July 2025 (2025-07) — Key MCMC enhancements for MaCh3: implemented a DelayedMR2T2 fitter with delayed rejection and refactored MCMC base classes and parameter utilities to boost fitting efficiency and robustness. Introduced parameter utilities and updated Fitter to support delayed rejection, enabling more reliable proposals and faster convergence. Enhanced diagnostic plotting for MCMC analysis, including labels, legend transparency, improved auto-correlation visuals, and conditional legends to reduce clutter in multi-file analyses. Strengthened input handling for diagnostics plots to improve stability and user experience. These changes accelerate model-fitting workflows, improve convergence diagnostics, and deliver clearer, more actionable insights for data-driven decision-making.

January 2025 (DUNE/MaCh3_DUNE) monthly summary focusing on key accomplishments, major fixes, and overall impact. Key features delivered: - Landmine test added to enable regression coverage for critical safety scenarios. Commit: 7622d1540753f569cafd0163aebffc1750ee9133. - CI workflow consolidation: removed separate configuration file in favor of a single CI workflow, simplifying maintenance and reducing surface area for misconfigurations. Commit: f972ce484e3180d1235eb1f18791eee5f6108fb0. - YAML/config bug fixes and environment path stabilization: corrected YAML parsing and aligned environment paths to ensure reliable pipeline execution. Commits: 0e10c3eca885fa90c2d8f450d43280bdc8111279 (YAML), 4f27f631e6bc3a256f04a3117ba92c875ca34d89 (branch test cleanup). - Testing groundwork and data discovery: initiated tests to locate TDR era inputs, enabling future data-driven validation. Commit: 99af6f5f7c497fd73cf36ecc35d7ef9d8aec1390. - EventRates integration readiness: updated event rates configuration to reflect current parameters. Commit: d6f6acfaa171dd8b9e8a5d2afb4ab4673e7f3788. - CVMFS mounting improvements and containerization: implemented adjustments to mount CVMFS within container and started Ubuntu-based container provisioning to support EventRates CI pipelines. Commits: 2c2e277af11b6b5cc8cb4de537982b5b8f04409c, 2f65c6b875311349fcfe0187516fbe22cfff2b8f. - Install transition and environment setup relocation: migration from make to make install and relocation of environment setup for cleaner pipelines. Commits: 8356efa720a762c15eb0e822e7086e6422fa07be, 84f3926a583a573ae307fdacaf816bb01fcd04f9. - Workflow stabilization and debugging hygiene: ongoing improvements to CI/CD workflows and removal of debugging artifacts to ensure reliable builds and clearer feedback loops. Commits: 4f31ada1302365bd26be99b9cfd2421ac89b4566, da3f71ed966ffa805534ed1a0eba52220fca3caa, cec6f2f55dba3439bb5e4ec34a6b771b532ee9b6. Major bugs fixed: - YAML and config issues resolved, correcting environment path handling and baseline assumptions. Examples include fixes in YAML config and baseline handling. Commits: 0e10c3eca885fa90c2d8f450d43280bdc8111279, 2ada4a732085130699b487776652dde33606be0d (baseline bug), 4db3ae807a971b8f64c51c0d0c8c19fc420dfdc2 (ROOT/containers). - Branch and test brittleness addressed: removed problematic core/develop branch test and aligned branch handling in CI. Commit: 4f27f631e6bc3a256f04a3117ba92c875ca34d89, d61c906b1ab23b3e48e53eeff1a1c0d5830babb0 (wrong branch). - Incorrect event rate oscillator and root/ROOT path issues fixed to ensure correct runtime behavior. Commits: 3dc1dfcc6faa332e46d0deb38c0f080e5c1167a4, 11349c76afcb130b22738af57e5547d05d911df7 (Docker path), 4b7ed40bd8069676a14031a9525b61dfb67e604c (Docker image). Overall impact and accomplishments: - The month delivered a more stable, test-driven CI/CD process with improved reliability for containerized workloads and EventRates pipelines. The new landmine test increases coverage for safety-critical scenarios and the unified CI workflow reduces maintenance overhead and accelerates feedback cycles. Infrastructure improvements, including an Ubuntu-based CVMFS runner and environment scripting, lay the groundwork for faster, repeatable deployments and easier onboarding for new contributors. These changes collectively improve development velocity, reduce risk in production pipelines, and demonstrate strong end-to-end capabilities across testing, configuration management, containerization, and CI/CD orchestration. Technologies/skills demonstrated: - CI/CD engineering and workflow consolidation - YAML/configuration management and debugging - Docker and Ubuntu containerization for CI runners - CVMFS mounting and container filesystem work - Bash scripting, environment provisioning, and shell usage - Test-driven development with regression test additions and data discovery - Root/EventRates integration awareness and workflow instrumentation