hyperpolymath · hyperpolymath · Jun 26, 2026 · Jun 26, 2026 · Jun 26, 2026 · Jun 26, 2026
@@ -27,7 +27,7 @@ cargo test
 ## Key Design Decisions
 
 - Follows hyperpolymath ABI-FFI standard (Idris2 ABI, Zig FFI)
-- MPL-2.0 license
+- MPL-2.0 license (code) + CC-BY-SA-4.0 (docs); full texts in LICENSES/
 - RSR (Rhodium Standard Repository) template
 - Author: Jonathan D.A. Jewell <j.d.a.jewell@open.ac.uk>
 

@@ -4,7 +4,7 @@
 # Reads root-hygiene rules and auto-fixes what it can:
 #   - Delete banned files (AI.djot, duplicate CONTRIBUTING.adoc, stale snapshots)
 #   - Rename misnamed files (AI.a2ml → 0-AI-MANIFEST.a2ml)
-#   - Fix SPDX headers (AGPL → PMPL in dotfiles)
+#   - Fix SPDX headers (AGPL → MPL-2.0 in dotfiles)
 #   - Create missing required files (SECURITY.md, CONTRIBUTING.md)
 #   - Report unfixable issues as PR comments
 #
@@ -87,7 +87,7 @@ jobs:
           for dotfile in .gitignore .gitattributes .editorconfig; do
             if [ -f "$dotfile" ] && grep -q "AGPL-3.0" "$dotfile" 2>/dev/null; then
               sed -i 's/AGPL-3.0-or-later/MPL-2.0/g; s/AGPL-3.0/MPL-2.0/g' "$dotfile"
-              FIXES="$FIXES\n- Fixed SPDX header in \`$dotfile\` (AGPL → PMPL)"
+              FIXES="$FIXES\n- Fixed SPDX header in \`$dotfile\` (AGPL → MPL-2.0)"
               CHANGED=true
             fi
           done

@@ -15,7 +15,12 @@ Thumbs.db
 /target/
 /_build/
 /build/
+**/build/
 /dist/
+
+# Idris2 compiled artifacts
+*.ttc
+*.ttm
 /out/
 
 # Dependencies

@@ -52,3 +52,10 @@ License: MPL-2.0
 Files: cliff.toml
 Copyright: {{CURRENT_YEAR}} {{AUTHOR}} ({{OWNER}}) <{{AUTHOR_EMAIL}}>
 License: MPL-2.0
+
+# Documentation prose is CC-BY-SA-4.0 (code/config is MPL-2.0).
+# Last-match-wins in the Debian copyright format, so this overrides the
+# `Files: *` default above for prose docs.
+Files: *.adoc *.md docs/* docs/**/*
+Copyright: {{CURRENT_YEAR}} {{AUTHOR}} ({{OWNER}}) <{{AUTHOR_EMAIL}}>
+License: CC-BY-SA-4.0
@@ -34,7 +34,7 @@ is traceable.
 
 ### license-content
 - description: LICENSE contains expected identifier
-- run: grep -q 'PMPL\|MPL\|MIT\|Apache\|LGPL' LICENSE
+- run: grep -q 'MPL-2.0' LICENSE
 - severity: warning
 
 ## Container Security

@@ -5,7 +5,7 @@ version = "0.1.0"
 edition = "2024"
 authors = ["Jonathan D.A. Jewell <j.d.a.jewell@open.ac.uk>"]
 description = "Wrap concurrent code in Pony reference capabilities to eliminate data races at compile time"
-license-file = "LICENSE"
+license = "MPL-2.0"
 repository = "https://github.com/hyperpolymath/ponyiser"
 keywords = ["pony", "concurrency", "data-race-freedom", "safety"]
 categories = ["command-line-utilities", "development-tools"]

@@ -1,3 +1,5 @@
+SPDX-License-Identifier: MPL-2.0
+
 Mozilla Public License Version 2.0
 ==================================
 

@@ -106,7 +106,7 @@ Or via OPSM: `opsm update {{PACKAGE_NAME}}`
 
 == Security Notes
 
-* License: MPL-2.0 (Palimpsest License)
+* License: MPL-2.0 (code) / CC-BY-SA-4.0 (docs)
 * All dependencies SHA-pinned
 * `panic-attacker` scan results: link:INSTALL-SECURITY-REPORT.adoc[]
 * OpenSSF Scorecard: see badge in README

@@ -16,7 +16,7 @@ Maximal trust by default — LLM may read, build, test, lint, format.
 
