test(mu4e-org-contacts): cover the completion-at-point and TAB dispatch logic

mu4e-org-contacts-integration.el had no tests. I added ten characterization tests for the completion glue. The capf only fires inside a header field of a compose buffer, so I check it both ways (wrong mode, wrong field) plus the bounds and table it returns when contacts exist and the empty-contacts case. TAB dispatches three ways depending on context, so each branch gets a test: completion-at-point in a header, org-cycle in the org-msg body, indent elsewhere. Comma completion and the direct-insert path round it out.

The header predicate, the mode actions, and cj/get-all-contact-emails are stubbed, so the run stays headless with no mu4e or org-contacts dependency.

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