{
  "protocol": {
    "name": "CVP",
    "version": "1.0.0-proposed",
    "revision": "2026-09-13",
    "spec_sha256": "f62725968356c92930531cd6085db76e216da06e95be53d636b0d2cf3218b148",
    "spec": "https://www.calculatorx.com/developers/cvp/spec/1.0"
  },
  "document_status": "proposed",
  "calculator": {
    "id": "cantilever-tip-triangle-partial-load-at",
    "version": "1.0.0",
    "title": "Tip-Peak Triangle, Partial Uniform Load, and Tip Load Calculator",
    "formula_family": "cantilever_tip_triangle_partial_load_at_deflection",
    "capability_id": "mechanical.statics.cantilever_tip_triangle_partial_load_at_deflection"
  },
  "profile": "engineering",
  "status": "STALE",
  "verification_status": "VERIFIED",
  "production_freshness": "STALE",
  "overall_trust": "VERIFIED_STALE",
  "runner": {
    "name": "cvp-runner",
    "version": "1.0.0"
  },
  "environment": {
    "runtime": "node",
    "runtime_version": "20.19.2",
    "numeric_model": "IEEE-754 binary64",
    "os": "darwin"
  },
  "suite": {
    "id": "cantilever-tip-triangle-partial-load-at",
    "version": "1.0.0",
    "uri": "https://www.calculatorx.com/evidence/mechanical.statics.cantilever_tip_triangle_partial_load_at_deflection/1.0.0.json"
  },
  "obligation_set": [
    "CVP-PROV-01",
    "CVP-MODEL-01",
    "CVP-SCOPE-01",
    "CVP-UNIT-01",
    "CVP-REF-01",
    "CVP-GOLD-01",
    "CVP-BND-01",
    "CVP-INV-01",
    "CVP-NUM-01",
    "CVP-COV-01",
    "CVP-CONTRACT-01",
    "CVP-DEP-01",
    "CVP-ART-01",
    "CVP-PROD-01",
    "CVP-DIM-01",
    "CVP-IFACE-01"
  ],
  "provenance": {
    "mode": "direct",
    "sources": [
      {
        "label": "Hibbeler, Mechanics of Materials",
        "kind": "other",
        "reference": "Deflection of beams — superposition"
      },
      {
        "label": "Gere and Goodno, Mechanics of Materials",
        "kind": "other",
        "reference": "Deflection of beams — superposition"
      }
    ]
  },
  "reference": {
    "items": [
      {
        "class": "O1",
        "reference_scope": "model",
        "scope": "model",
        "label": "Tip-Peak Triangle, Partial Uniform Load, and Tip Load Calculator"
      },
      {
        "class": "O2",
        "reference_scope": "expected_values",
        "scope": "expected_values",
        "label": "Separate-module physics-gap oracle — same V8 binary64 as IUT",
        "engine": {
          "name": "physics-gap-reference",
          "precision_bits": 53,
          "independent_of_iut": true
        }
      },
      {
        "class": "O2",
        "reference_scope": "numerical_behavior",
        "scope": "numerical_behavior",
        "label": "Same O2 module backs ≤2 ULP primary-field comparison vs IUT",
        "engine": {
          "name": "physics-gap-reference",
          "precision_bits": 53,
          "independent_of_iut": true
        }
      }
    ],
    "notes": "Golden expected values use a separate O2 module (not IUT transcription). O2 shares Node/V8 binary64 with the IUT unless noted otherwise."
