qvm: complete child transform

docs/ASSET_PIPELINE_TODO.md

@@ -688,3 +688,6 @@ Research progress: RE-670 [report](research/QVM_POSED_MODEL.md); remaining nativ
 
 
 Research progress: RE-671 [report](research/QVM_CHILD_ORIGIN.md); remaining native/content/runtime/platform scope stays open.
+
+
+Research progress: RE-672 [report](research/QVM_CHILD_TRANSFORM.md); remaining native/content/runtime/platform scope stays open.

docs/FINDINGS.md

@@ -1034,3 +1034,6 @@ Bounded qagame paths recover bomb-plant/inactivity correction requests, direct f
 
 
 **RE-671 — Child sample origin through parent-chain rotations:** 22009 copies sample64..72 into child origin, rotates through every parent basis, then adds only the immediate parent origin; null parent exits before basis composition. [Evidence](research/QVM_CHILD_ORIGIN.md).
+
+
+**RE-672 — Complete child transform with exact fourth-row arithmetic:** Complete22009 composes the sample basis only with nonnull parents and uses local40/60/48/68 for its fourth product row, preserving unusual source arithmetic. [Evidence](research/QVM_CHILD_TRANSFORM.md).

docs/PROVISIONAL_TODO.md

@@ -1014,3 +1014,6 @@ Research progress: RE-670 [report](research/QVM_POSED_MODEL.md); remaining nativ
 
 
 Research progress: RE-671 [report](research/QVM_CHILD_ORIGIN.md); remaining native/content/runtime/platform scope stays open.
+
+
+Research progress: RE-672 [report](research/QVM_CHILD_TRANSFORM.md); remaining native/content/runtime/platform scope stays open.

docs/RESEARCH_LEDGER.md

@@ -1012,3 +1012,8 @@ Grenade construction now runs actual276433 over an explicit pool and inherits th
 ## 2026-10-21 — RE-671 Child sample origin through parent-chain rotations (separate task commit)
 
 22009 copies sample64..72 into child origin, rotates through every parent basis, then adds only the immediate parent origin; null parent exits before basis composition. 16 fixtures independently check ordered parent rotations, immediate translation, zero-parent exit and bounded cycle rejection. Full suite: 1145 tests pass. Report regenerates byte-identically (21978 bytes). Storage/filter, links and whitespace checks pass. No assets/Rust runtime/shared VM evaluator changed; native/reference/legal/full platform scope remains open.
+
+
+## 2026-10-21 — RE-672 Complete child transform with exact fourth-row arithmetic (separate task commit)
+
+Complete22009 composes the sample basis only with nonnull parents and uses local40/60/48/68 for its fourth product row, preserving unusual source arithmetic. 16 full-record fixtures independently verify all matrix products, parent origin composition, exact child/sample alias reads and unrelated metadata preservation. Full suite: 1149 tests pass. Report regenerates byte-identically (52574 bytes). Storage/filter, links and whitespace checks pass. No assets/Rust runtime/shared VM evaluator changed; native/reference/legal/full platform scope remains open.

docs/REVERSE_ENGINEERING_TODO.md

@@ -1057,3 +1057,6 @@ Purpose: turn the supplied installation into an evidence-backed specification of
 
 
 - [x] RE-671 Child sample origin through parent-chain rotations ([report](research/QVM_CHILD_ORIGIN.md)).
+
+
+- [x] RE-672 Complete child transform with exact fourth-row arithmetic ([report](research/QVM_CHILD_TRANSFORM.md)).

docs/research/QVM_CHILD_TRANSFORM.md

@@ -0,0 +1,7 @@
+# Complete child transform with exact fourth-row arithmetic
+
+RE-672. Reproduce with `python3 scripts/analyze_qvm_child_transform.py`; check with `python3 scripts/test_qvm_child_transform.py`. The [machine report](qvm-child-transform.json) retains source identity and bounded fixtures.
+
+Complete22010–23089 copies the sample origin, applies recovered parent-origin behavior and writes sixteen child basis words when a parent exists. Its fourth multiplication row is built from sample100,0,sample108,1 because source reads local40/60/48/68; replacing it with conventional0,0,0,1 changes output. Independent scalar float32 dot-product oracles check every record word. Exact sample/child alias fixtures confirm all basis inputs are read before origin overwrite. Null parent preserves the old child basis and exits after origin copy. All data are explicit acyclic fixture records; no native or geometry child executes.
+
+No original executable/full QVM/native collision/physics/rendering executes. Native responses and legal input domains are supplied or unverified where stated; full runtime/macOS/Linux Rust/Bevy/Solari gameplay remains open.

