[FEATURE] Add /compact command AFTER PLAN to summarise context instead of clearing it

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

Clearing context is often too destructive, while retaining full context preserves unnecessary detail and token weight. This creates friction in iterative workflows where only a distilled history is needed.

Proposed Solution

Introduce a /compact command that replaces the current conversation with a concise, structured summary of the session so far.

The summary should preserve:

the core goal or task
key decisions and constraints
important assumptions or definitions
current state of progress
This would retain far more useful context than the plan alone, without the cost or noise of full history.

Why This Matters

Enables longer, iterative workflows without context bloat
Reduces cognitive and token overhead
Avoids repeatedly restating background after plan mode
More aligned with how developers actually work

Priority

Critical - Blocking my work

Feature Category

CLI commands and flags

Use Case Example

_No response_