Plan B Phase 7 sub-step 2 — moves the bodies of parse_month_year,
base32_decode_lenient, guess_mime from crates/relicario-cli/src/parse.rs
to relicario-core. The CLI's parse.rs becomes a 19-line shim re-exporting
the new core API.
New core surface:
- time::MonthYear::parse (Result<_, RelicarioError>)
- mime::guess_for_extension (new mime module)
- item_types::TotpConfig::parse_secret — Zeroizing<Vec<u8>> wrapper
over base32::decode_rfc4648_lenient
base32 module promoted from pub(crate) to pub so non-core consumers
(CLI shim, future Phase 8 WASM exports) can reach it. New
RelicarioError::InvalidMonthYear(String) for the parse error path
(mirrors sub-step 1's InvalidBase32). MonthYear::new keeps its
&'static str error type — bringing it to RelicarioError is DEV-A's P3.
CLI callsites unchanged (commands/{add,edit,attach}.rs); RelicarioError
auto-converts to anyhow::Error at ? boundaries.
cargo test --workspace: green (core 143, +7 from new tests)
cargo clippy --workspace: silent
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
