qvm: recover entity hash search

docs/FINDINGS.md

@@ -1559,3 +1559,6 @@ RE-813–822 replaces the scoreboard decimal assumption with actual37914 executi
 
 
 **RE-853:** Rust matches 144 original temporary-event cases, including exact snap words, event-kind wrapping, metadata and preservation of allocator/caller fields. Five invalid source domains reject atomically in Rust. Allocation and native linking remain caller-owned; source class tokens require runtime metadata resolution. [Evidence](research/RUST_EVENT_CONSTRUCT.md).
+
+
+**RE-854:** 80 original 276433 cases recover nonzero active/class-pointer filtering, first match after cursor, scan limits and raw hash equality. Class text is never compared, so collisions return the first eligible hash match. Read-only world behavior is verified; unsafe pointers and native/runtime behavior remain open. [Evidence](research/QVM_ENTITY_HASH.md).

docs/PROVISIONAL_TODO.md

@@ -1581,3 +1581,6 @@ RE-853: Rust matches 144 original temporary-event cases, including exact snap wo
 
 
 - [ ] RE-854: Compose recovered camera/map/event policies into intermission flows; recover searches, angles, commands, allocation, respawn and publication; validate actual macOS/Linux runtime traces. [Scope](research/QVM_CAMERA_MAP_EVENT_BATCH.md).
+
+
+RE-854: 80 original 276433 cases recover nonzero active/class-pointer filtering, first match after cursor, scan limits and raw hash equality. Class text is never compared, so collisions return the first eligible hash match. Read-only world behavior is verified; unsafe pointers and native/runtime behavior remain open. Full runtime completion remains open. [Evidence](research/QVM_ENTITY_HASH.md).

docs/RESEARCH_LEDGER.md

@@ -1947,3 +1947,8 @@ Rust matches 144 original temporary-event cases, including exact snap words, eve
 RE-853 final review: targeted xtask registry regression passes for all five source-report parity edges, transition module selection and the shared intermission mode-classifier dependency. Added batch evidence, validation cadence and RE-854 integration/native follow-ups.
 
 Batch RE-844–853 boundary: the single `cargo xtask test-full --since 15d7fcac` run passed after commit ten: 1,668 Python tests, 147 Rust tests (assets 10, gameplay 109, xtask 28), 46 deterministic report producers, storage policy, 414 documentation files and whitespace checks. No generated report drift; validation notes amended into task ten. Original assets unchanged.
+
+
+## 2026-10-27 — RE-854 Original entity class-hash search and cursor semantics
+
+80 original 276433 cases recover nonzero active/class-pointer filtering, first match after cursor, scan limits and raw hash equality. Class text is never compared, so collisions return the first eligible hash match. Read-only world behavior is verified; unsafe pointers and native/runtime behavior remain open. Focused `cargo xtask test-group entity-hash` passes (5 Python tests); selected reports regenerate twice deterministically, with storage, documentation links and whitespace guards. Full suite deferred to task ten. Original assets unchanged; source fixtures do not establish complete native/runtime parity.

docs/REVERSE_ENGINEERING_TODO.md

@@ -1618,3 +1618,6 @@ Purpose: turn the supplied installation into an evidence-backed specification of
 
 
 - [ ] RE-854: Compose recovered camera/map/event policies into intermission flows; recover searches, angles, commands, allocation, respawn and publication; validate actual macOS/Linux runtime traces. [Scope](research/QVM_CAMERA_MAP_EVENT_BATCH.md).
+
+
+- [x] RE-854 Original entity class-hash search and cursor semantics ([evidence](research/QVM_ENTITY_HASH.md)).

docs/research/QVM_ENTITY_HASH.md

@@ -0,0 +1,7 @@
+# Original entity class-hash search and cursor semantics
+
+RE-854. Reproduce with `python3 scripts/analyze_qvm_entity_hash.py`; focused validation: `cargo xtask test-group entity-hash`. [Machine report](qvm-entity-hash.json).
+
+80 original 276433 cases recover nonzero active/class-pointer filtering, first match after cursor, scan limits and raw hash equality. Class text is never compared, so collisions return the first eligible hash match. Read-only world behavior is verified; unsafe pointers and native/runtime behavior remain open.
+
+Original executable/native runtime and complete Linux/macOS Rust/Bevy/Solari acceptance remain unverified.

docs/research/README.md

@@ -1155,3 +1155,6 @@ The extension collector adds five focused tests for native tail calls, command-r
 [RE-853: Rust temporary event construction and ownership boundaries](RUST_EVENT_CONSTRUCT.md).
 
