Fix non-ASCII hyphens in Dependabot signature in commitlint config

[coderabbitai]

Issue

In the newly added commitlint.config.mjs file, the Dependabot signature check uses non-ASCII hyphens (U+2011) in the string literal:

(message) => message.includes("Signed‑off‑by: dependabot[bot]")

This won't match the standard ASCII hyphen that is used in actual Dependabot commit signatures.

Solution

Replace the string check with a regular expression that matches standard ASCII hyphens:

(message) => /Signed-off-by: dependabot\[bot\]/.test(message)

References

• Identified in PR review: chore(ci): add commitlint config rules #225 (comment)