 ### license-content
 - description: LICENSE contains expected SPDX identifier
-- run: grep -q 'SPDX\|License\|MIT\|Apache\|PMPL\|MPL' LICENSE
+- run: grep -q 'SPDX\|MPL-2.0' LICENSE
 - severity: critical
 
 ### no-secrets-committed

@@ -1,6 +1,6 @@
 = RSR Template Repository
 
-image:[Palimpsest-MPL-1.0,link="https://github.com/hyperpolymath/palimpsest-license"] image:[Palimpsest,link="https://github.com/hyperpolymath/palimpsest-license"]
+image:https://img.shields.io/badge/license-MPL--2.0-blue[MPL-2.0,link="LICENSES/MPL-2.0.txt"] image:https://img.shields.io/badge/docs-CC--BY--SA--4.0-blue[CC-BY-SA-4.0,link="LICENSES/CC-BY-SA-4.0.txt"]
 :toc:
 :sectnums:
 
@@ -78,7 +78,7 @@ just validate-rsr
 |Container build (Wolfi base, Podman)
 
 |`LICENSE`
-|MPL-2.0 (Palimpsest MPL)
+|MPL-2.0 (code) / CC-BY-SA-4.0 (docs)
 
 |`EXHIBIT-A-ETHICAL-USE.txt`
 |Ethical use guidelines (LICENSE Exhibit A)

@@ -87,7 +87,7 @@ CONTAINER ECOSYSTEM (Phase 2)
 
 REPO INFRASTRUCTURE
   .machine_readable/                ██████████ 100%    STATE/META/ECOSYSTEM active
-  Governance & License              ██████████ 100%    PMPL & Ethical use verified
+  Governance & License              ██████████ 100%    MPL-2.0 & Ethical use verified
   Development Shells (Nix/Guix)     ██████████ 100%    Reproducible env stable
 
 ─────────────────────────────────────────────────────────────────────────────

@@ -15,6 +15,8 @@ module Ponyiser.ABI.Layout
 import Ponyiser.ABI.Types
 import Data.Vect
 import Data.So
+import Data.Nat
+import Decidable.Equality
 
 %default total
 
@@ -28,24 +30,42 @@ paddingFor : (offset : Nat) -> (alignment : Nat) -> Nat
 paddingFor offset alignment =
   if offset `mod` alignment == 0
     then 0
-    else alignment - (offset `mod` alignment)
+    else minus alignment (offset `mod` alignment)
 
-||| Proof that alignment divides aligned size
+||| Proof that alignment divides aligned size: `m = k * n`.
 public export
 data Divides : Nat -> Nat -> Type where
   DivideBy : (k : Nat) -> {n : Nat} -> {m : Nat} -> (m = k * n) -> Divides n m
 
+||| Sound decision procedure for divisibility. Returns a genuine
+||| `Divides n m` witness when `n` evenly divides `m`, otherwise Nothing.
+||| Division by zero is undecidable here and yields Nothing.
+public export
+decDivides : (n : Nat) -> (m : Nat) -> Maybe (Divides n m)
+decDivides Z _ = Nothing
+decDivides (S k) m =
+  let q = m `div` (S k) in
+  case decEq m (q * (S k)) of
+    Yes prf => Just (DivideBy q prf)
+    No _ => Nothing
+
 ||| Round up to next alignment boundary
 public export
 alignUp : (size : Nat) -> (alignment : Nat) -> Nat
 alignUp size alignment =
   size + paddingFor size alignment
 
-||| Proof that alignUp produces aligned result
+||| Sound divisibility check for an aligned size. The general theorem
+||| "alignUp size align is always divisible by align" needs div/mod lemmas
+||| from Data.Nat; here we *decide* it via `decDivides`, which returns a
+||| genuine witness when it holds. For the concrete ABI layouts below,
+||| divisibility is proven outright (`DivideBy`). (Previously
+||| `alignUpCorrect … = DivideBy … Refl`, whose `Refl` cannot typecheck for
+||| symbolic inputs.)
 public export
-alignUpCorrect : (size : Nat) -> (align : Nat) -> (align > 0) -> Divides align (alignUp size align)
-alignUpCorrect size align prf =
-  DivideBy ((size + paddingFor size align) `div` align) Refl
+alignUpDivides : (size : Nat) -> (align : Nat) ->
+                 Maybe (Divides align (alignUp size align))
+alignUpDivides size align = decDivides align (alignUp size align)
 
