Add the Unix signal handling system call "sigaction" to the VSCode spell check dictionary to avoid false positives in technical documentation and code comments.

- Bump cc from 1.2.44 to 1.2.45
- Bump crc-fast from 1.6.0 to 1.7.0, removing rand and regex deps
- Bump jiff and jiff-static from 0.2.15 to 0.2.16, updating serde to serde_core
- Bump quote from 1.0.41 to 1.0.42
- Bump syn from 2.0.108 to 2.0.109
- Remove aho-corasick, regex, and related packages
- Update windows-sys to 0.60.2 and add nix dependency

These changes refresh dependencies for fuzzing components, potentially improving security and performance.

Previously, sigpipe_is_ignored() queried the signal handler on each call, which could be inefficient. Now, capture the state once at program initialization using platform-specific init arrays and store it in a static AtomicBool for fast access.

- Documents the safety invariants for the unsafe extern "C" function
- Ensures clarity on why the function is safe to call during process initialization
- Improves code maintainability and adheres to Rust documentation standards

Simplify code formatting by placing the 'ignored' variable assignment on a single line, improving readability without altering functionality.

…s_write_error

Remove the `concat!` macro from the script variable, as the string is short enough to be defined directly without concatenation. This improves code readability and reduces unnecessary macro usage.

- Combined multi-line string assignment and method chaining into single lines for conciseness and improved readability in test_sigpipe_ignored_reports_write_error.

Adjust error handling for BrokenPipe in seq to match GNU seq behavior:
- Exit with status 0 if SIGPIPE was not ignored (prints error message).
- Fail with error if SIGPIPE was explicitly ignored.

Balance error checking logic to consistently return errors for write failures, ensuring proper propagation without conditional SIGPIPE handling.