Prevent plugin command aliases from becoming prompts
Added focused Python-port regressions for plugin, plugins, marketplace, and reload-plugins command routing, execution, stream, and turn-loop paths; narrowed runtime routing to honor explicit leading commands before fuzzy inventory matches.
Constraint: Task 10 scope limited changes to tests/test_porting_workspace.py plus narrow src parser/runtime fixes only if required.
Rejected: Test-only coverage without alias routing fix | route /plugin previously preferred fuzzy AddMarketplace over exact plugin command.
Confidence: high
Scope-risk: narrow
Directive: Keep --no-plugin-commands excluding plugin source hints; do not reinterpret that intentional filter as fallthrough.
Tested: python3 -m unittest tests.test_porting_workspace; python3 -m compileall src tests/test_porting_workspace.py; CLI route/turn-loop/filter smoke for /plugin, /plugins, /marketplace, /reload-plugins.
Not-tested: Full repository non-Python/Rust suites.
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