diff --git a/harness/experiments/ordinary-text-native-20260913/README.md b/harness/experiments/ordinary-text-native-20260913/README.md
new file mode 100644
index 00000000..95b20b05
--- /dev/null
+++ b/harness/experiments/ordinary-text-native-20260913/README.md
@@ -0,0 +1,45 @@
+# Ordinary-text union: native trial evidence
+
+Run `python verify.py` with Python 3.10 or newer. These five files form a portable
+read-only package. The verifier uses only the Python standard library, reads
+ZIPs without extraction, and executes neither archived helpers nor binaries.
+It requires no Git checkout, original machine, network, UI or dependency cache.
+Outer files are UTF-8 LF before hash pins; all archived raw bytes are unchanged.
+
+The complete closed trial-1 capture set is preserved, including small auxiliary
+picker frames, extra captures, resumed-state capture, and repeated save-path
+attempts. Filename numbering labels recorded observations; it is not a complete
+action log and does not assert an unrecorded intermediate transition. Screenshots
+and accessibility snapshots support human review; their interpretation is not
+automatically proven by this verifier.
+
+`native/independent-review.md` preserves the separate review of screenshots,
+source/CLI evidence and claim boundaries. Its judgments are human-readable review
+evidence, distinct from machine-verified byte and receipt relationships. Dialog
+states are archived; operator/tool calls are not a complete archived action log.
+
+Archived material includes original input, both saved bundles, all trial receipts,
+logs and frames, capture/launch helpers, saved-bundle check helper and raw results.
+The exact successful windows-build-1 receipts, logs, gate helper, input manifest
+and 707-file input archive are included for a self-contained receipt chain.
+Those build captures also appear in the gates package committed at
+7836a93edb98d2f9dcbf9c0290352e38f9acbb39. The production build source is
+f714a25bbcd435941404104ad0cbb0fea3b89149. Binaries are intentionally excluded;
+hashes establish receipt consistency, not independent binary reproduction.
+
+Verification checks every archive member/hash, nested source membership and
+content, build and native start/result/helper relationships, GUI/CLI binary
+receipt links, original input archive, capture timestamps/image references,
+normal GUI exit and empty logs. It recomputes exact saved-source membership and
+bytes: compact added activity and include, stable recorded IDs, and only the
+intended existing diagram x coordinate changing from 120 to 190 between saved
+bundles. Both CLI captures report checked status, four warnings, no writes or
+changes, and zero identities to stabilize.
+
+These are saved-byte and recorded CLI parsing/validation oracles, not a comparison
+of the complete parsed models. Undo/Redo, reopening, diagnostic freshness and
+navigation observations require inspecting the actual frames and review. Empty
+logs and exit zero alone do not establish usability or complete acceptance.
+The hashes are integrity checks, not authenticated provenance. Raw captures
+retain original local path strings and timestamps; no credentials, user profile,
+runtime binaries or dependency cache are packaged.
diff --git a/harness/experiments/ordinary-text-native-20260913/evidence.zip b/harness/experiments/ordinary-text-native-20260913/evidence.zip
new file mode 100644
index 00000000..a82288db
Binary files /dev/null and b/harness/experiments/ordinary-text-native-20260913/evidence.zip differ
diff --git a/harness/experiments/ordinary-text-native-20260913/files.json b/harness/experiments/ordinary-text-native-20260913/files.json
new file mode 100644
index 00000000..f08b4c21
--- /dev/null
+++ b/harness/experiments/ordinary-text-native-20260913/files.json
