feat(omp): route broad tool calls and cap direct results - #1066

Summary

• route broad shell, search, glob, URL, and oversized local-read calls to the existing context-mode MCP tools
• bound non-context-mode tool results to 16 KiB while preserving a UTF-8-safe head/tail and isError
• keep the original full result for OMP session extraction and add focused OMP adapter coverage

Verification

• bun run typecheck
• bun run build
• bunx vitest run tests/adapters/omp-plugin.test.ts tests/adapters/omp.test.ts tests/adapters/omp-usage.test.ts --reporter=dot (69 passed)

The standalone local OMP guard remains compatible with this upstream integration; no context-mode node_modules or user prompt rules are changed.