 - [RE-844–853 camera, map and event batch evidence and next work](QVM_CAMERA_MAP_EVENT_BATCH.md).
+
+
+[RE-854: Original entity class-hash search and cursor semantics](QVM_ENTITY_HASH.md).

docs/research/qvm-entity-hash.json

@@ -0,0 +1,1203 @@
+{
+  "entities": [
+    {
+      "active": 0,
+      "hash": 7,
+      "name": 1
+    },
+    {
+      "active": 1,
+      "hash": 7,
+      "name": 0
+    },
+    {
+      "active": 2,
+      "hash": 4294967295,
+      "name": 1
+    },
+    {
+      "active": 1,
+      "hash": 7,
+      "name": 1
+    },
+    {
+      "active": -1,
+      "hash": 7,
+      "name": 2
+    },
+    {
+      "active": 1,
+      "hash": 8,
+      "name": 1
+    },
+    {
+      "active": 0,
+      "hash": 8,
+      "name": 1
+    },
+    {
+      "active": 1,
+      "hash": 0,
+      "name": 1
+    }
+  ],
+  "limits": "Actual276433 over80 cases. Nonzero active and class pointer plus equal raw hash select first entity after cursor. No class text comparison: collisions remain indistinguishable. Safe finite entity bounds only; native/runtime integration unverified.",
+  "probes": [
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+  ],
+  "sha256": "a589351dfe517470a1b121dd2164714987d9e4577bf00c6486e1540035d7a79d",
+  "source": {
+    "archive": "zUrT43_qvm.pk3",
+    "archive_sha256": "b59bf0c5bedf11d50e0edd220da7eade96de40601e98ae14c54c819047df0796",
+    "member": {
+      "bytes": 983300,
+      "comment_hex": "",
+      "compressed_bytes": 246560,
+      "compression": 8,
+      "crc32": "98ea1768",
+      "create_system": 0,
+      "create_version": 63,
+      "date_time": [
+        2018,
+        6,
+        18,
+        22,
+        11,
+        50
+      ],
+      "directory": false,
+      "entry_index": 2,
+      "external_attr": 32,
+      "extra_hex": "0a0020000000000001001800d1e24e974007d40116dcbf962f1fd20116dcbf962f1fd201",
+      "extract_version": 20,
+      "flags": 0,
+      "header_offset": 221309,
+      "internal_attr": 0,
+      "occurrence": 0,
+      "output": "assets/extracted/zUrT43_qvm.pk3/members/000002/vm/qagame.qvm",
+      "path": "vm/qagame.qvm",
+      "sha256": "a589351dfe517470a1b121dd2164714987d9e4577bf00c6486e1540035d7a79d",
+      "type": "member",
+      "volume": 0
+    }
+  }
+}

docs/research/qvm-resumer-audit.json

@@ -8587,6 +8587,17 @@
       "repeated_calls_opt_in": false,
       "repeated_calls_setting": "default_false"
     },
+    {
+      "backward_conditional_branches": [],
+      "calls": [],
+      "explicit_result_offsets": null,
+      "helper": "qvm_trace_support.resume",
+      "line": 11,
+      "literal_range": null,
+      "path": "scripts/qvm_camera_world_support.py",
+      "repeated_calls_opt_in": true,
+      "repeated_calls_setting": "literal_true"
+    },
     {
       "backward_conditional_branches": [],
       "calls": [
@@ -10025,10 +10036,10 @@
     }
   },
   "summary": {
-    "call_expressions": 202,
-    "files": 154,
+    "call_expressions": 203,
+    "files": 155,
     "legacy_expressions": 158,
-    "nonliteral_ranges": 27,
+    "nonliteral_ranges": 28,
     "unresolved_mode_expressions": 3
   }
 }

