ami: TCP client with parser, list actions, ping and reconnect backoff

Parser tests replay a real Asterisk 24 session recorded byte for byte, in
every chunking from 1 byte up. Client tests use an in-process fake AMI.
Checked live against the container: login, command, hard kill rejects the
pending action, reconnect follows the 1/2/4/8/16/30 s backoff.

Task: M2-T1

apps/api/test/fixtures/ami/.gitattributes

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