fix(ci): match engine's merge queue PR title prefix

[sileht]

The engine generates MQ draft PR titles as "merge queue: ..." (with a
space) but the detector checked for "merge-queue: " (with a hyphen),
so the merge queue base SHA override never fired.

Fixes MRGFY-6270

Co-Authored-By: Claude Opus 4.6 noreply@anthropic.com

[mergify]

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Pull request overview

This PR fixes a bug in the merge queue base SHA detection logic. The code was checking for PR titles starting with "merge-queue: " (with a hyphen), but the Mergify engine actually generates merge queue draft PR titles with "merge queue: " (with a space). This mismatch prevented the merge queue base SHA override from triggering.

Changes:

• Updated the title prefix check in detector.py from "merge-queue: " to "merge queue: "
• Updated the test case to use a more realistic merge queue title format that matches the actual engine output

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
mergify_cli/ci/git_refs/detector.py	Fixed the title prefix check from "merge-queue: " to "merge queue: " to match engine output
mergify_cli/tests/ci/git_refs/test_git_refs_detector.py	Updated test to use correct prefix and more realistic merge queue PR title

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Merge Queue Status

Rule: default

---

• ✅ Entered queue — 2026-02-19 13:55 UTC
• ✅ Checks passed · in-place
• ✅ Merged — 2026-02-19 13:56 UTC · at 7abf1b32b93143e20bceaf21186551c48b5543f5

This pull request spent 40 seconds in the queue, including 6 seconds running CI.

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• all of [🛡 Merge Protections rule Enforce conventional commit]:
  • title ~= ^(fix|feat|docs|style|refactor|perf|test|build|ci|chore|revert)(?:\(.+\))?:
    • fix(ci): match engine's merge queue PR title prefix #975
• all of [🛡 Merge Protections rule 👀 Review Requirements]:
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      • fix(ci): match engine's merge queue PR title prefix #975
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      • fix(ci): match engine's merge queue PR title prefix #975
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      • fix(ci): match engine's merge queue PR title prefix #975
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      • fix(ci): match engine's merge queue PR title prefix #975
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    • fix(ci): match engine's merge queue PR title prefix #975
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    • fix(ci): match engine's merge queue PR title prefix #975
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    • fix(ci): match engine's merge queue PR title prefix #975
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    • fix(ci): match engine's merge queue PR title prefix #975
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