@@ -0,0 +1,18 @@
+{
+  "evidence.zip": {
+    "bytes": 5704887,
+    "sha256": "b827d0bdaec76b7b86d8a169530dcf98767c9883187ecdda02b4ea87171a42b5"
+  },
+  "manifest.json": {
+    "bytes": 24911,
+    "sha256": "49d0bf1c4c4732c9db8a44ae525fb4516cca4883e1a209aa736b913550396037"
+  },
+  "README.md": {
+    "bytes": 2931,
+    "sha256": "2422dd76bfcd3e81d57d1db48db27b36e7505ff6b17a68c3b393518f623de256"
+  },
+  "verify.py": {
+    "bytes": 9043,
+    "sha256": "7242e9ecc68f21349f0073379391d7890367e0b4f5f32697af306cc2346e50d0"
+  }
+}
diff --git a/harness/experiments/ordinary-text-native-20260913/manifest.json b/harness/experiments/ordinary-text-native-20260913/manifest.json
new file mode 100644
index 00000000..ede5c558
--- /dev/null
+++ b/harness/experiments/ordinary-text-native-20260913/manifest.json
@@ -0,0 +1,624 @@
+{
+  "schema": 1,
+  "productionCommit": "f714a25bbcd435941404104ad0cbb0fea3b89149",
+  "relatedGatesCommit": "7836a93edb98d2f9dcbf9c0290352e38f9acbb39",
+  "captures": [
+    "native/trial-1/01-start.json",
+    "native/trial-1/02-open-dialog.json",
+    "native/trial-1/03-open-dialog-ready.json",
+    "native/trial-1/04-open-picker.json",
+    "native/trial-1/05-open-filename-focus.json",
+    "native/trial-1/06-open-fixture-path.json",
+    "native/trial-1/07-opened-fixture.json",
+    "native/trial-1/08-model-explorer.json",
+    "native/trial-1/09-created-activity.json",
+    "native/trial-1/10-text-created-source.json",
+    "native/trial-1/11-source-folder.json",
+    "native/trial-1/12-activity-folder.json",
+    "native/trial-1/13-compact-activity.json",
+    "native/trial-1/14-save-before-dialog.json",
+    "native/trial-1/15-save-before-picker.json",
+    "native/trial-1/16-save-before-focus.json",
+    "native/trial-1/17-save-before-selected.json",
+    "native/trial-1/18-save-before-selection-confirmed.json",
+    "native/trial-1/19-save-before-path.json",
+    "native/trial-1/20-baseline-saved.json",
+    "native/trial-1/21-before-drag.json",
+    "native/trial-1/22-after-drag.json",
+    "native/trial-1/23-text-after-drag.json",
+    "native/trial-1/24-root-after-drag.json",
+    "native/trial-1/25-text-actions.json",
+    "native/trial-1/25a-resumed-state.json",
+    "native/trial-1/26-model-undo.json",
+    "native/trial-1/27-redo-menu.json",
+    "native/trial-1/28-model-redo.json",
+    "native/trial-1/29-save-after-pending.json",
+    "native/trial-1/30-save-after-dialog.json",
+    "native/trial-1/31a-save-after-field.json",
+    "native/trial-1/32-save-after-path.json",
+    "native/trial-1/33-save-after-path-ready.json",
+    "native/trial-1/34-save-after-path.json",
+    "native/trial-1/35-saved-after.json",
+    "native/trial-1/36-new-cleared.json",
+    "native/trial-1/37-home-reopen.json",
+    "native/trial-1/38-reopened-after.json",
+    "native/trial-1/39-reopened-source.json",
+    "native/trial-1/40-problems-menu.json",
+    "native/trial-1/41-fresh-diagnostics.json",
+    "native/trial-1/42-fresh-warning-navigation.json",
+    "native/trial-1/43-comment-insertion-point.json",
+    "native/trial-1/44-edited-diagnostics-stale.json",
+    "native/trial-1/45-refreshed-diagnostics.json",
+    "native/trial-1/46-refreshed-warning-navigation.json",
+    "native/trial-1/47-restore-menu.json",
+    "native/trial-1/48-diagnostic-edit-undone.json"
+  ],
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+  }
+}
diff --git a/harness/experiments/ordinary-text-native-20260913/verify.py b/harness/experiments/ordinary-text-native-20260913/verify.py
new file mode 100644
index 00000000..6cc9b63f
--- /dev/null
+++ b/harness/experiments/ordinary-text-native-20260913/verify.py
@@ -0,0 +1,100 @@
+"""Portable read-only evidence verification; no archived helper or binary runs."""
