pi-processes: v0.13.1

Patch Changes

• 1a92e29: Fold failed and killed processes into ! N failed and ■ N killed summary tokens in the status widget, mirroring the existing ✓ N done token. A new failure stays individual until the next process starts, then folds into the summaries.
• 9efa0c8: Inject the session PI_* variables (PI_SESSION_ID, PI_SESSION_FILE, PI_PROVIDER, PI_MODEL, PI_REASONING_LEVEL) into processes started via the process tool’s start action, mirroring the environment pi’s bash tool exposes.