perf: benchmark OMP Codex transports

[wolfiesch]

Summary

• add an alternating paired benchmark for OMP Codex WebSocket and SSE transports
• capture redacted timing, token, tool-call, and transport diagnostics
• document measured results and their proof boundaries
• add focused tests for argument parsing, completion validation, aggregation, and secret-safe errors

Verification

• pnpm check
• pnpm test (1,469 tests passed)
• node --test scripts/benchmark-omp-codex-transport.test.mjs
• typos on the benchmark documentation, script, and tests
• git diff --check

[Copilot]

Pull request overview

Adds an OMP Codex transport benchmark harness (WebSocket vs SSE) to support measuring and reporting transport performance/diagnostics without handling credentials inside T4 Code, along with documentation and CI-integrated tests.

Changes:

• Introduces a Node CLI harness to run paired/alternating OMP benchmark runs and produce a redacted JSON report (timings, tokens, tool-call counts, transport diagnostics).
• Adds focused unit tests for argument parsing, prompt construction, event validation, aggregation, and secret-safe error reporting.
• Documents measured results, reproduction steps, and the benchmark’s proof boundaries.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
scripts/benchmark-omp-codex-transport.mjs	New benchmark harness + JSON parsing/aggregation and transport diagnostics collection.
scripts/benchmark-omp-codex-transport.test.mjs	New unit tests covering parsing, validation, aggregation, and bounded error messaging.
package.json	Wires the new benchmark test into the existing test:tooling suite.
docs/OMP_CODEX_TRANSPORT_BENCHMARK.md	Documents methodology, results, reproduction steps, and proof boundary.

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