  },
  "controls": {
    "CVP-PROV-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "Sources present on evidence"
    },
    "CVP-MODEL-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "Published closed-form / own Colebrook & Gauss O2"
    },
    "CVP-SCOPE-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "Physics L1 gap capability"
    },
    "CVP-UNIT-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "SI unless noted on the page"
    },
    "CVP-REF-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "O1 model + O2 expected_values + O2 numerical_behavior"
    },
    "CVP-GOLD-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "1/1 legacy golden; 1/1 oracle-backed numeric"
    },
    "CVP-BND-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "1/1 CVP boundary · 1/1 legacy Evidence boundary"
    },
    "CVP-INV-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "1 invalid-domain cases"
    },
    "CVP-NUM-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "max_error_observed_ulp=0; policy declared a priori"
    },
    "CVP-COV-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "2/2 declared partitions (domain, invalid-domain) · 1 legacy golden / 1 CVP boundary unique cases · 1 Evidence invalid-input (may overlap boundary)"
    },
    "CVP-CONTRACT-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "6/6 CVP contract · release-artifacts-aligned=PASS · schema-output-required-declared=PASS · schema-valid-input-executes=PASS · engine-success-output-validates-schema=PASS · schema-rejects-incomplete-input=PASS · rest-success-payload-validates-schema=PASS"
    },
    "CVP-DEP-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "engine cantilever-tip-triangle-partial-load-at; Node binary64"
    },
    "CVP-ART-01": {
      "result": "PASS",
      "applicability": "required",
      "notes": "release_integrity.status=verified · digests: artifact_evidence_sha256=Evidence core (Trust freshness) · cvp_evidence_digest=artifacts.evidence_digest (fingerprint v2) · evidence_bundle_sha256=legacy Evidence JSON bytes · evidence_catalog_digest=attested_catalog_sha256 · production_sha256=bound production report · see artifacts.digest_registry"
    },
    "CVP-PROD-01": {
      "result": "FAIL",
      "applicability": "required",
      "notes": "STALE · site report stale · local checks unknown · attestation_id=5f26825d06766888502f8c66b8e774f1d2c117d79d35add8eac32756335ab114 · Live production: unpublished · Public schema 1.0.0 matches · Semantic contract ✓ · Attestation report not published on origin · schema_const=1.0.0 · attested_evidence_sha256=36b20a13ec97ef1e6a76802f1f86b4d6a2b04374a7d11e4f0d3d10a2308804fa · verified_at=2026-09-25T11:05:17.833Z · evidence_attested_at=2026-09-25T11:05:17.833Z · last_confirmed_current_at=2026-09-25T11:05:17.833Z · rendered_at=2026-09-25T11:05:17.833Z · binds=cvp_core_sha256 · Capability production binding: STALE · Site report: STALE · Evidence changed after the last successful production attestation. Re-attestation required.",
      "check_result": "FAIL",
      "production_state": "STALE",
      "binding_current": false
    },
    "CVP-DIM-01": {
      "result": "PASS",
      "applicability": "applicable",
      "notes": "Primary field delta"
    },
    "CVP-PROP-01": {
      "result": "SKIP",
      "applicability": "not_applicable",
      "notes": "No stated invariants / property suite — control not in obligation set"
    },
    "CVP-META-01": {
      "result": "SKIP",
      "applicability": "not_applicable",
      "notes": "No input→output transformation vectors in pack — control not in obligation set"
    },
    "CVP-ROUND-01": {
      "result": "SKIP",
      "applicability": "not_applicable",
      "notes": "No inverse / round-trip vectors in pack — control not in obligation set"
    },
    "CVP-XCAL-01": {
      "result": "SKIP",
      "applicability": "not_applicable",
      "notes": "No related calculator in the same formula family / no related-identity peers declared — control not in obligation set"
    },
    "CVP-IFACE-01": {
      "result": "PASS",
      "applicability": "applicable",
      "notes": "UI (SSR) · REST · MCP equivalent (MCP uses calc API handler). ui-ssr is query-result HTML, not a live browser session."
