Explain: Improve phrasing around the last-value tool's output.

[mark-undoio]

We don't need to echo the "Now" part of the tool's output when it occurs, it's better to write something more descriptive. The prompting can drop explanations of the output format, which is now composed specifically for the LLM's benefit.

This should prevent (rare) confusion that's occurred since the recent tidy-up of this tool.

[Copilot]

Pull Request Overview

This PR improves the phrasing around the last-value tool's output to make it more descriptive and reduce potential confusion. The changes remove explanations about output format from the documentation (since the format is designed for LLM consumption) and transform the raw "Now = ..." output into a more natural description when presenting results.

Key Changes:

• Removed documentation explaining the "Was" and "Now" value format from the instructions
• Changed the output presentation to say "has just been assigned value X" instead of echoing "Now = X"

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
explain/instructions.md	Removed explanation of "Was" and "Now" output format that was confusing for users
explain/explain.py	Transformed raw "Now = ..." output into more descriptive phrasing

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