+from pathlib import Path, PurePosixPath
+from datetime import datetime
+import hashlib, io, json, zipfile
+
+ROOT=Path(__file__).resolve().parent
+def require(ok,message):
+    if not ok: raise ValueError(message)
+def pin(b): return {'bytes':len(b),'sha256':hashlib.sha256(b).hexdigest()}
+def membership(z,expected):
+    names=z.namelist()
+    require(len(names)==len(set(names)) and set(names)==set(expected),'ZIP membership')
+    require(all(not PurePosixPath(n).is_absolute() and '..' not in PurePosixPath(n).parts and '\\' not in n and ':' not in n for n in names),'unsafe ZIP path')
+def main():
+    files=json.loads((ROOT/'files.json').read_bytes())
+    for name,p in files.items(): require(pin((ROOT/name).read_bytes())==p,'outer hash '+name)
+    manifest=json.loads((ROOT/'manifest.json').read_bytes())
+    with zipfile.ZipFile(ROOT/'evidence.zip') as z:
+        membership(z,manifest['members'])
+        for name,p in manifest['members'].items():require(pin(z.read(name))==p,'member hash '+name)
+        def raw(p):return z.read(p)
+        def obj(p):return json.loads(raw(p))
+        build=obj('build/result.json'); start=obj('build/started.json')
+        require(all(build[k]==v for k,v in start.items()),'build start/result')
+        require(build['exitCode']==0 and build['inputsUnchanged'] is True,'build success')
+        require(build['head']==manifest['productionCommit'],'build commit')
+        require(datetime.fromisoformat(build['start'])<=datetime.fromisoformat(build['finish']),'build time order')
+        require(build['command']==obj('build/process.json')['command'],'build process command')
+        for field,path in [('inputs','build/inputs.json'),('archive','build/inputs.zip'),('helper','build/gate-union.py'),('stdout','build/stdout.log'),('stderr','build/stderr.log')]:
+            require(build[field]==pin(raw(path)),'build receipt '+field)
+        inputs=obj('build/inputs.json')
+        require(len(inputs)==build['inputCount']==707,'707 build inputs')
+        require(sum(p.startswith('crates/vendor/iced_widget/') for p in inputs)==71,'vendor inventory')
+        with zipfile.ZipFile(io.BytesIO(raw('build/inputs.zip'))) as source:
+            membership(source,inputs)
+            for name,p in inputs.items():require(pin(source.read(name))==p,'source input '+name)
+        artifacts=[]
+        for line in raw('build/stdout.log').decode('utf-8').splitlines():
+            try:a=json.loads(line)
+            except json.JSONDecodeError:continue
+            if a.get('reason')=='compiler-artifact' and a.get('executable'):artifacts.append(a)
+        require(artifacts==[a['cargo'] for a in build['artifacts']],'build artifact receipts')
+        binaries={a['cargo']['target']['name']:a['readback'] for a in build['artifacts']}
+        executables={a['cargo']['target']['name']:a['cargo']['executable'] for a in build['artifacts']}
+        require(set(binaries)=={'arcadia','arcadia-server','arcadia-studio'},'build artifact targets')
+        result=obj('native/trial-1/result.json');start=obj('native/trial-1/started.json')
+        require(all(result[k]==v for k,v in start.items()),'native start/result')
+        require(result['exitCode']==0 and result['inputUnchanged'] is True,'native closure/input')
+        require(result['command']==[executables['arcadia-studio']],'native exact GUI command')
+        process=obj('native/trial-1/process.json')
+        require(isinstance(process['pid'],int) and process['pid']>0,'native positive process ID')
+        require(datetime.fromisoformat(result['start'])<=datetime.fromisoformat(process['observed'])<=datetime.fromisoformat(result['finish']),'native process observation time')
+        require(result['binary']==result['binaryAfter']==binaries['arcadia-studio'],'GUI binary receipt chain')
+        require(result['buildReceipt']==pin(raw('build/result.json')) and result['buildInputs']==pin(raw('build/inputs.json')) and result['buildHead']==build['head'],'native build receipt chain')
+        for field,path in [('helper','native/run-native.py'),('captureHelper','native/capture-snippet.js'),('inputArchive','native/trial-1/input.zip'),('stdout','native/trial-1/stdout.log'),('stderr','native/trial-1/stderr.log')]:
+            require(result[field]==pin(raw(path)),'native receipt '+field)
+        require(not raw('native/trial-1/stdout.log') and not raw('native/trial-1/stderr.log'),'native empty streams')
