Add comprehensive test coverage for st.c (90.2%)

[Copilot]

Symbol table library src/st.c had only 12.9% test coverage. Added comprehensive tests to achieve 90.2% line coverage (248/275 lines).

Test Coverage Added

• Initialization: st_init_table, st_init_table_with_params, st_init_table_with_arg, st_init_table_with_params_and_arg
• Hash/Compare functions: st_numhash, st_ptrhash, st_strhash, st_numcmp, st_ptrcmp
• Lookup: st_lookup, st_lookup_int, st_find, st_is_member
• Modification: st_insert, st_add_direct, st_find_or_add, st_delete, st_delete_int
• Copy: st_copy (previously 0% coverage)
• Iteration: st_foreach with ST_CONTINUE/ST_STOP/ST_DELETE, st_gen, st_gen_int
• Edge cases: null value pointers, reorder_flag, rehash triggers, collision handling

TEST_CASE("st - st_foreach with ST_DELETE", "[st]") {
    st_table *tbl = st_init_table(st_numcmp, st_numhash);
    for (int i = 0; i < 10; i++) {
        st_insert(tbl, (void *)(intptr_t)i, (void *)(intptr_t)(i * 10));
    }
    
    int count = 0;
    int result = st_foreach(tbl, foreach_delete, &count);
    REQUIRE(result == 1);
    REQUIRE(st_count(tbl) == 0);  // All entries deleted
    st_free_table(tbl);
}

Remaining uncovered lines (~10%) are memory allocation failure paths requiring allocator mocking.

Warning

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I tried to connect to the following addresses, but was blocked by firewall rules:

• esm.ubuntu.com
  • Triggering command: /usr/lib/apt/methods/https /usr/lib/apt/methods/https -plugin-opt=-pass-through=-lgcc_s --build-id --eh-frame-hdr -m elf_x86_64 --hash-style=gnu --as-needed -dynamic-linker /lib64/ld-linux-x86-64.so.2 -pie -z (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

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Original prompt

Complete test cases for src/st.c and target 90% coverage for the source file.

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