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Changelog

All notable changes to CDT++ are documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

1.0.0 - 2026-08-11

Release summary

CDT++ 1.0.0 is the final planned feature release of the C++23 spherical 2+1-dimensional reference implementation.

  • Compatibility: The supported source boundary is C++23 with the published GCC, Clang, AppleClang, and MSVC matrix. The project does not promise a stable binary ABI or package-registry distribution.
  • Scientific corrections: The release completes and independently validates all five 2+1D moves, Metropolis-Hastings proposal ratios and atomic transitions, exact-predicate geometry boundaries, run-owned RNG streams, and causal persistence metadata.
  • Supported surface: The default build is headless; CGAL/oneTBB bulk Delaunay operations and the macOS Qt viewer are explicit opt-ins. Historical toroidal and higher-dimensional prototypes are excluded from the supported API.
  • Limitations: Seeds replay stochastic inputs, not necessarily fresh cospherical CGAL topology. Resumable checkpoints continue the identical Markov chain only on the recorded producer toolchain; they are restart artifacts rather than portable interchange files. Parallelism does not extend to Pachner moves or concurrent manifold access.
  • Migration: Active development and new work move to causal-triangulations. After the v1.0.0 GitHub and Zenodo handoff, CDT++ enters a maintenance-only stabilization window and becomes read-only only when the owner completes the archival gate.

