v0.1.0

• Establish the repository and shared Base development tooling.
• Record the organization-wide benchmarking audit and the two-repository Rust architecture.
• Incorporate scheduler consumer feedback on comparative preparation, layout controls, screening, and declared failure outcomes into the plan.
• Capture the lower-priority historical data, normalized comparison, and graph/analysis follow-up.
• Define a shared performance investigation record and template that retain rejected, invalid, and inconclusive attempts as well as adopted changes.
• Add versioned process records with explicit metric phases, sources, directions, and resolution, and Interval for measured-phase wall, CPU, and context-switch totals.
• Discover scenarios and variants from [package.metadata.base-benchmark], including unpublished packages and package-level defaults.
• Prepare labelled source trees into frozen, hashed executables with source and build identity, plus a same-source layout replica built beside the baseline.
• Run seeded random rounds under a host-wide lock with CPU placement, deadlines, bounded output, signal cancellation, and process-group cleanup; journal every sample and record completion state.
• Summarize per-round paired differences and resolution-aware ratios, and warn about missing placement, inconsistent directions, and changes within or reversed by the layout replica.
• Add the base-benchmark command with list, prepare, smoke, run, and summarize.
• Control launch layout: stage executables under equal-length paths, clear the workload environment to PATH and LC_ALL=C, start in the workspace root, and add seeded random stack padding to every sample.
• Build any number of layout replicas with --replicas N, and warn when variant comparisons have no replica or an unresolved one.
• Report exact two-sided sign tests, count differences below a metric's resolution as ties, show percentage changes only when every round resolves, never show counts as percentages, and compare metrics only under identical definitions.
• Add a microsecond-resolution cpu_time total, and declare the tick-sampled user and system split at 10 ms.
• Reject campaigns whose records differ in workload or signature, or whose artifacts run a variant with different parameters.
• Record cargo -Vv, build-affecting environment variables, Cargo configuration files, and the Git state of out-of-tree path dependencies; recorded mode requires all of them to match and be committed.
• Add measure-arguments for screening and recorded runs, show resolved baseline variants, and add Workspace::smoke_executable.
• Split the runner into a default runner feature so workloads link only records and Interval.
• Use the fixed, shared host lock /tmp/base-benchmark-host.lock, write metadata atomically, fail samples whose escaped descendants hold the output open, retry busy executables, and handle signals process-wide: the first cancels guarded work, including preparation between builds, and a second exits.
• Take the scenario positionally in base-benchmark run, and reject a repeated --manifest-path.
• Never follow a symbolic link at the shared lock path, open an existing lock without O_CREAT so other users can share it under fs.protected_regular, and widen permissions only on a lock file created exclusively.
• Compute sign tests in logarithms, so long campaigns do not underflow to zero.
• Record path dependencies as unknown when Cargo metadata cannot be read, and reject them in recorded mode; filter metadata to the host platform, and include ~/.cargo configuration when $CARGO_HOME is unset.
• Leave signals that were ignored at startup alone on Linux, and treat unavailable values as compatible with any statistic of the same metric.