Add missing thrust headers across C++ sources

[bdice]

Description

Fixes CI build failure where thrust::make_transform_output_iterator was not found in infeasibility_information.cu when building with CUDA 13.1.1 (CI log).

The codebase relied on transitive includes to resolve thrust symbols. This PR applies the Include What You Use (IWYU) principle: each of the 45 affected .cu/.cuh/.hpp files now directly includes the thrust headers for symbols it uses (transform_iterator.h, transform_output_iterator.h, zip_iterator.h, tuple.h, device_ptr.h, transform_reduce.h, extrema.h).

Issue

Closes #996

Checklist

• I am familiar with the Contributing Guidelines.
• Testing
  • New or existing tests cover these changes
  • Added tests
  • Created an issue to follow-up
  • NA
• Documentation
  • The documentation is up to date with these changes
  • Added new documentation
  • NA

[bdice]

Separately from this PR, cuOpt should move to using the newer fancy iterator classes from cuda:: instead of thrust::. We've been refactoring most of RAPIDS in this way. cuOpt should also adopt cuda::std::tuple and cuda::std::pair and other classes instead of their thrust:: counterparts.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: d509841b-c630-4d1b-99d1-052e31ec3d5a

📥 Commits

Reviewing files that changed from the base of the PR and between d80c581 and 56beb5c.

📒 Files selected for processing (1)

• cpp/CMakeLists.txt

---

📝 Walkthrough

Walkthrough

This PR adds missing Thrust header includes and a few SPDX year updates across many CUDA source and header files to restore direct dependencies (zip/transform iterators, tuple, extrema, transform_reduce, device_ptr, etc.). It also makes the cuopt_cli target PIE in CMake and updates a docs manifest entry. No runtime logic or public APIs were changed.

Changes

Cohort / File(s)	Summary
Barrier cpp/src/barrier/barrier.cu, cpp/src/barrier/iterative_refinement.hpp	Added Thrust iterator/algorithm headers (transform_iterator.h, zip_iterator.h, extrema.h).
MIP Heuristics — Feasibility Jump cpp/src/mip_heuristics/feasibility_jump/feasibility_jump.cu, .../feasibility_jump_kernels.cu, .../fj_cpu.cu	Added transform_iterator.h, tuple.h for transform/tuple utilities.
MIP Heuristics — Local Search / Rounding cpp/src/mip_heuristics/local_search/rounding/bounds_repair.cu, .../bounds_repair.cuh, .../constraint_prop.cu, .../lb_bounds_repair.cu	Added zip_iterator.h, tuple.h to satisfy zip-iterator and tuple usage.
MIP Heuristics — Presolve cpp/src/mip_heuristics/presolve/... (bounds_presolve.cu, conditional_bound_strengthening.cu, lb_probing_cache.cu, load_balanced_bounds_presolve.cu, .../load_balanced_bounds_presolve_helpers.cuh, multi_probe.cu, probing_cache.cu, trivial_presolve.cuh)	Added transform/zip iterator, tuple, extrema, and transform_reduce.h; one SPDX year update.
MIP Heuristics — Problem & Helpers cpp/src/mip_heuristics/problem/problem.cu, .../problem_helpers.cuh	Added transform_iterator.h, zip_iterator.h, transform_reduce.h, tuple.h.
MIP Heuristics — Solution cpp/src/mip_heuristics/solution/solution.cu	Added extrema.h for Thrust extrema usage.
PDLP — Core & Helpers cpp/src/pdlp/initial_scaling_strategy/initial_scaling.cu, cpp/src/pdlp/pdhg.cu, cpp/src/pdlp/pdlp.cu, cpp/src/pdlp/utils.cuh	Added transform_iterator.h and/or zip_iterator.h for iterator utilities.
PDLP — Strategies & Termination cpp/src/pdlp/restart_strategy/pdlp_restart_strategy.cu, .../adaptive_step_size_strategy.cu, .../convergence_information.cu, .../infeasibility_information.cu	Added device_ptr.h, extrema.h, iterator headers, transform_reduce.h, tuple.h (addresses missing transform_output_iterator and related utilities).
Routing — Local Search & Utilities cpp/src/routing/local_search/compute_compatible.cu, cpp/src/routing/utilities/check_input.cu	Added extrema.h, zip_iterator.h; SPDX year update in one file.
Routing — Route Headers cpp/src/routing/route/... (break_route.cuh, capacity_route.cuh, dimensions_route.cuh, distance_route.cuh, mismatch_route.cuh, pdp_route.cuh, prize_route.cuh, route.cuh, service_time_route.cuh, tasks_route.cuh, time_route.cuh, tsp_route.cuh, vehicle_fixed_cost_route.cuh)	Added tuple.h for thrust::tuple/tie/make_tuple; multiple SPDX year updates.
Routing — Solution Helpers cpp/src/routing/solution/route_node_map.cuh	Added tuple.h and updated SPDX year.
Utilities cpp/src/utilities/copy_helpers.hpp	Added zip_iterator.h for zip-iterator composition.
Docs manifest docs/cuopt/source/versions1.json	Updated preferred docs version from 26.04.00 → 26.06.00 and re-added 26.04.00 entry.
Build / CMake cpp/CMakeLists.txt	Enabled POSITION_INDEPENDENT_CODE for cuopt_cli and added -pie link option (produce PIE executable).

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 3 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Out of Scope Changes check	⚠️ Warning	Most changes are in-scope header additions following IWYU principles. However, the PR includes scope creep: updating copyright years (2025→2026) across multiple files and making CMakeLists.txt changes for position-independent code (PIE), which are unrelated to fixing missing Thrust headers.	Consider separating copyright year updates and CMakeLists.txt PIE changes into separate PRs to maintain focus on the specific issue of missing Thrust headers.
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Add missing thrust headers across C++ sources' accurately describes the main change: adding explicit Thrust header includes across multiple C++ files to fix a CI build failure and follow IWYU principles.
Description check	✅ Passed	The description clearly explains the fix for CI build failure in CUDA 13.1.1, identifies the root cause (transitive includes), and describes the solution (adding explicit Thrust header includes across 45 files following IWYU principles).
Linked Issues check	✅ Passed	The PR directly addresses issue #996 by adding explicit Thrust header includes across all affected files, resolving the namespace resolution error for thrust::make_transform_output_iterator and other symbols that were previously available through transitive includes.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[mlubin]

Is this change intended? Seems unrelated and I don't know what this json conf does

[rgsl888prabhu]

This is used for switching docs from one release version to another. Somehow, it was missed or this branch was outdated in some way. And check style ensures all these versions are upto-date per release version.

[bdice]

This was required by cuOpt's pre-commit hooks. Without this, the style checks failed on main.

I would have expected main to already contain these changes, since #975 bumped VERSION to 26.06.00.

Perhaps developers are still targeting release/26.04 and haven't noticed that main has been broken?

[vyasr]

Approving the switch of cuopt_cli to compiling with position independent code.

[rgsl888prabhu]

/merge