Dsh Better Edit

Key features

• If you've watched line 47 → 74 corrupt a file after an insert — this is for you.
• Verified against what was served.
• Edge caseswrong anchor impossible (verified), disk drift → reject+serve, shift above → nothing moves, repeats → unique/ambiguous, unseen → reject, batch → atomic.
• Every resolved line checked against read/diff/rejection rows.
• Session-scoped — sub-agent serves never validate main edits.