fix: repair bcos formula test block

[pengshenghai]

Summary

• replace the unsupported write_file call in the BCOS formula test block with Pathname#write
• remove || true from test commands so brew test does not mask failures
• compare the CLI version output with version.to_s instead of hard-coding 1.8.0

Scope

This only changes Formula/bcos.rb test-block behavior. It does not alter the tarball URL, SHA, install block, package source, or formula metadata.

Validation

• ruby -c Formula/bcos.rb -> Syntax OK
• git diff --check -- Formula/bcos.rb -> passed (Windows line-ending warning only)

I could not run brew test in this Windows workspace because Homebrew is not installed here.

AI assistance

Implemented with OpenAI Codex assistance after reading issue #8 and the current formula.

[Scottcjn]

Received, and queued for review — apologies for the silence up to now.

This is a maintainer-side backlog rather than any verdict on your contribution. We
had a large number of open PRs with no reply on them at all, which is our failure to
manage, not a signal about your work. Yours is in the queue and will get a real
review with a real decision.

I'm not going to give you a date I might miss. What I can tell you:

• Reviews run oldest-first.
• If this PR has gone stale against main, say so and I'll prioritise closing it so
  the queue reflects what you actually still want landed.
• If you're submitting this for bounty credit, link the bounty issue in a comment —
  several contributions are eligible and we'd rather pay you than have you wonder.

Thanks for your patience, and for the work.

[Scottcjn]

Reviewed and merging — sorry it sat 66 days, that's on us. Verified by reading the diff: this removes the || true that made the bcos --help and bcos scan test assertions unable to fail (a test that can't fail is worse than no test), replaces the hardcoded "1.8.0" with version.to_s so the version assertion tracks the formula, and swaps the non-DSL write_file for (testpath/...).write. All three are correct and the change is scoped to the test block. Thank you.

[Scottcjn]

Correction: I went to merge and it has conflicts — the formula drifted in the 66 days this sat. The change itself is still correct and approved; it just needs a rebase onto current main first. @pengshenghai if you can rebase, we'll merge it right after. Apologies again for the wait.