diff --git a/docs/development/OpenNexus生产化实施进度-2026-09-08.md b/docs/development/OpenNexus生产化实施进度-2026-09-08.md
index ec3a8d3..12e34d8 100644
--- a/docs/development/OpenNexus生产化实施进度-2026-09-08.md
+++ b/docs/development/OpenNexus生产化实施进度-2026-09-08.md
@@ -625,3 +625,13 @@ Core 的独立数据目录目前不等于已授权 Vault。Python 旧笔记写
 - 首轮全目标编译发现删除决策 fingerprint 仍需要生产 hash 导入，已恢复其非 test 范围，同时移除 sync_inbox 中不再使用的 fs 导入；该问题在全目标回归期间发现，未将仅 lib test 编译通过当作全部目标通过。
 - 外部变更扫描、初始绑定对账和部分逻辑记录/API 仍有整块读取；未将这些功能测试当作 RSS 基准或完整强杀/断电矩阵。大附件端到端内存与完整生产化目标继续未完成。
 - 最终 desktop 全目标累计 135 通过、12 ignored（库 120、Host 8、其余集成 7），包括实际 Sync 服务与故障恢复集成；日志 `.build/sync-conflict-stream-full.log`。desktop 全目标 Clippy -D warnings 通过，日志 `.build/sync-conflict-stream-clippy.log`。本轮没有重新执行 ignored 沙箱长时验收，全部生产化条件仍未满足。
+
+
+## 增量：扫描、首次对账与重新绑定的流式读取
+
+- 共用 hash_file_info 返回实际读取的摘要与长度；sync_file_info 对普通文件有界流式读取，对逻辑记录仍最多读取 1 MiB 加 1 字节并执行现有 schema 校验。sync_discover 不再读入整块文件，发现变化后用 store_payload_file 保存经过复核的快照再提交观察记录与 outbox。
+- 首次合并预览使用流式摘要/实际长度，确认后的本地准备使用流式 payload 快照，内容变化仍拒绝旧预览。Workspace.scan 的 Markdown 摘要也改为有界读取，避免 UI 扫描先分配整个大文件。
+- 空远端绑定原先只调用 Markdown scan；重新绑定时已观察过的附件没有新 outbox，后续 discover 也可能因摘要未变而跳过。本轮改为枚举同步白名单路径（含允许的附件/记录），归档旧绑定队列后为当前文件准备流式快照与本地写入意图，再建立新绑定队列；不再仅以 Markdown 集合作为绑定数据集。
+- 新增 100 MiB Markdown 与 100 MiB 附件测试，分别走首次合并与空远端绑定：仅改末字节即可使旧预览失效，绑定后重复发现不增加事件，UI scan 后的外部修改仍被 discover 识别一次，重开不重复；切换远端 Vault/账号重新绑定时两类文件均进入新队列且原 file_id 保持。测试通过，耗时 10.36 秒，日志 `.build/sync-discovery-stream-large.log`。先前同步回归 17 项通过，日志 `.build/sync-discovery-stream-tests.log`。
+- 测试补充阶段修正了 Binding 不实现 Debug 时不能使用 unwrap_err 的测试写法，没有为调试输出扩大生产类型的可见字段。上述测试不是真实进程峰值内存测量、10000 文件基准或完整首次绑定故障矩阵；这些验收仍需继续。
+- 最终 desktop 全目标累计 136 通过、12 ignored（库 121、Host 8、其余集成 7），包含真实 Sync 服务与故障恢复集成，日志 `.build/sync-discovery-stream-full.log`；desktop 全目标 Clippy -D warnings 通过，日志 `.build/sync-discovery-stream-clippy.log`。仍需独立进程峰值内存和完整基准/部署/发布验收，完整生产化目标未完成。
diff --git a/frontend/src-tauri/src/payloads.rs b/frontend/src-tauri/src/payloads.rs
index c6cc029..84bf036 100644
--- a/frontend/src-tauri/src/payloads.rs
+++ b/frontend/src-tauri/src/payloads.rs
@@ -165,6 +165,21 @@ pub(crate) fn validate_record(file: &mut fs::File, path: &str, size: u64) -> Res
     Ok(())
 }
 pub(crate) fn hash_file(path: &Path) -> Result<String> {
+    hash_file_info(path).map(|(digest, _)| digest)
+}
+pub(crate) fn sync_file_info(source: &Path, path: &str) -> Result<(String, u64)> {
+    if crate::records::is_record(path) {
+        let mut bytes = Vec::new();
+        fs::File::open(source)?
