fix(read): fixed column truncation mutating snapshot with display content

- Column truncation is now applied to a cloned array so `collectedLines` retains on-disk content for snapshot recording.
- Snapshots bound to hashline TAGs now hold the original file text, preventing hash-mismatch failures on subsequent edits to files with long lines.
- Added regression tests covering full-file, range, multi-range reads and a live edit-after-read scenario.

packages/coding-agent/examples/sdk/13-sql-sessions.ts

@@ -17,8 +17,9 @@
  * `BlobStore` keep writing to `~/.omp/agent/...`. Reach for object storage
  * if you need those off-host too.
  */
-import { SQL } from "bun";
+
 import { createAgentSession, SessionManager, SqlSessionStorage } from "@oh-my-pi/pi-coding-agent";
+import { SQL } from "bun";
 
 // Pick one — Bun.SQL auto-detects the dialect from the URL scheme.
 //