chore(main): release git-metadata 0.3.0-rc.2

[git-quickbeam]

Release Notes

0.3.0-rc.2 (2026-05-08)

Features

• Accept optional author signature in Ledger::create (cb4d735), closes #10
• Add --author-name and --author-email to create subcommand (cb4d735)
• Add ContentAddressable and Pointer traits (677936a)
• Add Error::UnexpectedKind variant (d57c2ba)
• Add Tx::with_message() builder; default commit message is "store: commit transaction" (d57c2ba)
• Add FileMode enum (Blob, Executable, Tree, Commit) (c72b96c)
• Add git-db crate to workspace (e2ed0fc)
• Add IdStrategy::CommitOid for commit-OID-keyed entity refs (31c8dc3), closes #6
• Add Mutation::Pin for inserting entries that reference existing objects (c72b96c)
• Add optional author override to Ledger::create (cb4d735)
• Add store abstractions (260820f)
• Enable gix tree-editor feature for structural sharing (bf946a9)
• Implement ContentAddressable, Ref, and Transaction over gix (7949943)
• Implement Store and Tx for phase 1 transaction (bf946a9)
• Read committer identity from git config via repo.committer(), falling back to generic defaults (d57c2ba)
• Scaffolding for git-store (4480796)
• Split Pointer into Ref and Transaction traits (7ff0b5f)
• Store::open/init bind to refs/db/<n> (bf946a9)
• Tx::commit with configurable CAS retry loop (bf946a9)
• Tx::get/put/delete/list over nested tree paths (bf946a9)

Bug Fixes

• Publish only the crate matching the release tag (912b8ce)
• Publish pre-release crates to crates.io (6f1d588)
• Reject empty paths in Tx operations (f541852)
• Remove manual version pins (ed13199)
• Replace panicking into_commit()/into_tree() with try_into_commit()/try_into_tree(), returning Error::UnexpectedKind on mismatch (d57c2ba)

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