Release v1.5.4

fix: bump version to 1.5.4 (d8b5ff8)
address CodeRabbit review: export fallback constant, fix test hygiene (2685b97)
fix: bump version fallback to 1.18.3 to unblock Gemini 3.1 Pro (00e748a)
docs: add Invalid SemVer beta troubleshooting steps (bb069b9)

Update your opencode.json:

{
  "plugins": ["opencode-antigravity-auth@1.5.4"]
}

If stuck on an old version, clear the cache:

rm -rf ~/.cache/opencode/node_modules ~/.cache/opencode/bun.lock

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