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tasks/ralph-loop-fixes/02-fix-spawnpi-print-mode.md

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+# 02. Replace `spawnPi` with `--print` mode and stdin piping
+
+meta:
+  id: ralph-loop-fixes-02
+  feature: ralph-loop-fixes
+  priority: P1
+  depends_on: []
+  tags: [implementation, utils]
+
+objective:
+- Replace `spawnPi()` so it invokes `pi --print` with prompt content piped via stdin, instead of using non-existent `--no-stream` and `--prompt` flags
+
+deliverables:
+- Modified `src/utils.ts` — `spawnPi()` function
+- Updated `src/executor.ts` — import and call site for `spawnPi`
+
+steps:
+- Open `src/utils.ts` and locate `spawnPi()`
+- Replace `spawnSync` args from `["--no-stream", "--prompt", promptFile, ...]` to `["--print"]`
+- Read the prompt file content and pass it as `input` to `spawnSync`
+- The `input` option accepts a string that is piped to the child process stdin
+- Keep `encoding`, `timeout`, and `maxBuffer` options as-is
+- Update the function signature if needed (no longer needs `promptFile` path, can take prompt content directly, or read it internally)
+
+tests:
+- Manual: Spawn pi with a simple prompt — verify it returns text output and exits cleanly
+- Manual: Verify `result.stdout` contains the pi response text (not NDJSON or event stream)
+
+acceptance_criteria:
+- `spawnPi()` exits with code 0 on successful execution
+- `result.stdout` contains plain text response from pi
+- No "Unknown options: --no-stream, --prompt" error
+
+validation:
+- Run `pi --print` with piped input manually to verify behavior
+- Check spawnSync call uses `["--print"]` args and `input` option
+
+notes:
+- Pi's `--print` flag runs in non-interactive mode: reads from stdin, writes to stdout, exits
+- `spawnSync` accepts an `input` option (string) that pipes to child stdin
+- Current broken args: `["--no-stream", "--prompt", promptFile]`
+- The `extractTextFromEvent()` function can be simplified or removed since `--print` returns plain text