+            .take(1024 * 1024 + 1)
+            .read_to_end(&mut bytes)?;
+        crate::records::validate(path, &bytes)?;
+        Ok((hash(&bytes), bytes.len() as u64))
+    } else {
+        hash_file_info(source)
+    }
+}
+fn hash_file_info(path: &Path) -> Result<(String, u64)> {
     let mut file = fs::File::open(path)?;
     let mut buffer = vec![0u8; VERIFY_BUFFER_BYTES];
     let mut hasher = Sha256::new();
@@ -180,7 +195,7 @@ pub(crate) fn hash_file(path: &Path) -> Result<String> {
         }
         hasher.update(&buffer[..count]);
     }
-    Ok(format!("{:x}", hasher.finalize()))
+    Ok((format!("{:x}", hasher.finalize()), total))
 }
 pub(crate) fn verify(path: &Path, digest: &str, size: u64) -> Result<()> {
     open_verified(path, digest, size).map(drop)
diff --git a/frontend/src-tauri/src/sync_discovery.rs b/frontend/src-tauri/src/sync_discovery.rs
index 82ac11d..b4575b3 100644
--- a/frontend/src-tauri/src/sync_discovery.rs
+++ b/frontend/src-tauri/src/sync_discovery.rs
@@ -1,7 +1,7 @@
 //! Reconcile externally edited files against committed snapshots, never against UI read caches.
-use crate::workspace::{hash, HostError, Result, Workspace};
+use crate::workspace::{HostError, Result, Workspace};
 use rusqlite::{params, OptionalExtension};
-use std::{collections::HashSet, fs, io::Read, path::Path};
+use std::{collections::HashSet, fs, path::Path};
 use uuid::Uuid;
 /// File transport only. Logical records receive their own versioned whitelist separately.
 pub fn allowed(path: &str) -> bool {
@@ -93,20 +93,7 @@ impl Workspace {
         let mut changes = 0;
         for path in paths {
             let target = self.resolve(&path)?;
-            if fs::metadata(&target)?.len() > 104857600 {
-                return Err(HostError::new("FILE_TOO_LARGE"));
-            }
-            let mut bytes = Vec::new();
-            fs::File::open(&target)?
-                .take(104857601)
-                .read_to_end(&mut bytes)?;
-            if bytes.len() > 104857600 {
-                return Err(HostError::new("FILE_TOO_LARGE"));
-            }
-            if crate::records::is_record(&path) {
-                crate::records::validate(&path, &bytes)?;
-            }
-            let digest = hash(&bytes);
+            let (digest, _) = crate::payloads::sync_file_info(&target, &path)?;
             let previous = self.entry(&path)?;
             let observed: Option<(String, String, bool)> = if let Some(entry) = &previous {
                 self.db
@@ -129,9 +116,8 @@ impl Workspace {
                 continue;
             }
             // Confirm the snapshot without writing back over an external editor.