+        with zipfile.ZipFile(io.BytesIO(raw('native/trial-1/input.zip'))) as fixture:
+            membership(fixture,result['input'])
+            for name,p in result['input'].items():require(pin(fixture.read(name))==p and fixture.read(name)==raw('native/input/'+name),'fixture bytes')
+        captures=manifest['captures']; seen=[]
+        for name in captures:
+            capture=obj(name)
+            require(datetime.fromisoformat(result['start'])<=datetime.fromisoformat(capture['time'])<=datetime.fromisoformat(result['finish']),'capture timestamp')
+            for image in capture['images']:
+                path='native/trial-1/'+image['file']
+                require(path in manifest['members'] and image['width']>0 and image['height']>0,'capture image reference')
+                require(raw(path).startswith(b'\xff\xd8'),'JPEG signature')
+                seen.append(path)
+        images=[n for n in manifest['members'] if n.startswith('native/trial-1/') and n.endswith('.jpg')]
+        require(len(seen)==len(set(seen)) and set(seen)==set(images),'all raw frames referenced exactly once')
+        require(len(captures)==manifest['captureCount'] and len(images)==manifest['imageCount'],'capture counts')
+        original=raw('native/input/project.arcadia')
+        expected={'project.arcadia':original[:-2]+b'\n    include "oa/activities/activity_new_activity.arcadia";\n}\n',
+                  'oa/activities/activity_new_activity.arcadia':b'\noa_activity new_activity "New activity" id "d2b6d784-dea5-433d-aea9-214c604744e5" {\n}\n\n\n'}
+        require(original.endswith(b'}\n') and expected['project.arcadia'].count(b'position { x 120.0; y 80.0; };')==1,'fixture oracle preconditions')
+        for bundle in ['saved-before','saved-after']:
+            if bundle=='saved-after':expected['project.arcadia']=expected['project.arcadia'].replace(b'position { x 120.0; y 80.0; };',b'position { x 190.0; y 80.0; };',1)
+            prefix='native/'+bundle+'/'
+            actual={n[len(prefix):]:raw(n) for n in manifest['members'] if n.startswith(prefix)}
+            require(actual==expected,bundle+' exact source-byte oracle')
+            receipt=obj('native/bundle-checks/'+bundle+'.result.json')
+            report=obj('native/bundle-checks/'+bundle+'.stdout.json')
+            expected_entry=result['cwd'].replace('\\','/').rstrip('/')+'/.local/union-native/'+bundle+'/project.arcadia'
+            require(len(receipt['command'])==4 and receipt['command'][0]==executables['arcadia'] and receipt['command'][1]=='check' and receipt['command'][2].replace('\\','/')==expected_entry and receipt['command'][3]=='--json',bundle+' exact CLI command')
+            require(datetime.fromisoformat(receipt['start'])<=datetime.fromisoformat(receipt['finish']),bundle+' CLI time order')
+            require(receipt['files']=={n:pin(b) for n,b in actual.items()} and receipt['filesUnchanged'] is True,bundle+' file receipts')
+            require(receipt['binary']==binaries['arcadia'] and receipt['buildReceipt']==pin(raw('build/result.json')),bundle+' CLI build receipt')
+            require(receipt['producer']==pin(raw('native/check-saved-bundles.py')),bundle+' producer')
+            require(receipt['exitCode']==0 and report['status']=='checked',bundle+' CLI status')
+            for field,suffix in [('stdout','.stdout.json'),('stderr','.stderr.log')]:require(receipt[field]==pin(raw('native/bundle-checks/'+bundle+suffix)),bundle+' '+field)
+            require(not raw('native/bundle-checks/'+bundle+'.stderr.log'),bundle+' empty stderr')
+            require(len(report['diagnostics'])==4 and all(d['severity']=='warning' for d in report['diagnostics']),bundle+' warnings')
+            require(receipt['diagnostics']==[{k:d[k] for k in ('severity','code','object_id')} for d in report['diagnostics']],bundle+' diagnostic receipt')
+            require(not report['changes'] and not report['written'] and report['identities_to_stabilize']==0,bundle+' nonmutating stable-ID check')
+        summary=obj('native/bundle-checks/summary.json')
+        require(summary['status']=='PASS' and summary['runs']==['saved-before','saved-after'] and summary['producer']==pin(raw('native/check-saved-bundles.py')),'bundle summary')
+        print('PASS:',len(manifest['members']),'members;',len(captures),'captures;',len(images),'unaltered frames; 707 build inputs; native closure and both saved-byte/CLI receipt oracles.')
