Todo 47.3 Bare Volume Numeric Guard Plan

Status: in_progress

Goal

Close the final named volume-token gap by applying the existing malformed-number guard to bare volume to, volume at, and volume= forms.

Scope

Add RED tests for volume to 40.5, volume at 1,000, and volume=40.5.
Assert no fallback, no port call, and structured invalid arguments.
Preserve valid bare integer forms such as volume to 40, volume at 40, and volume=40.

Files

Modify: src/agent_lab/application/events/builtin_plugins.py
Modify: tests/test_builtin_event_plugins.py

Verification

UV_CACHE_DIR=.uv-cache uv run pytest tests/test_builtin_event_plugins.py -q
UV_CACHE_DIR=.uv-cache uv run pytest
git diff --check