test: compose YAML merge keys fixture

[FIERsity]

Compose backend regression lock: <<: *common anchors resolve (explicit keys win, both services inherit). Small fixture + integration test.

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📥 Commits

Reviewing files that changed from the base of the PR and between 1950f78 and 2cbaa81.

📒 Files selected for processing (2)

• tests/cli.rs
• tests/fixtures/merge-keys/compose.yaml

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