[codex] Update cppjieba submodule

[yanyiwu]

Summary

Update submodules/cppjieba from b3602bef to 3503cb3b.

This brings in the current limonp LocalVector compatibility wrapper, the explicit <cassert> dependency fix, Bazel smoke coverage, and the latest cppjieba CI/test updates.

Validation

Run from an in-repository build directory because the existing tests use relative source paths:

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

Result: 2/2 tests passed.

[jingmin111]

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Preserve LocalVector's small-buffer behavior

When simhash segments any non-empty document, cppjieba's Trie::Find builds one Dag per rune and immediately appends to Dag::nexts; this submodule revision pulls in limonp 4065c5f, where LocalVector is now a plain std::vector with no inline capacity. That turns the first append for almost every character into a heap allocation instead of using the previous 16-element stack buffer, so common make()/extract() calls allocate O(text length) more and can significantly slow large-document processing. Please keep the old small-buffer behavior or reserve/replace this hot-path container before bumping cppjieba.

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