fix(language-bundle): don't re-drop the coverage fragment once adopted

The startup bundle sync re-dropped from-rulesets-coverage-makefile.txt into a project's inbox on every run, even after the project had adopted the targets. inbox_drop only treated the fragment as adopted if coverage-makefile.txt still sat at the project root or waited in the inbox. But install-lang tells users the opposite: copy the targets into your Makefile, then delete the fragment. So a project that followed the documented path got the drop re-suggested forever (deleted three sessions running in one case).

I guarded the drop so a project Makefile that already defines the distinctive coverage-summary target counts as adopted. The check lives at the call site, keeping inbox_drop generic. Added two bats cases: targets-in-Makefile suppresses the drop, an unrelated Makefile still gets it.

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