perf: benchmark numeric stdlib

[tiye]

Summary

• define RFC 0116 for numeric standard-library benchmark coverage
• add stdlib-abs, stdlib-sum, stdlib-min-max, and stdlib-range-sum to qbench and cargo bench --bench core
• extend the machine-readable workload guard and record reproducible samples in PERFORMANCE.md

Validation

• cargo run --locked --release --bin qbench -- --json --iterations 1 --repeat 1
• cargo bench --locked --bench core
• make check

This PR is stacked on PR #58 and is intentionally not merged independently.

[Copilot]

Pull request overview

This PR expands benchmark coverage for the RFC 0113 numeric standard library by defining RFC 0116 and adding four matching workloads to both qbench and cargo bench --bench core, with accompanying CLI guard assertions and performance documentation updates.

Changes:

• Added stdlib-abs, stdlib-sum, stdlib-min-max, and stdlib-range-sum workloads to qbench and the core bench runner.
• Extended the CLI test that validates machine-readable qbench --json workload enumeration (and --list output).
• Documented the new workloads, reproducibility commands, and sample measurements; updated RFC scope references.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/cli_tools.rs	Extends the expected qbench workload name list to include the four new stdlib workloads.
src/bin/qbench.rs	Adds four numeric stdlib workloads to the qbench workload registry with expected values.
benches/core.rs	Adds the same four workloads to cargo bench --bench core, including iteration counts.
RFCs/0116-stdlib-benchmark-coverage.md	Introduces RFC 0116 specifying benchmark coverage/acceptance criteria for numeric stdlib workloads.
RFCs/0000-project-scope.md	Updates the “implemented RFCs” upper bound to RFC 0116.
README.md	Updates the documented RFC coverage range to include RFC 0116.
PERFORMANCE.md	Documents the new workloads, reproduction commands, and records sample benchmark results.

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