    },
    "CVP-ORACLE-01": {
      "result": "SKIP",
      "applicability": "higher_assurance",
      "notes": "O2 present; O3 not required this wave"
    },
    "CVP-EXP-01": {
      "result": "SKIP",
      "applicability": "optional",
      "notes": "named expert review not performed"
    }
  },
  "tests": {
    "golden": {
      "passed": 1,
      "total": 1,
      "failed": 0,
      "case_ids": [
        "g-1"
      ]
    },
    "boundary": {
      "passed": 1,
      "total": 1,
      "failed": 0,
      "case_ids": [
        "boundary-wall"
      ]
    },
    "invalid": {
      "passed": 1,
      "total": 1,
      "failed": 0,
      "case_ids": [
        "boundary-wall"
      ]
    },
    "property": {
      "passed": 0,
      "total": 0,
      "failed": 0,
      "case_ids": []
    },
    "round_trip": {
      "passed": 0,
      "total": 0,
      "failed": 0,
      "case_ids": []
    },
    "metamorphic": {
      "passed": 0,
      "total": 0,
      "failed": 0,
      "case_ids": []
    },
    "contract": {
      "passed": 6,
      "total": 6,
      "failed": 0
    },
    "cross_interface": {
      "passed": 1,
      "total": 1,
      "failed": 0,
      "case_ids": [
        "iface-1"
      ]
    }
  },
  "coverage": {
    "partitions": [
      {
        "id": "domain",
        "description": "Valid domain",
        "exercised": true,
        "case_count": 2
      },
      {
        "id": "invalid-domain",
        "description": "Invalid inputs",
        "exercised": true,
        "case_count": 1
      }
    ]
  },
  "numerical": {
    "representation": "IEEE-754 binary64",
    "tolerance": {
      "type": "ulp",
      "value": 2,
      "rationale": "Published closed forms / own Colebrook & Gauss solvers; ≤2 ULP vs O2. Declared a priori.",
      "declared_before_evaluation": true
    },
    "max_error_observed": 0,
    "records": [
      {
        "id": "g-1",
        "reference": {
          "delta": 170.2,
          "model": "cantilever_tip_triangle_partial_load_at_deflection"
        },
        "actual": {
          "model": "cantilever_tip_triangle_partial_load_at_deflection",
          "w0": 24,
          "w": 24,
          "a": 1,
          "P": 48,
          "x": 2,
          "L": 2,
          "E": 1,
          "I": 1,
          "delta": 170.2,
          "solver": "tip-peak triangle plus a partial uniform load plus a tip load at a station",
          "convention": "Cantilever with a tip-peak triangle, a uniform load w from the wall to a, and a tip load P. Deflection at x is the sum of those curves. x = L is the sum of the partial-triangle tip page and the tip-load page."
        },
        "error_ulp": 0,
        "threshold_ulp": 2,
        "suite": "golden"
      }
    ]
  },
  "interfaces": {
    "compared": [
      "ui-ssr",
      "rest",
      "mcp"
    ],
    "result": "PASS",
    "notes": "UI (SSR) · REST · MCP equivalent (MCP uses calc API handler). ui-ssr is query-result HTML, not a live browser session."
  },
  "artifacts": {
    "evidence_bundle_sha256": "4d686430094e5aa707f5bb802beec06c26fcc547621fc695765b29d667cdfec9",
    "evidence_digest": "9cdd24be4a28947f8867d25a526d2cdbe5436460e9357e2a0ab12dcd7b6eaf82",
    "production_sha256": "36b20a13ec97ef1e6a76802f1f86b4d6a2b04374a7d11e4f0d3d10a2308804fa",
    "attested_catalog_sha256": "416608b7efe51524f7de1157d0db4f6847e390a8419dd0f8de74156eb915f129",
    "digest_registry": {
      "digest_algorithm": "sha256",
      "canonicalization": "json-sorted-keys-utf8",
      "entries": [
        {
          "name": "cvp_core_sha256",
          "field": "artifacts.cvp_core_sha256",
          "digest_scope": "cvp_verification_fingerprint_v2",
          "value": "9cdd24be4a28947f8867d25a526d2cdbe5436460e9357e2a0ab12dcd7b6eaf82",
          "note": "Immutable verification core; excludes attestation/live-status and Evidence contract counts"
        },
        {
          "name": "cvp_evidence_digest",
          "field": "artifacts.evidence_digest",
          "digest_scope": "cvp_verification_fingerprint_v2",
          "value": "9cdd24be4a28947f8867d25a526d2cdbe5436460e9357e2a0ab12dcd7b6eaf82",
