plan(ssh): lock final decision — take ssh-config dep; no open questions remain

Resolve the last open question: take the ssh-config npm package (project-local,
alongside ssh2) for correct ~/.ssh/config parsing rather than hand-rolling.

§13 now lists all 8 decisions as resolved and marks the plan decision-complete.
Also records minor adopted defaults (config reader lives in ssh extension;
stale alias surfaced as unresolved not silent-local; default identity probing
order; assume unencrypted keys for MVP).

Planning document only; no code changed. No merge or push.

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