fix: .tool-versions regex

[ronnnnn]

Overview

I had a mistake on #94.
We can't find bun's version correctly when .tool-versions have other versions begin "bun".

Reproduce steps

In .tool-versions:

bundler 1.0.0
bun     1.0.0

Regex check

https://regex101.com/r/2aCusB/3

[coderabbitai]

Walkthrough

Adjusted the .tool-versions reader regex in src/utils.ts to require at least one whitespace after bun and a non-space version token; removed an extra workflow step in .github/workflows/test.yml that previously wrote a duplicate .tool-versions entry.

Changes

Cohort / File(s)	Summary of Changes
Utils src/utils.ts	Tightened the .tool-versions reader regex from ^bun\s*(?<version>.*?)$/m to ^bun\s+(?<version>\S+)$/m, requiring at least one space after bun and a non-space version token (disallows empty or space-containing version capture). No API changes.
CI Workflow .github/workflows/test.yml	Removed an extra workflow step that wrote a duplicate/incorrect bun entry to .tool-versions, eliminating the generation of a bun1.1.0 line and leaving the intended entries only.

Pre-merge checks

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title Check	✅ Passed	The title "fix: .tool-versions regex" directly and accurately describes the main change in this pull request. The primary modification is updating the regex pattern used to parse the .tool-versions file to correctly handle cases where other tool names begin with "bun" (such as "bundler"). The title is concise, clear, and specific enough that a teammate scanning the history would immediately understand the core change being made.
Description Check	✅ Passed	The pull request description directly addresses the issue being fixed in the changeset. The author clearly explains that there was a problem from PR #94 where Bun's version cannot be correctly detected when .tool-versions contains other tools whose names begin with "bun" (such as "bundler"). The description provides a concrete reproduction case with specific examples and references a regex demonstration. This explanation directly relates to the regex change in src/utils.ts that tightens the matching pattern to require at least one whitespace after "bun" and a non-space version token, preventing false matches with other tool names.

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[coderabbitai]

Actionable comments posted: 1

📜 Review details

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📥 Commits

Reviewing files that changed from the base of the PR and between 6356405 and e5ed3e1.

⛔ Files ignored due to path filters (1)

• dist/setup/index.js is excluded by !**/dist/**

📒 Files selected for processing (1)

• src/utils.ts (1 hunks)

[xhyrom]

LGTM

[ronnnnn]

@xhyrom
Thank you for your review. I fixed the CI failure.

[coderabbitai]

Actionable comments posted: 1

📜 Review details

Configuration used: CodeRabbit UI

Review profile: ASSERTIVE

Plan: Pro

Disabled knowledge base sources:

• Linear integration is disabled by default for public repositories

You can enable these sources in your CodeRabbit configuration.

📥 Commits

Reviewing files that changed from the base of the PR and between e5ed3e1 and b08cdef.

⛔ Files ignored due to path filters (1)

• dist/setup/index.js is excluded by !**/dist/**

📒 Files selected for processing (1)

• src/utils.ts (1 hunks)

[ronnnnn]

this format is not supported on asdf