          "note": "Alias of cvp_core_sha256 (historical field name)"
        },
        {
          "name": "artifact_evidence_sha256",
          "field": "release_integrity.digests.evidence_core_sha256",
          "digest_scope": "evidence_artifact_core",
          "value": "5e0d82de94740afe76cb816a3db397c4da9ce80f76c40c06c392c0c4142dc572",
          "note": "Published Evidence JSON core — Trust freshness / production bind subject"
        },
        {
          "name": "evidence_catalog_digest",
          "field": "artifacts.attested_catalog_sha256",
          "digest_scope": "capability_catalog",
          "value": "416608b7efe51524f7de1157d0db4f6847e390a8419dd0f8de74156eb915f129",
          "note": "Capability catalog integrity; site-wide, not per-suite fingerprint"
        }
      ]
    },
    "cvp_core_sha256": "9cdd24be4a28947f8867d25a526d2cdbe5436460e9357e2a0ab12dcd7b6eaf82"
  },
  "dependencies": [
    {
      "name": "cantilever-tip-triangle-partial-load-at-engine",
      "version": "1.0.0"
    },
    {
      "name": "cantilever-tip-triangle-partial-load-at-reference-oracle",
      "version": "1.0.0"
    },
    {
      "name": "node",
      "version": "20.19.2"
    }
  ],
  "attestation": {
    "status": "STALE",
    "href": "/.well-known/calculatorx-production-attestation.json",
    "id": "5f26825d06766888502f8c66b8e774f1d2c117d79d35add8eac32756335ab114",
    "attested_at": "2026-09-25T11:05:17.833Z",
    "last_confirmed_current_at": "2026-09-25T11:05:17.833Z",
    "site_attestation_current": false,
    "capability_attestation_current": false,
    "bound_snapshot_status": "pass",
    "live_report_status": "stale",
    "bound_attested_at": "2026-09-24T10:09:46.472Z",
    "live_updated_at": "2026-09-25T11:05:16.746Z",
    "bound_snapshot": {
      "status": "pass",
      "attested_at": "2026-09-24T10:09:46.472Z",
      "site_stale_count": 135
    },
    "live_site_status": {
      "href": "/.well-known/calculatorx-production-attestation.json"
    },
    "bound_snapshot_site_stale_count": 135,
    "site_stale_capability_count": 135,
    "stale_reason": "Capability production binding: STALE · Site report: STALE · Evidence changed after the last successful production attestation. Re-attestation required.",
    "evidence_attested_at": "2026-09-25T11:05:17.833Z"
  },
  "domain_review": {
    "status": "ABSENT",
    "spec_version": "1.0.0",
    "external_third_party": false,
    "note": "Named expert review not performed"
  },
  "timestamps": {
    "verified_at": "2026-09-25T11:05:17.833Z",
    "generated_at": "2026-09-25T11:05:17.833Z",
    "rendered_at": "2026-09-25T11:05:17.833Z",
    "notes": "verified_at/generated_at mark the first publication of this cvp_core_sha256 (artifacts.evidence_digest alias) for suite verification. evidence_attested_at/attested_at is the first production bind of that core digest. last_confirmed_current_at is the latest site-wide report that still confirms CURRENT. rendered_at is this JSON serialization and is not part of cvp_core_sha256 / evidence_digest. Production attestation binds cvp_core_sha256 (binds evidence_digest). Causal order: verified_at ≤ evidence_attested_at ≤ last_confirmed_current_at. attestation.bound_snapshot.site_stale_count is the site-wide stale capability count at Manifest bind time — not a live value. Fetch attestation.live_site_status.href for the current site report."
  },
  "links": {
    "legacy_evidence": "https://www.calculatorx.com/evidence/mechanical.statics.cantilever_tip_triangle_partial_load_at_deflection/1.0.0.json",
    "evidence_page": "https://www.calculatorx.com/evidence/mechanical.statics.cantilever_tip_triangle_partial_load_at_deflection/1.0.0",
    "calculator": "https://www.calculatorx.com/calc/physics/cantilever-tip-triangle-partial-load-at",
    "schema": "https://www.calculatorx.com/developers/cvp/schema/cvp-evidence-1.0.json",
    "protocol": "https://www.calculatorx.com/developers/cvp/spec/1.0",
    "manifest": "https://www.calculatorx.com/evidence/mechanical.statics.cantilever_tip_triangle_partial_load_at_deflection/1.0.0.cvp.json"
  }
}