fix(ci): correct image digest separator

.wave/prompts/speckit-flow/create-pr.md

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+You are creating a pull request for the implemented feature and requesting a review.
+
+Feature context: {{ input }}
+
+## Working Directory
+
+You are running in an **isolated git worktree** shared with previous pipeline steps.
+Your working directory IS the project root. The feature branch was created by a
+previous step and is already checked out.
+
+## Instructions
+
+1. Find the branch name and feature directory from the spec info artifact
+
+2. **Verify implementation**: Run `go test -race ./...` one final time to confirm
+   all tests pass. If tests fail, fix them before proceeding.
+
+3. **Stage changes**: Review all modified and new files with `git status` and `git diff`.
+   Stage relevant files — exclude any sensitive files (.env, credentials).
+
+4. **Commit**: Create a well-structured commit (or multiple commits if logical):
+   - Use conventional commit prefixes: `feat:`, `fix:`, `refactor:`, `test:`, `docs:`
+   - Write concise commit messages focused on the "why"
+   - Do NOT include Co-Authored-By or AI attribution lines
+
+5. **Push**: Push the branch to the remote repository:
+   ```bash
+   git push -u origin HEAD
+   ```
+
+6. **Create Pull Request**: Use `{{ forge.cli_tool }} {{ forge.pr_command }} create` with a descriptive summary. Write the PR body to a temp file to avoid shell injection:
+   ```bash
+   cat > /tmp/pr-body.md <<'EOF'
+   ## Summary
+   <3-5 bullet points describing the changes>
+
+   ## Spec
+   <link to spec file in specs/ directory>
+
+   ## Test Plan
+   <how the changes were validated>
+
+   ## Known Limitations
+   <any follow-up work needed>
+   EOF
+   {{ forge.cli_tool }} {{ forge.pr_command }} create --title '<concise title>' --body-file /tmp/pr-body.md
+   ```
+
+7. **Request Copilot Review**: After the PR is created, request a review from Copilot:
+   ```bash
+   {{ forge.cli_tool }} {{ forge.pr_command }} edit --add-reviewer "copilot"
+   ```
+
+## CONSTRAINTS
+
+- Do NOT spawn Task subagents — work directly in the main context
+
+## Output
+
+Produce a JSON status report matching the injected output schema.