 --------------------------------------------------------------------------------
 -- Struct Field Layout
@@ -69,15 +89,15 @@ nextFieldOffset f = alignUp (f.offset + f.size) f.alignment
 public export
 record StructLayout where
   constructor MkStructLayout
-  fields : Vect n Field
+  fields : Vect layoutFieldCount Field
   totalSize : Nat
   alignment : Nat
   {auto 0 sizeCorrect : So (totalSize >= sum (map (\f => f.size) fields))}
   {auto 0 aligned : Divides alignment totalSize}
 
 ||| Calculate total struct size with padding
 public export
-calcStructSize : Vect n Field -> Nat -> Nat
+calcStructSize : Vect k Field -> Nat -> Nat
 calcStructSize [] align = 0
 calcStructSize (f :: fs) align =
   let lastOffset = foldl (\acc, field => nextFieldOffset field) f.offset fs
@@ -86,23 +106,30 @@ calcStructSize (f :: fs) align =
 
 ||| Proof that field offsets are correctly aligned
 public export
-data FieldsAligned : Vect n Field -> Type where
+data FieldsAligned : Vect k Field -> Type where
   NoFields : FieldsAligned []
   ConsField :
     (f : Field) ->
-    (rest : Vect n Field) ->
+    (rest : Vect k Field) ->
     Divides f.alignment f.offset ->
     FieldsAligned rest ->
     FieldsAligned (f :: rest)
 
-||| Verify a struct layout is valid
+||| Verify a struct layout is valid. Builds a `StructLayout` only when both
+||| erased obligations are discharged by *real* witnesses: the size bound via
+||| `choose` and divisibility via `decDivides`. (Previously
+||| `MkStructLayout fields size align` left both `auto` proofs unsolved.)
 public export
-verifyLayout : (fields : Vect n Field) -> (align : Nat) -> Either String StructLayout
+verifyLayout : (fields : Vect k Field) -> (align : Nat) -> Either String StructLayout
 verifyLayout fields align =
-  let size = calcStructSize fields align
-   in case decSo (size >= sum (map (\f => f.size) fields)) of
-        Yes prf => Right (MkStructLayout fields size align)
-        No _ => Left "Invalid struct size"
+  let size = calcStructSize fields align in
+  case choose (size >= sum (map (\f => f.size) fields)) of
+    Right _ => Left "Invalid struct size"
+    Left okSize =>
+      case decDivides align size of
+        Nothing => Left "Total size not aligned"
+        Just dvd => Right (MkStructLayout fields size align
+                             {sizeCorrect = okSize} {aligned = dvd})
 
 --------------------------------------------------------------------------------
 -- Capability-Annotated Field Layout
@@ -147,6 +174,8 @@ mailboxMessageLayout =
     ]
     24  -- Total size: 24 bytes
     8   -- Alignment: 8 bytes
+    {sizeCorrect = Oh}
+    {aligned = DivideBy 3 Refl}
 
 ||| Pony actor header layout.
 |||
@@ -167,6 +196,8 @@ actorHeaderLayout =
     ]
     32  -- Total size: 32 bytes
     8   -- Alignment: 8 bytes
+    {sizeCorrect = Oh}
+    {aligned = DivideBy 4 Refl}
 
 ||| Actor state flags bitfield
 ||| Bit 0: running (actor is currently executing a behaviour)
@@ -188,16 +219,27 @@ data ActorFlag : Nat -> Type where
 |||
 ||| Each field carries a reference capability that constrains access.
 ||| The layout must respect C ABI alignment rules for FFI compatibility.
+|||
+||| Returns `Nothing` when the computed total size fails the size bound or is
+||| not 8-aligned. Both erased obligations are discharged by *real* witnesses
+||| (`choose` for the size bound, `decDivides` for alignment); the previous
+||| version returned a bare `StructLayout` with both `auto` proofs unsolved.
 public export
-actorFieldsLayout : (fields : Vect n CapField) -> (headerSize : Nat) -> StructLayout
+actorFieldsLayout : (fields : Vect k CapField) -> (headerSize : Nat) -> Maybe StructLayout
 actorFieldsLayout fields headerSize =
   let plainFields = map (\cf => MkField cf.fieldName
                                         (headerSize + cf.fieldOffset)
                                         cf.fieldSize
                                         cf.fieldAlign)
                         fields
-      totalSize = calcStructSize plainFields 8
-   in MkStructLayout plainFields totalSize 8
+      totalSize = calcStructSize plainFields 8 in
+  case choose (totalSize >= sum (map (\f => f.size) plainFields)) of
+    Right _ => Nothing
+    Left okSize =>
+      case decDivides 8 totalSize of
+        Nothing => Nothing
+        Just dvd => Just (MkStructLayout plainFields totalSize 8
+                            {sizeCorrect = okSize} {aligned = dvd})
 
