fix(ci): correct image digest separator

.wave/prompts/bench/solve.md

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+# SWE-bench Task: Fix the Issue
+
+You are solving a software engineering task from the SWE-bench benchmark.
+
+## Problem Statement
+
+{{ input }}
+
+## Instructions
+
+1. **Understand the problem**: Read the problem statement carefully. Identify which files and functions are involved.
+2. **Explore the codebase**: Use Read, Glob, and Grep to find the relevant source files. Understand the existing code before making changes.
+3. **Implement a minimal fix**: Make the smallest change that correctly solves the problem. Do not refactor unrelated code.
+4. **Verify your fix**: Run the project's test suite to confirm your changes work and do not break existing tests.
+
+## Constraints
+
+- Make minimal, focused changes — only modify what is necessary to fix the issue.
+- Do not add unrelated improvements, documentation, or refactoring.
+- Do not create new files unless the fix requires it.
+- Ensure all existing tests continue to pass after your changes.