- client_cli: capture errno before output_escape() in
read_patterns_from_file() so an over-long line is still reported as
EFBIG instead of the (possibly malloc-clobbered) errno.
- file_list: guard string_list_add() capacity doubling against
overflow (capacity > INT_MAX / 2), matching filter_rule_list_add();
callers already surface the false as a memory-allocation error.
- compression: ZSTD_isError() is true for ZSTD_CONTENTSIZE_UNKNOWN,
which made the 3x unknown-size fallback dead code. Test the
CONTENTSIZE_ERROR/UNKNOWN sentinels explicitly so unknown-size frames
reach the estimate path (still bounded by the existing hard limit)
while invalid frames are rejected. Known-size frames and the 100 MB
ceiling/overflow checks are unchanged.
- tests: add an unknown-content-size-frame decompression test.
Tests: ./build/tests and ./build-asan/tests all pass (42/42);
clang-format + cppcheck clean.
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