 --------------------------------------------------------------------------------
 -- Platform-Specific Layouts
@@ -227,24 +269,59 @@ data CABICompliant : StructLayout -> Type where
     FieldsAligned layout.fields ->
     CABICompliant layout
 
-||| Check if layout follows C ABI
+||| Decide field alignment for every field, building a real `FieldsAligned`
+||| witness from per-field divisibility proofs.
+public export
+decFieldsAligned : (fs : Vect k Field) -> Maybe (FieldsAligned fs)
+decFieldsAligned [] = Just NoFields
+decFieldsAligned (f :: fs) =
+  case decDivides f.alignment f.offset of
+    Nothing => Nothing
+    Just dvd => case decFieldsAligned fs of
+                  Nothing => Nothing
+                  Just rest => Just (ConsField f fs dvd rest)
+
+||| Verify a layout against the C ABI alignment rules, returning a genuine
+||| `CABICompliant` proof (built from real per-field divisibility witnesses)
+||| or an error when some field offset is misaligned. (Previously
+||| `CABIOk layout ?fieldsAlignedProof` left a hole.)
 public export
 checkCABI : (layout : StructLayout) -> Either String (CABICompliant layout)
-checkCABI layout = Right (CABIOk layout ?fieldsAlignedProof)
+checkCABI layout =
+  case decFieldsAligned layout.fields of
+    Just prf => Right (CABIOk layout prf)
+    Nothing => Left "Field offsets are not correctly aligned for the C ABI"
 
 --------------------------------------------------------------------------------
 -- Mailbox Layout Proofs
 --------------------------------------------------------------------------------
 
-||| Proof that the mailbox message layout is C-ABI compliant
+||| Proof that the mailbox message layout is C-ABI compliant. Built directly
+||| from per-field `DivideBy` witnesses (offset = k * alignment): 0|8, 8|4,
+||| 12|4, 16|8. Multiplication reduces at type-check time, so these are fully
+||| verified by the compiler. (Previously a `?mailboxFieldsAligned` hole.)
 export
-mailboxMessageCABI : CABICompliant mailboxMessageLayout
-mailboxMessageCABI = CABIOk mailboxMessageLayout ?mailboxFieldsAligned
-
-||| Proof that the actor header layout is C-ABI compliant
+mailboxMessageCABI : CABICompliant Layout.mailboxMessageLayout
+mailboxMessageCABI =
+  CABIOk mailboxMessageLayout
+    (ConsField _ _ (DivideBy 0 Refl)
+    (ConsField _ _ (DivideBy 2 Refl)
+    (ConsField _ _ (DivideBy 3 Refl)
+    (ConsField _ _ (DivideBy 2 Refl)
+     NoFields))))
+
+||| Proof that the actor header layout is C-ABI compliant. Per-field offsets:
+||| 0|8, 8|8, 16|8, 24|4, 28|4. (Previously a `?actorHeaderFieldsAligned` hole.)
 export
-actorHeaderCABI : CABICompliant actorHeaderLayout
-actorHeaderCABI = CABIOk actorHeaderLayout ?actorHeaderFieldsAligned
+actorHeaderCABI : CABICompliant Layout.actorHeaderLayout
+actorHeaderCABI =
+  CABIOk actorHeaderLayout
+    (ConsField _ _ (DivideBy 0 Refl)
+    (ConsField _ _ (DivideBy 1 Refl)
+    (ConsField _ _ (DivideBy 2 Refl)
+    (ConsField _ _ (DivideBy 6 Refl)
+    (ConsField _ _ (DivideBy 7 Refl)
+     NoFields)))))
 
 --------------------------------------------------------------------------------
 -- Offset Calculation
@@ -258,7 +335,15 @@ fieldOffset layout name =
     Just idx => Just (finToNat idx ** index idx layout.fields)
     Nothing => Nothing
 
-||| Proof that field offset is within struct bounds
+||| Decide whether a field lies within a struct's byte bounds, returning a
+||| genuine proof when `offset + size <= totalSize`. The previous signature
+||| asserted this for *every* field unconditionally, which is false (a field
+||| need not belong to the layout); this honest version decides it via
+||| `choose` and the `?offsetInBoundsProof` hole is gone.
 public export
-offsetInBounds : (layout : StructLayout) -> (f : Field) -> So (f.offset + f.size <= layout.totalSize)
-offsetInBounds layout f = ?offsetInBoundsProof
+offsetInBounds : (layout : StructLayout) -> (f : Field) ->
+                 Maybe (So (f.offset + f.size <= layout.totalSize))
+offsetInBounds layout f =
+  case choose (f.offset + f.size <= layout.totalSize) of
+    Left ok => Just ok
+    Right _ => Nothing