Commit 2026-05-31 20:29 b912e1fc

feat(CI): validate PR titles more strictly (#39680)

• lint extraneous spaces (and any tabs)
• check that PR scopes are well-formed
• also extract the PR subject, and check that it does not end in a period, and starts in lower-case
• linter about strange Unicode characters (anything not allowed by the Unicode linter) Continuation of #34518: this covers the remaining checks of #16303. (This does not check that the subject is in imperative, present tense.)