Librage/feat/20260720114443

[mroczect]

Summary

This PR delivers librage v1.1.0 — a ground‑up rewrite that introduces:

• Uniform LibrageResponse<T> return type for all public functions
• Streaming encryption & decryption (encrypt_stream, decrypt_stream, etc.)
• Tag (encrypt_with_tag) and TagPQ (encrypt_with_tagpq) recipients
• Multiple recipients with armour support (encrypt_multiple_armored)
• Multi‑line SSH key handling in read_identities_from_file
• Extended error codes (NoMatchingKeys, MissingRecipients, ExcessiveWork, etc.)
• Modern CI pipeline (fmt, clippy, docs, test matrix)
• 100+ new tests

Breaking Changes

• Every function now returns LibrageResponse<T> instead of Result.
• armor module removed – use encrypt_armored / decrypt_armored directly.
• generate_keypair_json removed – use generate_keypair().to_json().
• ssh_to_age_key placeholder removed.
• Removed old flag‑based armour functions.
• Minimum Rust version is now 1.85.

New Features

Feature	Functions
Streaming	encrypt_stream, encrypt_stream_armored, decrypt_stream, decrypt_stream_with_identities
Tag recipients	encrypt_with_tag
TagPQ recipients	encrypt_with_tagpq
Multiple + armour	encrypt_multiple_armored
Identity file aliases	read_identity_file, read_identity_file_with_passphrase

Testing

cargo fmt --all
cargo clippy -- -D warnings
cargo test
# All 101 tests pass, 0 warnings