Upgrades oliphant from v0.1.0 to v0.2.0 and turns on sqlc fmt for the postgresql engine.

What's in oliphant 0.2.0

The release adds parser.ParseFile, which returns the parse tree together with the comment tokens the scanner already produces — from the same pass the parse makes over the input. That is exactly the contract sqlc fmt requires from an engine: statements and comments in one lexer pass, positioned in the same byte offsets the tree's location fields carry.

Changes

• internal/engine/postgresql/parse.go: the PostgreSQL parser now implements ParseFile(io.Reader) (*ast.File, error), mirroring the SQLite engine's meyer-based template. oliphant's comment tokens become ast.Comment values (text, byte offsets, own-line flag), and the existing statement-span conventions — leading comments covered, pre-PG18 location semantics — are untouched. Parse now delegates to ParseFile.
• internal/cmd/fmt.go: newQueryFormatter returns the PostgreSQL parser for postgresql configs. The engine already implemented format.Dialect, so ParseFile was the only missing piece.
• Fingerprint belt: PostgreSQL brings a proof the other engines cannot offer — oliphant's pg_query-compatible fingerprint. fmt now recognizes an optional fingerprinter interface: where an engine implements Fingerprint, a formatted statement is only accepted when its fingerprint matches the original's, and falls back to the text as written otherwise. This sits on top of the existing reparse / comment-multiset / fixed-point checks and makes the documented "proven to survive formatting unchanged" contract literal for PostgreSQL.
• Test data: the fmt/postgresql end-to-end case drops its "does not yet support the postgresql engine" stderr.txt; stdout.txt now commits the real fmt --diff golden output. Trailing and interior comments stay anchored (-- the primary lookup stays on the LIMIT 1; line, -- the primary key stays with its select-list item), and the deliberately long one-line SearchAuthors stays on one line, gofmt-style.

Testing

• TestReplay/base/fmt/{postgresql,mysql,sqlite} pass.
• TestFormat passes — it round-trips every PostgreSQL testdata case through the printer and compares pg_query fingerprints.
• Full go test --tags=examples -timeout 20m ./... passes against live PostgreSQL and MySQL.

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