scripts/analyze_qvm_entity_hash.py

@@ -0,0 +1,15 @@
+#!/usr/bin/env python3
+import itertools
+from pathlib import Path
+from qvm_research_support import source
+from qvm_camera_world_support import find_class,POOL
+from analyze_qvm import write_json
+ENTITIES=[{'active':0,'name':1,'hash':7},{'active':1,'name':0,'hash':7},{'active':2,'name':1,'hash':0xffffffff},{'active':1,'name':1,'hash':7},{'active':-1,'name':2,'hash':7},{'active':1,'name':1,'hash':8},{'active':0,'name':1,'hash':8},{'active':1,'name':1,'hash':0}]
+def main():
+ q,raw,h,ins=source();rows=[]
+ for count,after,hash in itertools.product([0,1,4,8],[-1,0,2,3,7],[0,7,8,0xffffffff]):
+  m={34992508:count}
+  for j,e in enumerate(ENTITIES):m.update({POOL+880*j+532:e['active'],POOL+880*j+536:e['name'],POOL+880*j+540:e['hash']})
+  m,value,p,b=find_class(ins,m,{8:0 if after<0 else POOL+880*after,12:hash});rows.append({'input':dict(count=count,after=after,hash=hash),'result':-1 if value==0 else (value-POOL)//880,**p})
+ write_json(Path('docs/research/qvm-entity-hash.json'),{'source':q['source'],'sha256':q['sha256'],'entities':ENTITIES,'probes':rows,'limits':'Actual276433 over80 cases. Nonzero active and class pointer plus equal raw hash select first entity after cursor. No class text comparison: collisions remain indistinguishable. Safe finite entity bounds only; native/runtime integration unverified.'})
+if __name__=='__main__':main()

scripts/qvm_camera_world_support.py

@@ -0,0 +1,16 @@
+"""Coherent finite camera/world helpers, with corrected nested child reentry."""
+from qvm_exit_rules_support import E,POOL
+from qvm_trace_support import resume
+from qvm_string_memory_support import frame_args
+from qvm_byte_memory_support import write_bytes
+B=E+0x60000
+S=B+0x30000
+
+def run(ins,m,start,stop,frame,args=None,b=None,handlers=None,base=B):
+    m,b=frame_args(m,b or {},{base+frame+o:v for o,v in (args or {}).items()})
+    before=dict(m);m,e=resume(ins,start+1,stop,m,base,handlers=handlers or {},byte_inputs=b,repeated_calls=True,sync_child_words=True,coherent_memory=True,byte_handlers=True,capture_byte_memory=True,segment_limit=4096,limit=32768)
+    changes=[{'address':a,'before':v&0xffffffff,'after':m[a]&0xffffffff} for a,v in before.items() if (m[a]&0xffffffff)!=(v&0xffffffff) and not B<=a<B+0x20000]
+    return m,e['return'],{'execution':{k:e[k] for k in ['stop','trace_length','trace_sha256']},'changes':changes},e['byte_memory']
+def string(m,b,address,data):write_bytes(m,b,{address+j:v for j,v in enumerate(bytes(data)+b'\0')})
+
+def find_class(ins,m,args,b=None,base=B):return run(ins,m,276433,276503,12,args,b,base=base)

scripts/test_qvm_entity_hash.py

@@ -0,0 +1,12 @@
+import json,unittest
+from pathlib import Path
+class HashTests(unittest.TestCase):
+ def test_independent_first_match_and_cursor(self):
+  r=json.loads(Path('docs/research/qvm-entity-hash.json').read_text());self.assertEqual(len(r['probes']),80)
+  for p in r['probes']:
+   a=p['input'];ids=[j for j,e in enumerate(r['entities'][:a['count']]) if j>a['after'] and e['active']!=0 and e['name']!=0 and e['hash']==a['hash']];self.assertEqual(p['result'],ids[0] if ids else -1)
+ def test_read_only_and_hash_collision_order(self):
+  r=json.loads(Path('docs/research/qvm-entity-hash.json').read_text())
+  for p in r['probes']:self.assertEqual(p['changes'],[])
+  rows={tuple(p['input'][k] for k in ['count','after','hash']):p['result'] for p in r['probes']};self.assertEqual(rows[(8,2,7)],3);self.assertEqual(rows[(8,3,7)],4)
+if __name__=='__main__':unittest.main()

xtask/checks.tsv

@@ -2333,3 +2333,8 @@ report	scripts/analyze_rust_event_construct.py	docs/research/rust-event-construc
 edge	docs/research/rust-event-construct.json	scripts/test_rust_event_construct.py
 group	rust-event-construct	scripts/analyze_rust_event_construct.py
 edge	scripts/analyze_rust_event_construct.py	scripts/analyze_qvm_resumer_audit.py
+report	scripts/analyze_qvm_entity_hash.py	docs/research/qvm-entity-hash.json
+edge	docs/research/qvm-entity-hash.json	scripts/test_qvm_entity_hash.py
+group	entity-hash	scripts/analyze_qvm_entity_hash.py
+edge	scripts/analyze_qvm_entity_hash.py	scripts/analyze_qvm_resumer_audit.py
+edge	scripts/qvm_camera_world_support.py	scripts/analyze_qvm_resumer_audit.py