docs/research/README.md

@@ -615,3 +615,6 @@ The extension collector adds five focused tests for native tail calls, command-r
 
 
 [RE-671: Child sample origin through parent-chain rotations](QVM_CHILD_ORIGIN.md). Reproduce with `python3 scripts/analyze_qvm_child_origin.py`; check with `python3 scripts/test_qvm_child_origin.py`.
+
+
+[RE-672: Complete child transform with exact fourth-row arithmetic](QVM_CHILD_TRANSFORM.md). Reproduce with `python3 scripts/analyze_qvm_child_transform.py`; check with `python3 scripts/test_qvm_child_transform.py`.

docs/research/qvm-child-transform.json

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scripts/analyze_qvm_child_transform.py

@@ -0,0 +1,21 @@
+#!/usr/bin/env python3
+"""Complete22009, including original fourth-row source arithmetic."""
+import itertools
+from pathlib import Path
+from qvm_research_support import source,execute
+from analyze_qvm_child_origin import fixture,origin,LOCAL,CHILD,SAMPLE
+from analyze_qvm import write_json
+
+def transform(ins,m):
+    m=dict(m);_,o=origin(ins,m);sample=m[LOCAL+232];before=[m[CHILD+j]&0xffffffff for j in range(0,112,4)];samples=[m[sample+j]&0xffffffff for j in range(64,112,4)]
+    m,_,e=execute(ins,22010,23090,m,(0,0,0),LOCAL)
+    return m,{'initial_record':before,'sample_words64_108':samples,'origin_contract':o,'sample_aliases_child':sample==CHILD,'final_record':[m[CHILD+j]&0xffffffff for j in range(0,112,4)],'execution':e}
+
+def main():
+    q,raw,h,ins=source();rows=[]
+    for depth,kind,alias in itertools.product([0,1,2,3],['identity','turn-scale'],[False,True]):
+        m=fixture(depth,kind)
+        if alias:m[LOCAL+232]=CHILD
+        rows.append(transform(ins,m)[1])
+    write_json(Path('docs/research/qvm-child-transform.json'),{'source':q['source'],'sha256':q['sha256'],'probes':rows,'limits':'Complete22010–23089 on acyclic fixture parents, no child/native calls. Fourth row reads local40/60/48/68 exactly, not a conventional homogeneous row. Alias probes describe bounded memory arithmetic, not legal model input.'})
+if __name__=='__main__':main()

scripts/test_qvm_child_transform.py

@@ -0,0 +1,33 @@
+import json,unittest
+from pathlib import Path
+from test_qvm_ground import word,n,f
+from test_qvm_child_origin import expected as origin
+
+def expected(p):
+    out=p['initial_record'][:];contract=dict(p['origin_contract']);contract['sample_origin']=p['sample_words64_108'][:3];out[19:22]=origin(contract)
+    if not contract['parents']:return out
+    a=list(map(n,p['sample_words64_108']));matrix=[a[3:6]+[0],a[6:9]+[0],a[9:12]+[0],[a[9],0,a[11],1]];b=[[n(x) for x in p['initial_record'][3+4*j:7+4*j]] for j in range(4)]
+    for r in range(4):
+        for c in range(4):
+            v=f(matrix[r][0]*b[0][c])
+            for k in range(1,4):v=f(v+f(matrix[r][k]*b[k][c]))
+            out[3+4*r+c]=word(v)
+    return out
+class ChildTransformTests(unittest.TestCase):
+    @classmethod
+    def setUpClass(cls):cls.rows=json.loads(Path('docs/research/qvm-child-transform.json').read_text())['probes']
+    def test_independent_entire_record_and_nonstandard_fourth_row(self):
+        self.assertEqual(len(self.rows),16)
+        for p in self.rows:self.assertEqual(p['final_record'],expected(p))
+    def test_alias_reads_precede_origin_overwrite(self):
+        self.assertEqual(sum(p['sample_aliases_child'] for p in self.rows),8)
+        for p in self.rows:
+            if p['sample_aliases_child']:self.assertEqual(p['sample_words64_108'],p['initial_record'][16:28])
+    def test_null_parent_preserves_basis(self):
+        for p in self.rows:
+            if not p['origin_contract']['parents']:self.assertEqual(p['initial_record'][3:19],p['final_record'][3:19])
+    def test_no_child_calls_and_unrelated_words_preserved(self):
+        for p in self.rows:
+            self.assertEqual(p['execution']['calls'],[])
+            for j in list(range(3))+list(range(22,28)):self.assertEqual(p['initial_record'][j],p['final_record'][j])
+if __name__=='__main__':unittest.main()