Add bounded concurrent API requests with shared accounting

[0thernet]

Outcome

The memory benchmark transport can now send up to four independent API requests together under one shared spending ledger. A finite plan reserves each group before sending, preserves dependency checkpoints and waits for in-flight requests to finish before stopping on a failure.

Interrupted groups retain unknown charges until an explicit, reviewed accounting closure. Closure cannot resume the run, retry a request or turn a captured response into an accepted result. Existing campaign runners continue to use the serial transport unless an experiment selects the new API.

Contract impact

Adds versioned benchmark-only plan, journal, checkpoint and batch-accounting records with bounded sizes, plus their cost registry and usage guide. Existing serial request, capture, budget and ledger formats are unchanged. The library, stored Oh data and packaged entry points are unchanged.

Verification

• 84 focused tests, 2,744 assertions passed, including 478 invented requests with equal serial/concurrent results and cost accounting across 120 groups and 24 sessions.
• Script and strict fixture typechecks passed; 52 cost surfaces validated; independent AI source review found no remaining issues.
• Package dry-run inspected: 560 files, 14.51 MB unpacked. No credentials or private research data included.
• Required CI aggregate on the final head and base; results will be recorded here.

Tests use invented responses. This change makes no provider-quality, throughput or benchmark-performance claim.

[vercel]

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Project	Deployment	Actions	Updated
oh-beam-reader-runtime	Ready	Preview	Oct 1, 2026 3:41pm UTC
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Project	Deployment	Actions	Updated
oh-computer	Ignored	Preview	Oct 1, 2026 3:41pm UTC