chore: bump go version to 1.26.4 (#10)

## Related Issue

None

## Summary

Bump go patch version. Upgrade xerrors to match.

chore(ci): excluded examples from coverage calculation (#9)

## Summary

Coveralls was considering the examples folder in the test coverage
calculation. This will ensure it is ignored.

## Test plan

- [x] `just test` passes
- [x] `just lint` passes
- [x] New behaviour is covered by tests.

chore: v1.0.0 prep (#8)

## Summary

- Add .golangci.yml mirroring xerrors linter config
- Add Example* functions for godoc across all packages
- Add examples/graceful-shutdown runnable program (Manager + ossignal +
poll)
- Add just example target
- Update SECURITY.md to reflect v1.x as the supported line
- Uncomment Release and Go Reference badges in README
- Add .gitignore

## Test plan

- [x] `just test` passes
- [x] `just lint` passes
- [x] New behaviour is covered by tests.

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>