[FEATURE] Let user subdivide a persisted session history into multiple blocks

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

Example:
1) User asks Claude to plan a nutrition tracking app
(Claude creates new session "Nutrition tracking app")
2) User later asks Claude to code an RSA cryptosystem, forgetting to start a new session
Result:

• Claude history contains one session titled "Nutrition tracking app" with wildly unrelated content.
• When asked to remedy, Claude responds, "conversation history is stored as-is and can't be split or reorganized. What you see is what's persisted."

Proposed Solution

Let user interactively direct Claude to flexibly split or combine session histor(ies).

Alternative Solutions

Copy / paste session content into separate doc, edit by hand - very cumbersome.

Priority

Medium - Would be very helpful

Feature Category

Interactive mode (TUI)

Use Case Example

see Problem Statement

Additional Context

_No response_