Accepted the manager's own refusal of a host-held port in the e2e test

[acburdine]

The manager now asks the host, through host.docker.internal, whether a requested --port is held by a program Docker does not manage, and refuses it before writing anything. On OrbStack and Docker Desktop that refusal comes first, so the "A port held by a program Docker does not manage" step in tests/e2e/install.sh failed on its first check, which expected Docker's bind error.

The step now accepts either refusal:

• where the manager can see the host's ports (OrbStack, Docker Desktop): already in use on this host by something outside Docker, --port, Nothing has been changed
• on Linux: Docker's bind error naming 127.0.0.1:<port>, already (in use|allocated), choose another for Ghost with --port, Nothing that was already running was stopped

Both still check that the directory is empty, no containers are left, the holder is alive, and a free --port succeeds. The Linux branch now checks the whole choose another for Ghost with --port phrase; a stray -- argument had made it match any -- in the output.

shellcheck tests/e2e/install.sh passes. The e2e script has not been run on this branch yet.

🤖 Generated with Claude Code

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