feat: import runtimes into poly-benc-rt wrapper

[ChefBingbong]

Auto-generated PR from staged changes.

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Note

Medium Risk
Large wiring refactor that changes runtime selection, error remapping, and display metadata to plugin dispatch; behavior now depends on correct plugin registration and trait implementations across multiple crates.

Overview
Refactors poly-bench-runtime into a thin wrapper around new per-language runtime crates (runtimes-go, runtimes-ts, runtimes-rust, runtimes-python) and shared poly-bench-runtime-traits, replacing in-crate Go/JS implementations with re-exports for backward compatibility.

Moves RuntimeConfig, Measurement, error mapping, and language display metadata to trait/plugin-driven dispatch: get_error_mapper/lang_display now resolve behavior via registered RuntimePlugins, and the registry gains plugin-provided LSP helpers/detectors plus an init_import_extractors initializer.

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Redundant PLUGINS array in three modules

Medium Severity

The same PLUGINS array (&[&GO_PLUGIN, &TS_PLUGIN, &RUST_PLUGIN, &PYTHON_PLUGIN]) is duplicated in error_mapping.rs, lang_display.rs, and registry.rs. Adding a new runtime requires updating all three; forgetting one causes inconsistent behavior (e.g., get_error_mapper returns None while create_runtime succeeds).

Additional Locations (2)

• poly-bench-runtime/src/lang_display.rs#L11-L13
• poly-bench-runtime/src/registry.rs#L16-L17