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Package atomicwrite provides a POSIX-atomic file writer: data is written to a temp file in the target's directory, fsync'd, then renamed over the target.

Package edit provides the in-memory round-trip edit primitives Båge applies before any file write: drift classification (two hashes), a pure byte-range splice over a single file's bytes, a byte-offset → row/col point helper, and a reparse that prefers incremental parsing for the single-region path.

Package format defines the formatter and linter ports applied to staged edit content before it is committed, together with configured-command exec adapters and in-memory fakes for downstream tests.

Package hashing defines the Hasher port and the raw/normalized content-hash helpers Båge uses for drift discipline (SPEC §4.3).

Package locator addresses byte regions of files and applies splice edits to them.

Package lsp bridges an LSP server's symbol operations to Båge's byte-range edit model.

Package normalize provides the shared content-normalization rule used to compute Båge's normalized content hash.

Package parser defines the engine-agnostic parsing port and the concrete syntax tree (CST) data-transfer objects Båge uses to locate byte ranges.

Package treesitter implements parser.ParserPort with the official CGO go-tree-sitter bindings (docs/adr/0002).

Package region defines Båge's region-anchoring primitives: the content-anchored edit unit (SPEC §8) and the concurrency-safe resolver that maps a possibly-stale region back onto the live file (ADR-0003).

Package session implements Båge's FILE-LEG two-phase, region-anchored, concurrency-safe edit protocol (SPEC §8, ADR-0003).

Package wal is a durable, file-based write-ahead log of edit intents.