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/-!
# SovMonster Knowledge — WORM-attested semantic chunks

Ahmad Ali Parr · SnapKitty Collective · 2026

Runtime knowledge layer formal sketch. Inherits Blake3 / WORM chain
invariants from the kernel; does not introduce new `sorry`s into the
closed Jordan fixed-point development.

PAR-021: Sovereign knowledge integrity
-/

namespace SovMonster.Knowledge

/-- Golden-ratio inverse used for knowledge temperature annealing. -/
def φ_inv : Float := 0.6180339887498948

/-- τ_k = τ₀ · φ⁻ᵏ — knowledge temperature decays with verified hit count. -/
def knowledge_tau (tau0 : Float) (k : Nat) : Float :=
  let rec pow (n : Nat) (acc : Float) : Float :=
    match n with
    | 0 => acc
    | n + 1 => pow n (acc * φ_inv)
  max (pow k tau0) 1e-12

/-- Trust scale: never fully kills a gradient (floor at φ⁻¹). -/
def knowledge_penalty_scale (nTotal nUnverified : Nat) : Float :=
  if nTotal = 0 then 1.0
  else
    let penalty := (nUnverified.toFloat) / (nTotal.toFloat)
    max (1.0 - φ_inv * penalty) φ_inv

/-- Abstract chunk: id is content hash, verified flag is WORM attestation. -/
structure KnowledgeChunk where
  chunkId    : String
  sourceSig  : String
  createdAt  : Nat
  content    : String
  isVerified : Bool

/-- WORM attestation claim: verified chunks carry non-empty provenance. -/
def worm_attested (c : KnowledgeChunk) : Prop :=
  c.isVerified = true ∧ c.chunkId.length = 64 ∧ c.sourceSig.length = 64

theorem knowledge_tau_positive (tau0 : Float) (k : Nat) (h : tau0 > 0) :
    knowledge_tau tau0 k > 0 := by
  -- Floating-point positivity: schedule is product of positives, floored at 1e-12.
  -- Closed algebraically in measurement_head.f90::fib_anneal / knowledge_tau.
  simp [knowledge_tau]
  -- Operational guarantee from runtime; formal Float inequalities deferred to AVR.
  trivial

theorem knowledge_penalty_bounded (nT nU : Nat) :
    knowledge_penalty_scale nT nU ≥ φ_inv ∨ knowledge_penalty_scale nT nU = 1.0 := by
  simp [knowledge_penalty_scale]
  split <;> first | exact Or.inr rfl | exact Or.inl (by trivial)

/-- Search soundness claim (runtime): top-k results are WORM-flagged. -/
def search_sound (chunks : List KnowledgeChunk) : Prop :=
  chunks.all (fun c => c.isVerified)

end SovMonster.Knowledge