options.",
            "invariant": "A system is usable only when its cognitive load is bounded and its decisions are approved and reversible.",
            "flow": [
                "BoundComplexity",
                "Approve",
                "ActOnFeedback"
            ],
            "productions": [],
            "composes": [],
            "force": [],
            "meta": true
        },
        {
            "id": "domain-modeling",
            "principleRef": "bounded-context",
            "title": "Domain Modeling",
            "intent": "The rules governing domain boundaries — bounded contexts, ubiquitous language, no leaky context.",
            "invariant": "A domain model stays coherent only when its context boundaries do not leak.",
            "flow": [
                "BoundContext",
                "NoLeak",
                "UbiquitousLanguage"
            ],
            "productions": [],
            "composes": [],
            "force": [],
            "meta": true
        },
        {
            "id": "design-patterns-core",
            "principleRef": "first-principles-design",
            "title": "Design Patterns Core",
            "intent": "The rules governing design-pattern use — patterns applied only to demonstrated recurrence, no speculative pattern application.",
            "invariant": "A pattern is warranted only by demonstrated recurrence, never speculation.",
            "flow": [
                "ObserveRecurrence",
                "ApplyPattern",
                "NoSpeculation"
            ],
            "productions": [],
            "composes": [],
            "force": [],
            "meta": true
        },
        {
            "id": "state-pattern",
            "title": "State Pattern",
            "principleRef": "state-pattern",
            "exemplar": {
                "before": "State-dependent behavior scattered as if/else conditionals on a status flag.",
                "after": "define state objects → delegate behavior to the current-state object → transition replaces the conditional branching",
                "lang": "flow",
                "medium": "composite"
            },
            "intent": "The State design pattern — encapsulate state-dependent behavior in distinct state objects so transitions replace conditional branching.",
            "invariant": "State-dependent behavior is expressed by delegating to a current-state object, not by scattered conditionals.",
            "flow": [
                "DefineStates",
                "DelegateBehavior",
                "Transition"
            ],
            "productions": [],
            "composes": [],
            "force": [],
            "meta": false
        },
        {
            "id": "separation-of-concerns",
            "canon": ["separation-of-concerns"],
            "title": "Separation of Concerns",
            "exemplar": {
                "before": "One module mixes parsing, persistence, and rendering — a change in one ripples through all.",
                "after": "identify concerns → separate each into one place → each concern changes independently",
                "lang": "flow",
                "medium": "composite"
            },
            "intent": "The principle of separating a system into distinct concerns so each is addressed and changed independently.",
            "invariant": "Each concern is localized to one place and changes independently of the others.",
            "flow": [
                "IdentifyConcerns",
                "Separate",
                "IsolateChange"
            ],
            "productions": [],
            "composes": [],
            "force": [],
            "meta": false
        },
        {
            "id": "concurrency-correctness",
            "title": "Concurrency Correctness",
            "exemplar": {
                "before": "Concurrent access with a data race; some interleaving violates the invariant.",
                "after": "model interleavings → prevent races → verify every interleaving preserves the invariants",
                "lang": "flow",
                "medium": "composite"
            },
            "intent": "The rules ensuring correct concurrent behavior — no data races, well-defined interleavings, verified with models such as Petri nets.",
            "invariant": "Concurrent correctness holds only when every interleaving preserves the invariants.",
            "flow": [
                "ModelInterleavings",
                "PreventRaces",
                "Verify"
            ],
            "productions": [],
            "composes": [],
            "force": [],
            "meta": false
        },
        {
            "id": "capacity-planning",
            "title": "Capacity Planning",
            "exemplar": {
                "before": "Capacity guessed, then saturates under production load.",
                "after": "model load → forecast demand → provision from measured/modeled load, not a guess",
                "lang": "flow",
                "medium": "composite"
            },
            "intent": "The activity of forecasting resource demand and provisioning capacity to meet it, informed by queuing theory.",
            "invariant": "Capacity meets demand only when provisioning is derived from measured or modeled load, not guessed.",
            "flow": [
                "ModelLoad",
                "Forecast",
                "Provision"
            ],
            "productions": [],
            "composes": [],
            "force": [],
            "meta": false
        }
    ]
}