Add explicit includes for transitively-used std headers

[zzcgumn]

Summary

• A Copilot review on dds_c_api_test.cpp flagged std::snprintf used without including <cstdio> (only <cstring> was present) — fixed.
• Swept the rest of the project's own sources with clang-tidy's misc-include-cleaner check (via the repo's compile_commands.json) to find other symbols relied on only through transitive includes.
• Findings were filtered to genuine standard-library headers only, excluding project facade headers (e.g. api/dll.h, utility/constants.h) that are intentionally re-exported by dds_c_api.h and friends.
• Purely additive; no behavior changes — 58 files touched, 107 lines added, 0 removed.

Test plan

• bazel build //... — all 186 targets build clean
• bazel test //... — all 86 tests pass

🤖 Generated with Claude Code

closes #329

[Copilot]

Pull request overview

Adds explicit standard-library includes across DDS core, tests, utilities, Python bindings, and benchmarks, including the missing <cstdio> for std::snprintf.

Changes:

• Adds missing standard headers to 58 C++ sources.
• Covers core solver, transposition tables, system utilities, tests, bindings, and benchmarks.
• No runtime behavior changes; build and test results are reported clean.

Reviewed changes

Copilot reviewed 58 out of 58 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
utilities/tests/dd_table_for_deal_test.cpp	Updated as part of this pull request.
utilities/src/dd_table_for_deal/dd_table_for_deal_lib.cpp	Updated as part of this pull request.
python/src/converters.cpp	Updated as part of this pull request.
python/src/bindings.cpp	Updated as part of this pull request.
library/tests/trans_table/trans_table_s_test.cpp	Updated as part of this pull request.
library/tests/trans_table/trans_table_l_test.cpp	Updated as part of this pull request.
library/tests/trans_table/trans_table_base_test.cpp	Updated as part of this pull request.
library/tests/trans_table/test_utilities.cpp	Updated as part of this pull request.
library/tests/trans_table/mock_data_generators.cpp	Updated as part of this pull request.
library/tests/TestTimer.cpp	Updated as part of this pull request.
library/tests/testcommon.cpp	Updated as part of this pull request.
library/tests/test_timer_test.cpp	Updated as part of this pull request.
library/tests/system/parallel_boards_test.cpp	Updated as part of this pull request.
library/tests/solve_board/analyse_play_consistency.cpp	Updated as part of this pull request.
library/tests/report_board_timings.cpp	Updated as part of this pull request.
library/tests/report_board_timings_test.cpp	Updated as part of this pull request.
library/tests/regression/heuristic_sorting/heuristic_sorting_test.cpp	Updated as part of this pull request.
library/tests/print.cpp	Updated as part of this pull request.
library/tests/parse.cpp	Updated as part of this pull request.
library/tests/moves/moves_test.cpp	Updated as part of this pull request.
library/tests/loop.cpp	Updated as part of this pull request.
library/tests/loop_par_test.cpp	Updated as part of this pull request.
library/tests/heuristic_sorting/test_utils.cpp	Updated as part of this pull request.
library/tests/heuristic_sorting/minimal_weight_test.cpp	Updated as part of this pull request.
library/tests/dtest.cpp	Updated as part of this pull request.
library/tests/dtest_parallel.cpp	Updated as part of this pull request.
library/tests/dds_c_api_test.cpp	Updated as part of this pull request.
library/tests/args.cpp	Updated as part of this pull request.
library/tests/args_test.cpp	Updated as part of this pull request.
library/tests/ab_search/tt_lookup_test.cpp	Updated as part of this pull request.
library/tests/ab_search/make3_test.cpp	Updated as part of this pull request.
library/src/trans_table/trans_table_s.cpp	Updated as part of this pull request.
library/src/trans_table/trans_table_l.cpp	Updated as part of this pull request.
library/src/system/timer.cpp	Updated as part of this pull request.
library/src/system/timer_list.cpp	Updated as part of this pull request.
library/src/system/timer_group.cpp	Updated as part of this pull request.
library/src/system/time_stat.cpp	Updated as part of this pull request.
library/src/system/thread_mgr.cpp	Updated as part of this pull request.
library/src/system/thread_data.cpp	Updated as part of this pull request.
library/src/system/system.cpp	Updated as part of this pull request.
library/src/system/scheduler.cpp	Updated as part of this pull request.
library/src/system/parallel_boards.cpp	Updated as part of this pull request.
library/src/system/memory.cpp	Updated as part of this pull request.
library/src/system/file.cpp	Updated as part of this pull request.
library/src/solver_if.cpp	Updated as part of this pull request.
library/src/solver_context/solver_context.cpp	Updated as part of this pull request.
library/src/solve_board.cpp	Updated as part of this pull request.
library/src/play_analyser.cpp	Updated as part of this pull request.
library/src/later_tricks.cpp	Updated as part of this pull request.
library/src/init.cpp	Updated as part of this pull request.
library/src/dump.cpp	Updated as part of this pull request.
library/src/dds_api.cpp	Updated as part of this pull request.
library/src/ab_stats.cpp	Updated as part of this pull request.
library/src/ab_search.cpp	Updated as part of this pull request.
benchmarks/warm_tt_benchmark.cpp	Updated as part of this pull request.
benchmarks/replay.cpp	Updated as part of this pull request.
benchmarks/recording.cpp	Updated as part of this pull request.
benchmarks/dds_replay_main.cpp	Updated as part of this pull request.

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