+        print('No archived code executed. Screenshot interpretation and full parsed-model equality are not machine-verified.')
+if __name__=='__main__':main()
diff --git a/harness/ordinary-text-integration-20260913.md b/harness/ordinary-text-integration-20260913.md
index 501db0f8..011c0672 100644
--- a/harness/ordinary-text-integration-20260913.md
+++ b/harness/ordinary-text-integration-20260913.md
@@ -134,7 +134,7 @@ outside the selected scope. The filters cover source-symbol tests, Text workspac
 tests, surrounding view tests and the palette/drawer integration cases. The
 updated close assertions and both recovery-warning regressions passed. The
 matching Windows GUI, CLI and server then built successfully from `f714a25` with
-the same final inputs. Native acceptance remains pending at this checkpoint.
+the same final inputs. The native workflow is recorded separately below.
 
 [The subsequent gate package](experiments/ordinary-text-gates-20260913/README.md)
 preserves these eight closed gates, both failed lint attempts, complete listing
@@ -143,3 +143,50 @@ receipts. Its 8,624,040-byte ZIP has SHA-256
 `b0da6611dd86e83c8f779c025786e473834298f9b9990b19a76b250b61137780`.
 Independent review verified all 50 stored members against raw captures, source
 relationships, the safe read-only verifier, and prospective Git-clean outer bytes.
+
+## Native Windows workflow
+
+The combined GUI built from `f714a25` ran from 14:16:18 to 14:32:24 UTC on
+2026-09-13 and closed with exit zero and empty stdout/stderr. Its 117,674,496-byte
+executable had SHA-256
+`f7405a95a499c31972934b8efdd8a37ee3981cefc5b2b7c82a4f16c4e5a935ed`
+before and after the trial, matching the captured build receipt and final 707
+inputs. The original 451-byte input remained unchanged.
+
+Computer Use exercised creation of a new activity in Model explorer, its compact
+included declaration in Text, Save As, a graphical move, model Undo and Redo,
+a second Save As, New, and reopening that saved model from Home. The move changed
+the source x coordinate from 120.0 to 190.0; Undo restored 120.0 and the saved
+state, and Redo restored 190.0. The authored empty `port_anchors` field, spacing,
+comment and include remained intact. Reopening showed the same 190.0 source
+coordinate and the new activity.
+
+The Problems drawer navigated from a current warning to the included activity
+at line 2. Inserting a temporary comment removed the old warning rows and
+underlines while reporting drafts pending. Apply all restored the four warnings
+with the included declaration at line 3; selecting its warning highlighted that
+updated declaration. Undo model change removed the comment, restored line 2
+diagnostics and returned the saved state before normal exit. These observations
+establish visible invalidation and refresh; they do not simulate delivery of a
+previously captured stale UI message. Automated authority regressions cover that
+separate case.
+
+An exact-byte oracle checked both saved bundles: each has precisely two source
+files, the new activity identity is stable, and their only difference is the
+intended x-coordinate change. Both passed `arcadia check <entry> --json` using the
+matching built CLI, without writes or stderr. Each reported the expected four
+modeling warnings for two unallocated activities without behavior context and
+zero errors. The checks do not assert equality of the entire in-memory Project;
+saved bytes, CLI validation, GUI observations and process receipts are distinct
+evidence. Original screenshots retain intermediate file-dialog states. The
+operator encountered an unavailable UI Automation value-setting call, reported
+in the tool transcript rather than the screenshot archive; the exact intended
+path was visibly verified before saving.
+
+Independent native review inspected 25 original frames, checked all 49 capture
+metadata records, and independently reconstructed the source-byte oracles and
+receipt relationships. It found no functional defect or source corruption. Its
+one evidence-attribution wording correction is resolved above. The review does
+not certify exhaustive accessibility, Linux, source-8 composition or release
+readiness. The raw trial and review are in the
+[native evidence package](experiments/ordinary-text-native-20260913/README.md).