Expand create parity support

[mjc]

Summary

• add create parity audit coverage for p7zip compression knobs, split volumes, and link behavior
• add public compression, streaming spool, split volume, and symlink metadata APIs
• wire compression knobs into LZMA/LZMA2 encoding and document limitations around hard links and split-volume reads

Verification

• cargo fmt
• git diff --check
• cargo test
• nix-shell -p p7zip --run "cargo test interop"
• nix-shell -p p7zip --run "cargo test create_parity"

[Copilot]

Pull request overview

This PR expands r7z’s “create parity” with p7zip by introducing a new writer implementation and public option types (compression tuning, streaming spool, split volumes, encryption, and symlink metadata), and by extending interop/audit tests to validate the behavior against p7zip.

Changes:

• Replace the old builder/writer implementation with a new write module that supports codecs, header modes, encryption, solid modes, streaming/spooling, and split volumes.
• Extend archive reading APIs with seek-backed open modes, metadata limits, and symlink metadata helpers.
• Add/expand tests and benches covering p7zip create-parity, streaming, metadata, encryption, split volumes, and file-backed open behavior.

Reviewed changes

Copilot reviewed 24 out of 24 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/support/mod.rs	Disable clippy pedantic for shared test support.
tests/read_parity_test.rs	Disable clippy pedantic for parity tests.
tests/p7zip_extract_parity_test.rs	Update tests for new writer/builder options + ArchiveWriter::new(out, options) signature.
tests/lzma_perf_test.rs	Disable clippy pedantic for perf test.
tests/interop_write_test.rs	Large interop expansion: metadata, header modes, encryption, streaming, split volumes, symlink behavior.
tests/interop_test.rs	Disable clippy pedantic for interop tests.
tests/file_backed_open_test.rs	New tests for seek-backed open, metadata limits, and bounded extraction behavior.
tests/create_parity_audit_test.rs	New p7zip create-parity audit coverage for compression knobs, split volumes, and link behavior.
src/write/model.rs	New public option/model types (ArchiveOptions, CompressionOptions, EntryMeta, etc.).
src/write/mod.rs	New builder/writer implementation + streaming/spooling/volumes entrypoints.
src/write/header.rs	New header encoding (files info + metadata properties).
src/write/encode.rs	Archive encoding, option validation, encryption wrapping, LZMA/LZMA2 tuning.
src/lib.rs	Public API re-exports updated; new open options + write APIs exposed.
src/files_info.rs	Add ctime/atime/start_pos fields + EntryType and symlink classification; refactor property parsing.
src/error.rs	Add InvalidOptions and LimitExceeded error variants.
src/codec.rs	Add size-aware decompression chain API and AES truncation support.
src/builder.rs	Remove legacy builder/writer implementation.
src/bin/build_n64.rs	Update docs to reflect new creation approach.
src/bcj.rs	Add streaming BCJ writer + tests for streaming vs batch equivalence.
src/archive.rs	Add seek-backed storage mode + metadata limits; refactor to ArchiveSource for ranged reads.
src/aes.rs	Add AES property encoding + AES-CBC encryption helper; small doc updates.
benches/parse_bench.rs	Add benchmarks for seek vs mmap open + extraction; create sparse fixture.
README.md	Update docs for new APIs/options, seek-backed open, encryption, volumes, metadata, link semantics.
Cargo.toml	Add getrandom dependency for writer/encryption/spooling.

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