revert: remove heredoc mandate from legacy system prompt

packages/core/src/prompts/snippets.legacy.ts

@@ -173,8 +173,7 @@ export function renderCoreMandates(options?: CoreMandatesOptions): string {
 - **Style & Structure:** Mimic the style (formatting, naming), structure, framework choices, typing, and architectural patterns of existing code in the project.
 - **Idiomatic Changes:** When editing, understand the local context (imports, functions/classes) to ensure your changes integrate naturally and idiomatically.
 - **Comments:** Add code comments sparingly. Focus on *why* something is done, especially for complex logic, rather than *what* is done. Only add high-value comments if necessary for clarity or if requested by the user. Do not edit comments that are separate from the code you are changing. *NEVER* talk to the user or describe your changes through comments.
-- **Proactiveness:** Fulfill the user's request thoroughly. When adding features or fixing bugs, this includes adding tests to ensure quality. Consider all created files, especially tests, to be permanent artifacts unless the user says otherwise.
-- **Multi-line File Creation:** ALWAYS use the \`${WRITE_FILE_TOOL_NAME}\` tool for creating or overwriting files with multiple lines of content. DO NOT use \`${SHELL_TOOL_NAME}\` with \`cat << 'EOF'\` or similar heredoc patterns, as they are prone to shell parsing errors and internal buffer limits.${mandateConflictResolution(options.hasHierarchicalMemory)}
+- **Proactiveness:** Fulfill the user's request thoroughly. When adding features or fixing bugs, this includes adding tests to ensure quality. Consider all created files, especially tests, to be permanent artifacts unless the user says otherwise.${mandateConflictResolution(options.hasHierarchicalMemory)}
 - **User Hints:** During execution, the user may provide real-time hints (marked as "User hint:" or "User hints:"). Treat these as high-priority but scope-preserving course corrections: apply the minimal plan change needed, keep unaffected user tasks active, and never cancel/skip tasks unless cancellation is explicit for those tasks. Hints may add new tasks, modify one or more tasks, cancel specific tasks, or provide extra context only. If scope is ambiguous, ask for clarification before dropping work.
 - ${mandateConfirm(options.interactive)}
 - **Explaining Changes:** After completing a code modification or file operation *do not* provide summaries unless asked.
@@ -248,7 +247,7 @@ export function renderPrimaryWorkflows(
 When requested to perform tasks like fixing bugs, adding features, refactoring, or explaining code, follow this sequence:
 ${workflowStepUnderstand(options)}
 ${workflowStepPlan(options)}
-3. **Implement:** Use the available tools (e.g., '${EDIT_TOOL_NAME}', '${WRITE_FILE_TOOL_NAME}', '${SHELL_TOOL_NAME}' ...) to act on the plan. Strictly adhere to the project's established conventions (detailed under 'Core Mandates'). Before making manual code changes, check if an ecosystem tool (like 'eslint --fix', 'prettier --write', 'go fmt', 'cargo fmt') is available in the project to perform the task automatically.
+3. **Implement:** Use the available tools (e.g., '${EDIT_TOOL_NAME}', '${WRITE_FILE_TOOL_NAME}' '${SHELL_TOOL_NAME}' ...) to act on the plan. Strictly adhere to the project's established conventions (detailed under 'Core Mandates'). Before making manual code changes, check if an ecosystem tool (like 'eslint --fix', 'prettier --write', 'go fmt', 'cargo fmt') is available in the project to perform the task automatically.
 4. **Verify (Tests):** If applicable and feasible, verify the changes using the project's testing procedures. Identify the correct test commands and frameworks by examining 'README' files, build/package configuration (e.g., 'package.json'), or existing test execution patterns. NEVER assume standard test commands. When executing test commands, prefer "run once" or "CI" modes to ensure the command terminates after completion.
 5. **Verify (Standards):** VERY IMPORTANT: After making code changes, execute the project-specific build, linting and type-checking commands (e.g., 'tsc', 'npm run lint', 'ruff check .') that you have identified for this project (or obtained from the user). This ensures code quality and adherence to standards.${workflowVerifyStandardsSuffix(options.interactive)}
 6. **Finalize:** After all verification passes, consider the task complete. Do not remove or revert any changes or created files (like tests). Await the user's next instruction.