chore: release main

[StefanSteiner]

🤖 I have created a release beep boop

0.3.0

0.3.0 (2026-05-29)

⚠ BREAKING CHANGES

• v0.3.0 reshapes the public hyperdb_api::Error enum into a flat canonical structure (no Box cause channel, no kind() method, no Other catch-all variant), and its constructor surface (Error::new and Error::with_cause are deleted in favor of domain-specific snake_case constructors). It also changes the FromRow trait signature from fn from_row(row: &Row) to fn from_row(row: RowAccessor<'_>), deletes the blanket 1/2/3/4-tuple FromRow impls, deprecates Connection::begin_transaction/commit/rollback (use the RAII guard at Connection::transaction() instead), introduces a new Error::InvalidOperation variant, and changes Error::Cancelled and Error::Closed from tuple to struct variants carrying structured sqlstate. Every variant has a snake_case constructor; the FromRow derive lives in a re-exported hyperdb-api-derive crate. See MIGRATING-0.3.md for migration recipes.

Features

• stabilize v0.3.0 public API bundle (#77) (ac39b2c)

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