CLI changelog

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Added

• Loads native shipd.config.go flag definitions directly, without a JSON export.
• shipd pull preserves the Go source format.
• shipd types gen --language go generates Go accessors, variant constants, and defaults. Go input selects Go output by default after push and pull, unless typesLanguage overrides it.
• shipd pull writes gofmt-clean Go. When generating Go accessors, it checks that every flag key becomes a valid, unique Go identifier before writing anything. Non-ASCII keys produce distinct exported identifiers.
• Loading shipd.config.go without Go installed explains how to install it, and compiler errors point at shipd.config.go.