fix: parse GitHub repo shorthand correctly

[OskarEichler]

Summary

• split repo: owner/name into the correct owner and repository fields
• add distinct owner/repository regression coverage

Why

The shorthand parser assigned the segment before / to repo and the segment after it to owner. Configurations only appeared correct when both names happened to be identical.

Tests

• TEST_FILES=githubPublishConfigTest corepack pnpm ci:test
• corepack pnpm compile
• corepack pnpm ci:validate
• git diff --check

Breaking changes

GitHub shorthand configurations now resolve to their intended repository instead of the reversed destination.

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Latest commit: f8c63b6

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