-            crate::payloads::verify(&target, &digest, bytes.len() as u64)?;
             let operation = Uuid::new_v4().to_string();
-            self.store_payload(&operation, &bytes)?;
+            self.store_payload_file(&operation, &target, &digest)?;
             let file_id = previous.map_or_else(|| Uuid::new_v4().to_string(), |e| e.file_id);
             let tx = self.db.transaction()?;
             tx.execute("INSERT INTO files VALUES (?1,?2,?3,1,0) ON CONFLICT(path) DO UPDATE SET hash=excluded.hash,revision=files.revision+1,deleted=0",params![file_id,path,digest])?;
diff --git a/frontend/src-tauri/src/sync_initial.rs b/frontend/src-tauri/src/sync_initial.rs
index 4e61eb2..6a5a85e 100644
--- a/frontend/src-tauri/src/sync_initial.rs
+++ b/frontend/src-tauri/src/sync_initial.rs
@@ -6,7 +6,9 @@ use crate::{
 };
 use rusqlite::{params, OptionalExtension};
 use serde::{Deserialize, Serialize};
-use std::{collections::BTreeMap, fs};
+use std::collections::BTreeMap;
+#[cfg(test)]
+use std::fs;
 use uuid::Uuid;
 #[derive(Clone, Serialize, Deserialize)]
 pub struct Snapshot {
@@ -36,17 +38,11 @@ impl Workspace {
             .into_iter()
             .map(|path| {
                 let source = self.resolve(&path)?;
-                if fs::metadata(&source)?.len() > 104857600 {
-                    return Err(HostError::new("FILE_TOO_LARGE"));
-                }
-                let bytes = fs::read(source)?;
-                if crate::records::is_record(&path) {
-                    crate::records::validate(&path, &bytes)?;
-                }
+                let (hash, size) = crate::payloads::sync_file_info(&source, &path)?;
                 Ok(Local {
                     path,
-                    hash: hash(&bytes),
-                    size: bytes.len(),
+                    hash,
+                    size: size as usize,
                 })
             })
             .collect()
@@ -131,11 +127,14 @@ impl Workspace {
         let mut prepared = Vec::new();
         for item in local {
             let operation = Uuid::new_v4().to_string();
-            let bytes = fs::read(self.resolve(&item.path)?)?;
-            if hash(&bytes) != item.hash {
-                return Err(HostError::new("SYNC_PREVIEW_CHANGED"));
-            }
-            self.store_payload(&operation, &bytes)?;
+            self.store_payload_file(&operation, &self.resolve(&item.path)?, &item.hash)
+                .map_err(|error| {
+                    if error.code == "REVISION_CONFLICT" {
+                        HostError::new("SYNC_PREVIEW_CHANGED")
+                    } else {
+                        error
+                    }
+                })?;
             let old = self.entry(&item.path)?;
             let remote = snapshot
                 .items
@@ -271,6 +270,98 @@ mod tests {
         }
     }
     #[test]
+    fn hundred_mib_discovery_preview_and_rebinding_preserve_all_current_files() {
+        use std::io::{Seek, SeekFrom, Write};
+        for initial in [false, true] {
+            let root = tempfile::tempdir().unwrap();
+            fs::create_dir(root.path().join("attachments")).unwrap();
+            let source = root.path().join("large.md");
+            let mut file = fs::File::create(&source).unwrap();
+            let block = vec![b'a'; 64 * 1024];
+            for _ in 0..1600 {
+                file.write_all(&block).unwrap();
+            }
+            file.sync_all().unwrap();
+            drop(file);
+            fs::copy(&source, root.path().join("attachments/large.bin")).unwrap();
+            let mut ws = Workspace::open(root.path()).unwrap();
+            let snapshot = Snapshot {
+                boundary: 0,
+                items: Vec::new(),
+            };
+            let binding = if initial {
+                let preview = ws
+                    .sync_preview("https://sync.example", "remote", "account", &snapshot)
+                    .unwrap();
+                let mut file = fs::OpenOptions::new().write(true).open(&source).unwrap();
+                file.seek(SeekFrom::End(-1)).unwrap();
+                file.write_all(b"b").unwrap();
+                file.sync_all().unwrap();
+                drop(file);
+                assert_eq!(
+                    ws.sync_bind_initial(
+                        "https://sync.example",
+                        "remote",
+                        "account",
+                        &snapshot,
+                        &preview.fingerprint
+                    )
+                    .err()
+                    .unwrap()
+                    .code,
+                    "SYNC_PREVIEW_CHANGED"
+                );
+                let preview = ws
+                    .sync_preview("https://sync.example", "remote", "account", &snapshot)
+                    .unwrap();
+                ws.sync_bind_initial(
+                    "https://sync.example",
+                    "remote",
