fix(openclaw-plugin): fix compact result mapping

[jcp0578]

Description

This PR fixes compact result handling in the OpenClaw OpenViking plugin so the /compact command returns a result structure that matches OpenClaw's expectations, without affecting compaction functionality.

Related Issue

N/A

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)
• Performance improvement
• Test update

Changes Made

• fixes compact result handling in the OpenClaw OpenViking plugin so the /compact command returns a result structure that matches OpenClaw's expectations
• Updated compact handling to use the most reliable available token values and archive metadata, while keeping successful compaction independent from optional context refresh failures.

Testing

• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have tested this on the following platforms:
  • Linux
  • macOS
  • Windows

Checklist

• My code follows the project's coding style
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published

Screenshots (if applicable)

N/A

Additional Notes

This change was validated in a remote Linux container running OpenClaw with the OpenViking plugin enabled. The compact flow was exercised against real session data to verify archive creation, token logging, and compact result behavior.

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