fix: preserve linker list operands with Zig 0.16

[messense]

Since 0.23.4, an existing filename passed as -Wl,<path> is rewritten as a positional input even when it is the operand of -exported_symbols_list. With Zig 0.16, an Apple cdylib link then fails with unable to read exported symbols list '-dead_strip': FileNotFound.

Preserve the following operand for the two list options already handled by the filter: -exported_symbols_list and --dynamic-list. Share filtering state between command-line arguments and response files, including pairs that cross a response-file boundary. A trailing response-file newline no longer consumes a pending operand. Older Zig versions still strip these list pairs, and the positional archive rewrite from #477 is preserved.

Replace the nonexistent filename in the existing Zig 0.16 unit test with a real file. Add executable-wrapper regression tests covering 106 argument scenarios: split and combined forms, old and new version gates, whole-archive inputs, subsequent argument filtering, UTF-16 response files, and pairs crossing response-file boundaries. Run the Rust test suite in the existing CI matrix. Correct the stale percent-escaping assertion exposed by running the suite on Windows, and run that pure string test on all hosts.

Validation on macOS with rustc 1.98.0:

• cargo test --locked --all-targets --all-features: 57 tests passed.
• cargo fmt --all -- --check and git diff --check: passed.
• cargo clippy --locked --all-targets --all-features: completed with five pre-existing warnings; strict -D warnings remains blocked by those warnings.
• A minimal Rust cdylib links, loads, and returns the expected value with Zig 0.16.0.
• Real Apple C links through direct, response-file, and split-boundary arguments match direct Zig's exported symbols.
• Real Linux ELF links with Zig 0.11.0 and 0.16.0 retain an otherwise unused archive symbol only when whole-archive is enabled, through both argument paths.

The executable-wrapper tests require Unix. They exercise Windows-target filtering and UTF-16 response files, but native Windows execution was not validated locally.

Fixes #479.