tecnickcom / gogen / 28865989235

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feat(timeutil): add sentinel errors, fix numeric overflow, handle JSON null, and implement text marshaling

- Add exported sentinel errors ErrInvalidDuration, ErrDurationOverflow, and ErrParseDateTime, wrapped at every error site so callers can branch with errors.Is.
- Fix Duration.UnmarshalJSON silently corrupting numeric values above MaxInt64: the float64 fallback now range-checks and returns ErrDurationOverflow instead of an implementation-defined garbage value.
- Treat JSON null as a no-op in Duration.UnmarshalJSON and DateTime.UnmarshalJSON, matching time.Time and preventing a single null field from aborting the whole document.
- Implement encoding.TextMarshaler/TextUnmarshaler on Duration and DateTime so both can be used as JSON map keys and with text-based encoders (YAML, TOML, flag.TextVar); note that map[Duration] JSON keys now serialize as human-readable strings (e.g. "1h30m0s") rather than nanoseconds.
- Replace (*new(T)).Format() with a named zero value in DateTime, extract Duration.fromNumber/fromString helpers, and delegate DateTime.UnmarshalJSON to UnmarshalText to keep the unmarshalers readable.
- Document fractional-nanosecond truncation, the UTC assumption for zone-less layouts, and null handling; list TDateTime and TJira in the package doc.

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