[codex] Speed up recent slow JUnit tests

[ScriptedAlchemy]

Summary

• shorten short-window LSP initialize timeout so hang-bound tests do not pay a fixed 2s floor
• use the setup-python interpreter path for Hermes generated Python checks on Windows
• trim duplicated fixture/server setup in slow dashboard and template-path tests

Validation

• cargo fmt --all -- --check
• git diff --check
• cargo clippy --workspace --all-targets --locked -- -D warnings
• cargo nextest run --locked -E 'test(broker_bounds_lsp_initialize_hangs) | test(test_hermes_generated_python_registers_memory_provider) | test(test_hermes_generated_memory_provider_is_discovered_from_active_home) | test(test_hermes_generated_python_degrades_gracefully_on_stock_hermes_api) | test(test_hermes_generated_python_handles_quoted_unicode_tracedecay_path) | test(literal_template_variant_paths_fall_back_to_discovery) | test(curation_preview_persists_across_dashboard_restarts)'
• cargo nextest run --locked --no-fail-fast -E 'binary(dashboard_api_test) | binary(hooks_lsp_suite) | binary(mcp_suite) | binary(agent_suite)'

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Latest commit: 92aeac0

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