[codex] Update limonp dependency

[yanyiwu]

Summary

• update the bundled deps/limonp submodule from v1.0.2 (9d74077) to 4065c5f, which includes the LocalVector modernization from Modernize LocalVector helper limonp#44
• add an explicit <cassert> include in Unicode.hpp

Why

The modernized LocalVector.hpp no longer includes <assert.h> as an implementation detail. Unicode.hpp uses assert directly, so updating the submodule exposed an existing indirect-include dependency and caused the unit-test build to fail. Including <cassert> at the actual use site makes the dependency explicit.

Validation

• cmake -S . -B /tmp/cppjieba-limonp-build -DCMAKE_BUILD_TYPE=Release
• cmake --build /tmp/cppjieba-limonp-build --parallel 2
• ctest --test-dir /tmp/cppjieba-limonp-build --output-on-failure

Result: 2/2 CTest tests passed.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Avoid allocating for every DAG entry

With this submodule bump, limonp::LocalVector becomes a std::vector-backed wrapper with default capacity 0. In cppjieba, Trie::Find pushes at least one element into each Dag::nexts for every rune in the input, so the common single-candidate case now performs a heap allocation per character; the previous limonp version kept 16 inline slots and avoided those allocations. For normal Cut calls on long text this can regress the core segmentation hot path, so consider keeping small-vector storage for Dag::nexts or otherwise preallocating/using a different container before taking this update.

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