v1.16.0 (2026-09-17)

Changes:

- Add package oblast.
  This used to live at <https://git.xyrillian.de/go-oblast/>, but for the 1.x series,
  I'm moving nearly everything from `go.xyrillian.de/oblast` to `go.xyrillian.de/gg/oblast` because removing the module boundary
  between gsql and oblast opens up some code reuse opportunities and may help future optimizations.
  The only API surface that remains in the old location for now is `type RuntimeIndex`, because I want to contemplate method naming once again before stabilizing it.
- gsql: Add NoneIfNoRows.
  This replaces "OrNone" variants of methods in Oblast, e.g. SelectOne() and then also SelectOneOrNone().
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