docs(examples): add benchSDK example benchmarks

[dtice25]

Summary

Rebases the examples branch onto the latest master (which added per-step concurrency/timeoutMs, the onScore hook, and --no-ingest dry-run mode) and updates the examples to cover those new primitives.

What's changed

• Rebased devin/examples onto origin/master to pick up recent @benchsdk/runner changes.
• Added benchmarks/examples/05-step-options.bench.ts — demonstrates ctx.step(..., { concurrency: N, timeoutMs: N }) for parallel step invocations.
• Added benchmarks/examples/06-scoring.bench.ts — demonstrates config.onScore, lowerIsBetter, and the exported score() helper for weighted composite scoring.
• Updated benchmarks/examples/README.md with --no-ingest / BENCHSDK_NO_INGEST instructions, the new examples, and corrected output expectations.
• Added --no-ingest notes to the header comments of the existing examples so they can be run locally without platform credentials.

Verification

• pnpm -r --filter "./packages/**" build succeeded.
• pnpm typecheck passed.
• All examples were exercised in --no-ingest mode, including the new step-options and scoring examples.

BENCHSDK_NO_INGEST=true pnpm tsx packages/benchsdk-runner/dist/bin.js run benchmarks/examples/05-step-options.bench.ts --iterations 1 --no-ingest
BENCHSDK_NO_INGEST=true pnpm tsx packages/benchsdk-runner/dist/bin.js run benchmarks/examples/06-scoring.bench.ts --iterations 5 --no-ingest

Link to Devin session: https://app.devin.ai/sessions/770c96fe577f4323ae5d7f8ca8b785dc
Requested by: @dtice25

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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.