+                    "account",
+                    &snapshot,
+                    &preview.fingerprint,
+                )
+                .unwrap()
+            } else {
+                ws.sync_bind_empty("https://sync.example", "remote", "account")
+                    .unwrap()
+            };
+            assert_eq!(ws.sync_discover(&binding.id).unwrap(), 0);
+            ws.sync_capture(&binding.id).unwrap();
+            assert_eq!(ws.pending_count().unwrap(), 2);
+            let identity = ws.entry("large.md").unwrap().unwrap().file_id;
+            let mut file = fs::OpenOptions::new().write(true).open(&source).unwrap();
+            file.seek(SeekFrom::End(-1)).unwrap();
+            file.write_all(b"c").unwrap();
+            file.sync_all().unwrap();
+            drop(file);
+            ws.scan().unwrap();
+            assert_eq!(ws.sync_discover(&binding.id).unwrap(), 1);
+            assert_eq!(ws.entry("large.md").unwrap().unwrap().file_id, identity);
+            drop(ws);
+            ws = Workspace::open(root.path()).unwrap();
+            assert_eq!(ws.sync_discover(&binding.id).unwrap(), 0);
+            assert_eq!(ws.pending_count().unwrap(), 3);
+            ws.sync_unbind(&binding.id).unwrap();
+            let rebound = ws
+                .sync_bind_empty("https://sync.example", "another-vault", "another-account")
+                .unwrap();
+            assert_eq!(ws.pending_count().unwrap(), 2);
+            assert_eq!(
+                ws.db
+                    .query_row(
+                        "SELECT COUNT(*) FROM sync_jobs WHERE binding=?1",
+                        [&rebound.id],
+                        |r| r.get::<_, i64>(0)
+                    )
+                    .unwrap(),
+                2
+            );
+            assert_eq!(ws.sync_discover(&rebound.id).unwrap(), 0);
+            assert_eq!(ws.entry("large.md").unwrap().unwrap().file_id, identity);
+        }
+    }
+    #[test]
     fn initial_snapshot_cursor_waits_for_all_files_and_recovers_twenty_rounds() {
         for _ in 0..20 {
             for committed in [false, true] {
diff --git a/frontend/src-tauri/src/sync_state.rs b/frontend/src-tauri/src/sync_state.rs
index 685a050..8637564 100644
--- a/frontend/src-tauri/src/sync_state.rs
+++ b/frontend/src-tauri/src/sync_state.rs
@@ -71,7 +71,7 @@ impl Workspace {
                 .query_row("SELECT EXISTS(SELECT 1 FROM sync_bindings)", [], |r| {
                     r.get(0)
                 })?;
-        let entries = self.scan()?;
+        let paths = self.sync_paths()?;
         let id = Uuid::new_v4().to_string();
         // Rebinding explicitly starts from the current snapshot, never an old account's queue.
         if had_binding {
@@ -80,15 +80,30 @@ impl Workspace {
                 [],
             )?;
         }
-        for entry in entries.into_iter().filter(|e| !e.is_folder && !e.deleted) {
-            let queued: bool = self.db.query_row(
-                "SELECT EXISTS(SELECT 1 FROM outbox WHERE file_id=?1 AND state='pending')",
-                [&entry.file_id],
-                |r| r.get(0),
-            )?;
+        for path in paths {
+            let entry = self.entry(&path)?;
+            let queued = if let Some(entry) = &entry {
+                self.db.query_row(
+                    "SELECT EXISTS(SELECT 1 FROM outbox WHERE file_id=?1 AND state='pending')",
+                    [&entry.file_id],
+                    |r| r.get::<_, bool>(0),
+                )?
+            } else {
+                false
+            };
             if !queued {
-                let content = fs::read(self.resolve(&entry.path)?)?;
-                self.write(&entry.path, &entry.hash, &content, "local")?;
+                let source = self.resolve(&path)?;
+                let (digest, size) = crate::payloads::sync_file_info(&source, &path)?;
+                let operation = Uuid::new_v4().to_string();
+                self.store_payload_file(&operation, &source, &digest)?;
+                self.write_spooled_with_identity(
+                    &path,
+                    &digest,
+                    (&digest, size),
+                    "local",
+                    &operation,
+                    None,
+                )?;
             }
         }
         self.db.execute(
diff --git a/frontend/src-tauri/src/workspace.rs b/frontend/src-tauri/src/workspace.rs
index 13971ab..16af59c 100644
--- a/frontend/src-tauri/src/workspace.rs
+++ b/frontend/src-tauri/src/workspace.rs
@@ -298,8 +298,7 @@ impl Workspace {
                 });
                 continue;
             }
-            let content = fs::read(self.resolve(&path)?)?;
-            let digest = hash(&content);
+            let digest = crate::payloads::hash_file(&self.resolve(&path)?)?;
             let previous = self.entry(&path)?;
             if previous
                 .as_ref()