Added

  • [breaking] Modernize Python experiment workflows def276a

  • [breaking] Add offline C++/Rust comparison harness 45b080e

  • Restore reproducible archival rendering 2662df9

  • [breaking] Expose reported Metropolis transitions 16d1c76

  • Add initial-state loading and checkpoint resume e1305d6

Changed

  • Expose shared artifact lifecycle helpers 2f3ba57

  • Evaluate Boost alternatives to GMP and MPFR 9a02c39

  • Harden backend evaluation probes d5c3b71

  • Format transition validation f183f07

  • Verify unknown moves preserve transition traces 70ab238

  • Expect portable producer paths on Windows 5a32b1d

Documentation

  • Clean up archival documentation references 703b474

  • Exclude PCG shim from generated reference 7e8734f

Fixed

  • Serialize Dependabot automation per pull request 7567372

  • Deduplicate CodeRabbit review requests by revision 7f23d53

  • Bind Dependabot auto-merge to reviewed revision 72fc5a1

  • Harden Dependabot review rearming on head updates 5d571c8

  • Authenticate CodeRabbit review requests as maintainer 375c9ea

  • Require reviewed Dependabot merges and refresh tooling 7c3a84b

  • Restore MPFR builds and fail closed on polling errors 1d2e667

  • Prevent stale vcpkg 9e8d033

  • [breaking] Preserve coincident causal identities 3f72a16

  • Harden persistence and vcpkg pin synchronization 3a66693

  • Canonicalize complete vertex-cell incidence 52f9a58

  • Bound incidence fingerprint canonicalization 307737c

  • Harden experiment and repository validation fb7e5b3

  • Harden cross-platform validation 6b4d012

  • Pin Python for sanitizer bootstrap 9181494

  • Refresh portable Python package checks 96baa21

  • Preserve local runs when Comet mirroring fails 9cadfe7

  • Harden portable harness validation da7ba14

  • Select the root vcpkg manifest 1c064fd

  • Restore vcpkg binary caching 2b27462

  • Track canonical rendering fixture 7078f69

  • Harden archival rendering contract 81d366e

  • Harden transition and documentation validation e955ee6

  • Queue approved Dependabot updates for auto-merge e63e32f

  • Enforce v1.0.0 release gates 94ed107

  • Fail fast and support Dependabot coverage 2107f20

  • Stabilize macOS viewer and coverage gates deb24ab

  • Harden checkpoint resume contracts 17bb7fb

  • Enforce exact checkpoint continuation 95754c4

  • Harden repository readiness contracts 2840437

  • Preserve canonical producer paths on Windows 026ba3f

  • Harden boundary validation and diagnostics 38be43d

  • Preserve complete subprocess diagnostics 94a0c77

Maintenance

  • Gate automatic merges on CodeRabbit review 8124227

  • Bump the github-actions group with 4 updates #134 55d192d

  • Bump the github-actions group with 2 updates #136 90a3ea6

  • Automate vcpkg tool pin sync 9631335

  • Bump the dependencies group with 3 updates #144 098822d

  • Stagger Dependabot update schedules 9cf5b9d

  • Bump cryptography from 49.0.0 to 50.0.0 #146 e23d3c4

  • Bump taiki-e/install-action #152 426edb8

1.0.0-rc3 - 2026-07-28

Added

  • Restore optional parallel insertion and removal d4dabbe

  • Add value-oriented move-run orchestration abfa888

  • [breaking] Add invariant-bearing move preparation e2f7d70

  • [breaking] Modernize the CGAL 6.2 integration boundary ae7a39b

  • [breaking] Finalize parallel triangulation support 862637a

  • [breaking] Publish deterministic C++ oracle fixtures ec53dfa

Changed

  • [breaking] Normalize public declarations under cdt a02a732

  • Make MoveAlways replay checks deterministic d7fa637

  • Own move-run callbacks by value f59c06f

  • Make seeded replay fixtures cross-platform 3c322ee

  • Make producer path assertion cross-platform 390adf3

Fixed

  • Generate GCC 16 reports with LCOV 2.5 324a2aa

  • Install LCOV documentation dependencies 42fd262

  • Support pkgx-backed IDE environments 3ce8780

  • Retain function data during LCOV capture 898a453

  • Bound GCC branch inconsistencies c7d6a35

  • Keep oneTBB out of ThreadSanitizer 35b241e

  • Harden parallel build and provenance 6ef7dd6

  • Resolve pkgx certificate bundles before vcpkg a123ab8

  • Restore CodeQL extraction and bound parallel builds 56f13cd

  • Require fresh fixture provenance 6972970

  • Stabilize cross-platform validation b0c3169

  • Stabilize Windows and Semgrep validation b282c0b

  • Stabilize cached builds and action policy validation 930238a

  • Enforce action policy on nested paths 745d402

  • Enforce action policy on shorthand steps 406a482

Maintenance

  • Suppress ShellCheck for Zsh path expansion 189cc0d

  • Bump actions/checkout from 7.0.0 to 7.0.1 397e0b4

  • Bump taiki-e/install-action from 2.83.2 to 2.83.4 30c83fd

  • Bump github/codeql-action/init from 4.37.0 to 4.37.1 fd04186

  • Bump github/codeql-action/analyze from 4.37.0 to 4.37.1 16d8fcd

  • Enforce pkgx-first pinned toolchains f01fca6

  • Streamline and harden supported build workflows e29f69a

  • Update v1.0.0-rc3 release date e8f45ea

Performance

  • [breaking] Avoid rebuilding caches during move validation f574f0f

1.0.0-rc2 - 2026-07-22

Fixed

  • Verify Zenodo delivery for the current tag 05a6e97

1.0.0-rc1 - 2026-07-22

Added

  • Persist verifiable stochastic run provenance ce90551

Fixed

  • [breaking] Enforce atomic moves and validated runtime state #111 4245ac0

  • [breaking] Make Metropolis transitions reversible and reproducible #112 1d7269c

  • Harden optional Python experiment lifecycle #113 31f95ab

  • Enforce causal ergodic move contracts bb53988

  • Restore sanitizer and coverage reliability f4c7df9

  • Harden ergodic move rejection cec15b5

  • Make runtime configuration header self-contained cef03b5

Maintenance

  • [breaking] Consolidate develop into main #100 2459016

  • Align repository status reporting with main #109 c37fa09

  • Add release tooling and repair coverage 1416708

  • Update docs/RELEASING.md 26196da