Add SHA-256 and raw SSH host key inspection#104
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Raise the libssh2 build floor to 1.9.0 so every successful build exposes the complete host-key API, and fail configuration clearly when headers and the linked library do not match.\n\nAdd SHA-256 fingerprint selection, raw negotiated host-key retrieval, and constants for the supported host-key types. Preserve the existing MD5 default and SHA-1 behavior.\n\nCover the new surface with an algorithm-independent PHPT that verifies the raw key and SHA-256 fingerprint describe the same negotiated server key.
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Summary
Why
The extension currently exposes only MD5 and SHA-1 fingerprints. Applications implementing modern known-hosts or trust-on-first-use storage cannot retrieve the negotiated key bytes or algorithm.
libssh2 1.9.0 is the first release with the complete SHA-256 and host-key type surface used here. Configure failures now identify mismatched headers and libraries instead of silently building a reduced API.
Testing