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fix(ci): publish darwin-x86-64 (Intel macOS) — retire macos-13 + fix bun bootstrap

#205

Merged chrisbbreuer wants to merge fix/ci-macos13-retired-use-macos15-intel into main

7 files +427 -348

9f1f63526d fix(ci): macos-13 runner retired — use macos-15-intel for darwin-x86-64 Chris review this step
5a917bccc2 chore(ci): temp darwin-x86-64 bun diagnostics [skip-merge] Chris review this step
84a4d829b7 chore(ci): dump darwin-x86-64 bun file content for triage Chris review this step
335c8c3902 fix(ci): bootstrap upstream bun for darwin-x86-64 sync-prebuilt Chris review this step
e408765a78 fix(action): never let a registry stub clobber a real system binary Chris review this step