ci: add CodSpeed benchmark reporting

[Benoît Cortier (CBenoit)]

Report focused codec and replay workloads separately via CodSpeed while keeping ordinary Criterion and Hyperfine paths unchanged.

Gate service upload until the repository integration and an approved wall-time runner are configured.

Co-authored-by: Copilot App 223556219+Copilot@users.noreply.github.com

[Copilot]

🔵 Needs a closer look

The CodSpeed workflow has a cache-key inconsistency and warrants human review.

Pull request overview

Adds optional CodSpeed reporting for codec and replay benchmarks while preserving existing Criterion and Hyperfine workflows.

Changes:

• Adds CodSpeed benchmark integration and configuration.
• Adds gated GitHub Actions workflows.
• Documents usage and updates dependencies.

File summaries

File	Summary
xtask/README.md	Documents CodSpeed workflows and usage.
crates/ironrdp-bench/Cargo.toml	Adds optional CodSpeed support.
crates/ironrdp-bench/benches/capture_replay.rs	Enables CodSpeed replay benchmarks.
crates/ironrdp-bench/benches/bench.rs	Enables CodSpeed codec benchmarks.
codspeed.yml	Defines wall-time replay commands.
Cargo.lock	Locks CodSpeed dependencies.
.github/workflows/codspeed.yml	Adds gated CodSpeed jobs.

Review details

Suppressed comments (1)

.github/workflows/codspeed.yml:43

• This uses a different cache-key prefix (codspeed-corpus) from the existing corpus cache (benchmark-corpus in .github/workflows/ci.yml:211), so CodSpeed cannot reuse the already populated cache and will redownload the same captures on every cold CodSpeed run. Reuse the existing key if the cache is intended to be shared, as the README states.

          key: ${{ runner.os }}-codspeed-corpus-${{ hashFiles('crates/ironrdp-bench/corpus.toml') }}

• Files reviewed: 6/7 changed files
• Comments generated: 0
• Review effort level: Lite

[github-actions]

PR #1949 adds CodSpeed benchmark reporting: a gated workflow (simulation on push/PR/dispatch behind CODSPEED_ENABLED; walltime dispatch-only behind a maintainer-set runner variable), a root codspeed.yml with three walltime commands matching the capture-replay-bench CLI, a cfg-gated codspeed feature aliasing codspeed-criterion-compat in both benches, generated Cargo.lock changes, and README docs that accurately describe the gating and OIDC/no-secret posture. Reviewed independently: job gating prevents fork PRs from reaching the walltime runner; prepare/verify run outside timed iterations; corpus use is digest-verified and consistent with existing CI conventions. Only publishable issue is the specialist's valid low-severity Cargo.toml redundancy, accepted unchanged; no other correctness, safety, or maintainability impact found.

[github-actions]

PR 1949 adds CodSpeed benchmark reporting: a new gated workflow (simulation plus manual-only walltime), a root codspeed.yml walltime manifest, an optional codspeed feature swapping codspeed-criterion-compat for Criterion in the two bench targets, and README documentation. Independent inspection found no correctness, safety, or protocol defects: the feature-gated criterion alias compiles in both configurations, the optional dependency correctly lives in [dependencies] because optional dev-dependencies are unsupported, the walltime job is properly gated against dispatcher-controlled runners, and benchmark identities in docs match the code. Only low-severity maintainability duplication was found, matching the code-compressor candidates, which are accepted.