feat(hashline): integrate oh-my-pi hashline pipeline

- Bump hashline crate to latest HEAD (286b510)
- Add global SnapshotStore (30 paths, 4 versions, 64MiB)
  - crates/jcode-app-core/src/tool/hashline_snapshots.rs
- Add no-op loop guard (3 identical no-ops → error)
  - crates/jcode-app-core/src/tool/hashline_loop_guard.rs
- read.rs: emit [path#TAG] header + record snapshots + seenLines
- hashline_edit: drift detection via snapshot hash
- edit.rs: optional tag field for str_replace hash verification
- system_prompt: document hashline patch format

Recovery engine (3-way merge + session-chain replay) deferred —
std::sync::RwLock + .await Send issue. Use tokio::sync::RwLock when
ready, or clone snapshot before await.

Co-Authored-By: Claude <noreply@anthropic.com>

Author: quangdang46

Cargo.lock

@@ -143,7 +143,7 @@ jcode-mempalace-adapter = { path = "../jcode-mempalace-adapter", optional = true
 flate2 = "1"
 tar = "0.4"
 tempfile = "3"
-hashline = { git = "https://github.com/quangdang46/hashline.git", rev = "1780f4b81333047323058041d3d0e64abce0c9ad", }
+hashline = { git = "https://github.com/quangdang46/hashline.git", rev = "286b5104aec108d2ddf4eb3d2c89e5c47ca5ccbc", }
 agentgrep = { git = "https://github.com/1jehuang/agentgrep.git", tag = "v0.1.3" }
 qrcode = { version = "0.14.1", default-features = false }
 # DCP integration (dynamic context pruning)

crates/jcode-app-core/Cargo.toml

@@ -1,5 +1,6 @@
 use super::{Tool, ToolContext, ToolOutput};
 use crate::bus::{Bus, BusEvent, FileOp, FileTouch};
+use crate::tool::hashline_snapshots;
 use anyhow::Result;
 use async_trait::async_trait;
 use hashline::{anchor, document::FileContent, hash as hashline_hash};
@@ -31,6 +32,10 @@ struct EditInput {
     new_string: String,
     #[serde(default)]
     replace_all: bool,
+    /// Optional hashline tag for drift verification. When present, the current
+    /// file hash must match the snapshot before any edit is applied.
+    #[serde(default)]
+    tag: Option<String>,
 }
 
 /// Write `content` to `path` atomically via temp file + rename.

crates/jcode-app-core/src/tool/edit.rs

@@ -1,5 +1,6 @@
 use super::{Tool, ToolContext, ToolOutput};
 use crate::bus::{Bus, BusEvent, FileOp, FileTouch};
+use crate::tool::hashline_snapshots;
 use anyhow::Result;
 use async_trait::async_trait;
 use hashline::{anchor, document::FileContent, hash as hashline_hash};
@@ -125,7 +126,7 @@ fn publish_edit_event(
 #[async_trait]
 impl Tool for HashlineEditTool {
     fn name(&self) -> &str {
-        "ffs hashline_edit"
+        "hashline_edit"
     }
 
     fn description(&self) -> &str {