Bump version to v0.3.0 for release

[ChrisRackauckas-Claude]

Summary

• Bump version from v0.2.2 to v0.3.0

This release includes 29 commits since v0.2.2 (March 2022):

• Apply JuliaFormatter to codebase
• Add downgrade CI workflow
• Add .typos.toml configuration + SpellCheck.yml workflow
• Update GitHub Actions (codecov-action, setup-julia, checkout, cache)
• Enable dependabot for GitHub actions
• Various CI improvements

Registration

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Closes #61

cc @ChrisRackauckas

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[ChrisRackauckas-Claude]

CI Failures Analysis

The CI failures in this PR are pre-existing issues on master, not caused by the version bump. The same failures occur on the CI Health Check run against master.

Issues Found:

1. Julia 1 (latest/1.12) tests fail - The package has outdated compat bounds from 2022:

   • CUDA = "3" - but CUDA 3.x is incompatible with Julia 1.12
   • Flux = "0.12, 0.13" - only supports old Flux versions
   • NNlib = "0.8" - outdated
   • OMEinsum = "0.6" - outdated

   Julia 1.6 tests pass - the minimum supported version still works.

2. Spell Check fails - Pre-existing typos in the codebase:

   • ouptut → output in src/FourierLayer.jl:28
   • Missings in docs/Manifest.toml

3. Downgrade CI fails - Cannot resolve with minimum dependency versions due to incompatible compat bounds.

Recommendation

The version bump (0.2.2 → 0.3.0) itself is correct. The compat bounds should be updated in a separate PR after this release to support newer Julia versions.

cc @ChrisRackauckas