chore: switch to a stable 0.1.0 release line and pin the 0.x major

[OmarAlJarrah]

Summary

Graduates kuri out of the 0.1.0-alpha.N prerelease series onto a stable 0.x line, and configures release automation so the major digit stays at 0 until a deliberate 1.0.0.

• Version state. gradle.properties and .release-please-manifest.json now record 0.1.0 (was 0.1.0-alpha.4).

• Release config. Removes the prerelease settings from release-please-config.json (prerelease, prerelease-type, versioning), so release-please cuts plain 0.y.z releases instead of advancing an alpha counter. The pre-major settings are kept and are what pins the line at 0.y.z:

  • bump-minor-pre-major → breaking changes bump the minor (0.1.0 → 0.2.0), never 1.0.0.
  • bump-patch-for-minor-pre-major → feat and fix bump the patch (0.1.0 → 0.1.1).

  The automation therefore never crosses to 1.0.0 on its own; reaching 1.0.0 is a deliberate manual Release-As: 1.0.0.

• Docs. README install snippets, coordinate table, Kuri.VERSION example and the stability note now read 0.1.0 and describe the 0.x series rather than an alpha one. RELEASING.md replaces the alpha-cadence and initial-alpha-publish sections with the 0.x cadence, the 1.0.0 graduation path, and a generic "bootstrap a version with no prior tag" runbook. Kuri.kt's version KDoc example is updated.

Publishing note

0.1.0 has no prior git tag, so — exactly like the first alpha did — it must be published once via the manual Actions → Publish → Run workflow dispatch (which creates the v0.1.0 tag and GitHub Release). After that, merging release-please's release PRs publishes automatically.

This change is intentionally a chore: so graduating the version does not itself trigger a release-please bump.

Supersedes

Folds in and replaces two open docs PRs, whose changes are incorporated here retargeted to 0.1.0:

• docs: bump README install snippets to the current release version #151 (README install snippets → version bump) — superseded; snippets now point at 0.1.0.
• docs: de-hardcode the initial-publish section in RELEASING.md #145 (de-hardcode RELEASING.md's initial-publish section) — superseded; its generic "no prior tag" runbook is incorporated into the reworked RELEASING.md.

Closes #94
Closes #99