Allow self-isolating linked package tests without inherited PM_PATH
priority: 1 · risk: –
test_runs: 1 (last: passed)
comments: 6
resolution: Added explicit pm_context_mode=none across parser, SDK types, CLI/MCP contracts, help, completion, execution preflight, and docs; non-PM commands run only in isolated or snapshot workspaces, with PM_GLOBAL_PATH still sandboxed.